MAXIM MAX9888 Technical data

19-5235; Rev 1; 2/11

with FlexSound Technology

General Description

The MAX9888 is a full-featured audio CODEC whose
high performance and low power consumption make it
ideal for portable applications.

Class D speaker amplifiers provide efficient amplification
for two speakers. Low radiated emissions enable com­pletely filterless operation. Integrated bypass switches
optionally connect an external amplifier to the transducer
when the Class D amplifiers are disabled.

®

DirectDrive
ground-referenced output, eliminating the need for
large DC-blocking capacitors. 1.8V headphone opera­tion ensures low power consumption. The device also
includes a differential receiver amplifier.

Three differential analog microphone inputs are available
as well as support for two PDM digital microphones.
Integrated switches allow microphone signals to be
routed out to external devices. Two flexible single-ended
or differential line inputs may be connected to an FM
radio or other sources.

Integrated FlexSoundK technology improves loud­speaker performance by optimizing the signal level and
frequency response while limiting the maximum distor­tion and power at the output to prevent speaker damage.
Automatic gain control (AGC) and a noise gate optimize
the signal level of microphone input signals to make best
use of the ADC dynamic range.

The device is fully specified over the -40NC to +85NC
extended temperature range.

DirectDrive is a registered trademark and FlexSound is a
trademark of Maxim Integrated Products, Inc.

headphone amplifiers provide a true

Stereo Audio CODEC

Features

S 100dB DR Stereo DAC (8kHz < fS < 96kHz)

91dB DR Stereo ADC (8kHz < f

S

Stereo Low EMI Class D Amplifiers

S

950mW/Channel (8I, V

Stereo DirectDrive Headphone Amplifiers

S

Differential Receiver Amplifier

S

2 Stereo Single-Ended/Mono Differential Line

S

Inputs

3 Differential Microphone Inputs

S

FlexSound Technology

S

5-Band Parametric EQ
Automatic Level Control (ALC)
Excursion Limiter
Speaker Power Limiter
Speaker Distortion Limiter
Microphone Automatic Gain Control
and Noise Gate

Dual I

S

Asynchronous Digital Mixing

S

Supports Master Clock Frequencies from 10MHz

S

2

S/PCM/TDM Digital Audio Interfaces

to 60MHz

RF Immune Analog Inputs and Outputs

S

Extensive Click-and-Pop Reduction Circuitry

S

2

I

C Control Interface

S

63 WLP Package (3.80mm x 3.30mm, 0.4mm Pitch)

S

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX9888EWY+

+Denotes lead(Pb)-free/RoHS-compliant package.

-40NC to +85NC

< 96kHz)

S

SPKVDD_

= 4.2V)

63 WLP

MAX9888

Simplified Block Diagram

2

I2C

CONTROL

DIGITAL MICROPHONE

LINEIN A1

LINEIN A2

LINEIN B1

LINEIN B2

INPUT

MIX

+

+

FlexSound TECHNOLOGY

• 5-BAND PARAMETRIC EQ

• AUTOMATIC LEVEL CONTROL

ADC

• LOUDSPEAKER PROCESSING

• EXCURSION LIMITER

• THD LIMITER

• POWER LIMITER

• MICROPHONE PROCESSING

• AUTOMATIC GAIN CONTROL

• NOISE GATE

ADC

• ASYNCHRONOUS DIGITAL
MIXING

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

S/PCM

I

DIGITAL

AUDIO

INTERFACE

MAX9888

I2S/PCM

DIGITAL

AUDIO

INTERFACE

RECEIVER AMP

SPEAKER AMP

DAC

DAC

SPEAKER AMP

MIX

HEADPHONE AMP

HEADPHONE AMP

Stereo Audio CODEC
with FlexSound Technology

TABLE OF CONTENTS

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features

Simplified Block Diagram

Ordering Information

Functional Diagram

MAX9888

Absolute Maximum Ratings

Electrical Characteristics

Digital Input/Output Characteristics

Input Clock Characteristics

Audio Interface Timing Characteristics

Digital Microphone Timing Characterstics

2

I

Power Consumption

Typical Operating Characteristics

Pin Configuration

Pin Description

Detailed Description

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C Timing Characterstics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Microphone to ADC

Line to ADC

Digital Loopback

Analog Loopback

DAC to Receiver

Line to Receiver

DAC to Speaker

Line to Speaker

DAC to Headphone

Line to Headphone

Speaker Bypass Switch

2

C Slave Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

I

Registers

Power Management

Microphone Inputs

Line Inputs

ADC Input Mixers

Record Path Signal Processing

Microphone AGC

Noise Gate

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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2

Stereo Audio CODEC

with FlexSound Technology

TABLE OF CONTENTS (continued)

ADC Record Level Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Sidetone

Digital Audio Interfaces

Clock Control

Passband Filtering

Playback Path Signal Processing

Playback Level Control

DAC Input Mixers

Preoutput Signal Path

Receiver Amplifier

Speaker Amplifiers

Speaker Amplifier Signal Processing

Headphone Amplifier

Output Bypass Switches

Click-and-Pop Reduction

Jack Detection

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

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Automatic Level Control

Parametric Equalizer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Preoutput Mixer

Preoutput PGA

Receiver Output Volume

Receiver Output Mixer

Speaker Output Volume

Speaker Output Mixers

Excursion Limiter

Power Limiter

Distortion Limiter

Headphone Output Mixers

Headphone Output Volume

Jack Insertion

Accessory Button Detection

Jack Removal

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

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MAX9888

3

Stereo Audio CODEC
with FlexSound Technology

TABLE OF CONTENTS (continued)

Battery Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Device Status

Device Revision

2

C Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

I

MAX9888

Bit Transfer

START and STOP Conditions

Early STOP Conditions

Slave Address

Acknowledge

Write Data Format

Read Data Format

Applications Information

Typical Operating Circuits

Analog Microphones and Bypass Switch

Digital Microphones and Receiver Amplifier

Filterless Class D Operation

RF Susceptibility

Startup/Shutdown Sequencing

Component Selection

Optional Ferrite Bead Filter

Input Capacitor

Charge-Pump Capacitor Selection

Charge-Pump Flying Capacitor

Charge-Pump Holding Capacitor

Unused Pins

Recommended PCB Routing

Supply Bypassing, Layout, and Grounding

WLP Applications Information

Package Information

Revision History

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

4

Stereo Audio CODEC

with FlexSound Technology

Functional Diagram

G6

F6

REF F7

REG

PREG

RECP/

A6

RXINP

RECN/

B6

RXINN

A3, B3

SPKLVDD

A4, B4

SPKLP

A5, B5

SPKLN

C4, C5

SPKLGND

SPKRVDD C3, D3

SPKRP C1, C2

SPKRN A1, B1

SPKRGND A2, B2

HPL B9

HPR C9

HPSNS C6

A8

HPVDD A7

HPGND

MAX9888

BIAS

0dB

MAX9888

G5

AVDD

G4

DVDD

SDIN2

SDOUT2

LRCLK2

LRCLKS2 SDOUTS2 SDINS2 DVDDS2

PORT S1 PORT S2

LRCLKS1 SDOUTS1 SDINS1 DVDDS1 BCLKS2

D1 D2 E4 D4 E1 F2 F3 G1 G3 G2

BCLKS1

BCLK2

SDIN1

SDOUT1

LRCLK1

BCLK1

SEL1 SEL2

DATA

INPUT

HIZOFF2

DATA

OUTPUT

MAS2

FRAME

CLOCK

BIT

CLOCK

MAS2

DAI2

DATA

INPUT

HIZOFF1

DATA

OUTPUT

MAS1

FRAME

CLOCK

BIT

CLOCK

MAS1

DAI1

LBEN1

RECVOL:

+8dB TO -62dB

MIX

FlexSound

TECHNOLOGY

DV1G:

0/6/12/18dB

+

LTEN1

DVST:

0dB TO -60dB

MUX

LBEN2

RECBYP

RECEN

MIXREC

+

MIX

SIDETONE

MULTI BAND ALC

NOISE GATE

DSTS

SPKBYP

BATTERY ADC

SPVOLL:

+8dB TO -62dB

DVEQ2:

0dB TO -15dB

DVEQ1:

0dB TO -15dB

AUDIO/

GAIN

AUTOMATIC

VOICE

+6dB

MIX

5-BAND

PARAMETRIC

5-BAND

PARAMETRIC

FILTERS

CONTROL

EQ

EQ

MODE1

ADLEN

AVFLT

MIX

POWER/

SPLEN

MIXSPL

DACL

MIX

EXCURSION LIMITER

EQ1EN EQ2EN

AVLG: 0/6/12/18dB

ADCL

DISTORTION LIMITER

DALEN

MIXDAL

AUDIO/

FILTERS

DCB2

DV2:

0dB TO -15dB

AVL: 3dB TO -12dB

MIXADL

HPVOLR:

HPLEN

MIXHPL

+9dB

PREOUT1

0dB TO -23dB

MIX

MIXOUT1

+3dB TO -67dB

MIX

PGAOUT2:

0dB TO -23dB

MIX

HPREN

MIXHPR

+9dB

PREOUT2

PGAOUT3:

MIXOUT2

HPVOLL:

+3dB TO -67dB

+6dB

SPREN

MIX

SPVOLR:

+8dB TO -62dB

MIX

MIXSPR

DACR

DAREN

MIX

MIXDAR

VOICE

AUDIO/

FILTERS

MODE1

DVFLT

DV1:

0dB TO -15dB

AVRG: 0/6/12/18dB

AVR: 3dB TO -2dB

PGAOUT1:

ADCR

ADREN

MIX

MIXADR

CHARGE

0dB TO -23dB

MIX

PUMP

+9dB

PREOUT3

MIXOUT3

B7B8A9G7F1

C1N C1P

HPVSSAGND

DGND

PSCLK

CLOCK

MCLK

E5F5F4 E2

IRQ

C

2

I

SCL

SDA

JACK

DETECTION

JACKSNS

D6

JDETEN

REG

MBEN

MICBIAS

G8

CONTROL

PGAM1:

MIC1P/

DIGMICDATA

E8

+20dB TO 0dB

MIC1N/

DIGMICCLK

F8

PA1EN:

EXTMIC

0/20/30dB

MIC2BYP

PGAM2:

+20dB TO 0dB

F9 MIC2P

G9 MIC2N

PA2EN:

EXTMIC

0/20/30dB

PGAINA:

+20dB TO -6dB

INABYP

INADIFF

INA1/EXTMICP

E9

PGAINA:

+20dB TO -6dB

INA2/EXTMICN

D9

+

PGAINB:

+20dB TO -6dB

INBDIFF

PGAINB:

+20dB TO -6dB

+

INB2

INB1

C8

D8

5

Stereo Audio CODEC
with FlexSound Technology

ABSOLUTE MAXIMUM RATINGS

(Voltages with respect to AGND.)
DVDD, AVDD, HPVDD
SPKLVDD, SPKRVDD, DVDDS1, DVDDS2
DGND, HPGND, SPKLGND, SPKRGND
HPVSS

............................... (HPGND - 2.2V) to (HPGND + 0.3V)

C1N

.................................... (HPVSS - 0.3V) to (HPGND + 0.3V)

C1P

.....................................(HPGND - 0.3V) to (HPVDD + 0.3V)

PREG

MAX9888

..................................................... -0.3V to (AVDD + 0.3V)

REF, MICBIAS

................................. -0.3V to (SPKLVDD + 0.3V)

.........................................-0.3V to +2.2V

..........-0.3V to +6.0V

..............-0.1V to +0.1V

MCLK, SDINS1, SDINS2, JACKSNS,

SDA, SCL, IRQ

LRCLKS1, BCLKS1, SDOUTS1
LRCLKS2, BCLKS2, SDOUTS2

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

.................................................-0.3V to +6.0V

......... -0.3V to (DVDDS1 + 0.3V)

......... -0.3V to (DVDDS2 + 0.3V)

ELECTRICAL CHARACTERISTICS

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

PGAIN_

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLY

Supply Voltage Range Guaranteed by PSRR

Total Supply Current (Note 2) I

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 2.2FF, C

REF

DACATTN

= 0dB, AV

REC

Full-duplex 8kHz mono,
receiver output (Note 3)

DAC playback 48kHz stereo,
headphone outputs (Note 3)

DAC playback 48kHz stereo,

VDD

speaker outputs (Note 3)

Full-duplex 48kHz stereo,
microphone inputs,
headphone outputs (Note 3)

Stereo line playback,
IN_DIF = 0, INA1 to HPL,
INA2 to HPR, V

REG, INA1, INA2, INB1, INB2, MIC1P/DIGMICDATA,

MIC1N/DIGMICCLK, MIC2P, MIC2N ...............-0.3V to +2.2V

HPSNS

............................... (HPGND - 0.3V) to (HPGND + 0.3V)

HPL, HPR
RECP, RECN
SPKLP, SPKLN
SPKRP, SPKRN

............................(HPVSS - 0.3V) to (HPVDD + 0.3V)

..............(SPKLGND - 0.3V) to (SPKLVDD + 0.3V)

...........(SPKLGND - 0.3V) to (SPKLVDD + 0.3V)

.........(SPKRGND - 0.3V) to (SPKRVDD + 0.3V)

Continuous Power Dissipation (TA = +70NC)

63-Bump WLP (derate 25.6mW/NC above +70NC)
Operating Temperature Range
Storage Temperature Range
Soldering Temperature (reflow)

SPKLVDD

= 0dB, AV

= V

SPKRVDD

MICBIAS

SPK_

= C

PREG

DACGAIN

= 0dB, AV

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

, V

,

AVDD

,

V

SPKLVDD

V

SPKRVDD

V

DVDD

V

HPVDD

V

DVDDS1

V

DVDDS2

= 3.7V. Speaker loads (Z

= C

,

.......................... -40NC to +85NC

............................-65NC to +150NC

......................................+260NC

= 1FF, C

REG

ADCLVL

C1N-C1P

= 0dB, AV

ADCGAIN

2.8 5.5

1.65 1.8 2.0

1.65 3.6

Analog 6.37 10
Speaker 1.98 3.5
Digital 1.49 3
Analog 2.71 4
Speaker 1.65 2.5
Digital 2.93 4.5
Analog 1.85 3
Speaker 8.22 18
Digital 2.94 5

Analog 12.75 18

Speaker 1.7 3

Digital 3.75 5.5

Analog 5.11 7
Speaker 0.58 1

= 0V

MCLK

Digital 0.03 0.06

........2.05W

) connected

SPK

= 1FF, C

HPVSS

= 0dB,

V

mA

6

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Shutdown Supply Current
(Note 2)

REF Voltage 2.5 V
PREG Voltage 1.6 V
REG Voltage 0.7 V

Shutdown to Full Operation

MICROPHONE TO ADC PATH

Dynamic Range (Note 4) DR

Total Harmonic Distortion +
Noise

Common-Mode Rejection Ratio CMRR V

Power-Supply Rejection Ratio PSRR

Path Phase Delay

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

T

A

REF

DACATTN

REC

= +25NC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

SLEW = 0
SLEW = 1

= 8kHz, MODE = 0 (IIR voice),

f

S

THD+N

AV

MICPRE_

V

IN

f

= 8kHz, f = 1kHz

S

MICPRE_

AV

MICPRE_

= 0dB

= 0.1V

, MCLK = 12.288MHz,

P-P

= 0dB, VIN = 1V

= +30dB, VIN = 32mV

f = 1kHz

= 100mV

IN

V

= 1.65V to 2.0V, input referred, MIC

AVDD

, f = 217Hz 65 dB

P-P

inputs floating

f = 217Hz, V

RIPPLE

= 100mV

input referred

f = 1kHz, V

RIPPLE

= 100mV

input referred

f = 10kHz, V

RIPPLE

= 100mV

input referred

MODE = 0 (IIR voice)

8kHz
1kHz, 0dB input,
highpass filter
disabled measured
from analog input to
digital output

MODE = 0 (IIR voice)

16kHz

MODE = 1 (FIR audio)

8kHz

MODE = 1 (FIR audio)

48kHz

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

Analog 0.2 2
Speaker 0.1 1
Digital 1 5

30
17

75 88 dB

-77 -65

, f = 1kHz -82

P-P

,

P-P

-71

60 100

P-P

P-P

P-P

, AV

, AV

, AV

ADC

ADC

ADC

= 0dB,

= 0dB,

= 0dB,

100

91

70

2.2

1.1

4.5

0.76

HPVSS

FA

ms

dBAV

dB

ms

MAX9888

7

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

MICROPHONE PREAMP

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Full-Scale Input AV

Preamplifier Gain AV

PGA Gain AV

MIC Input Resistance R

MICROPHONE BIAS

MICBIAS Output Voltage V
Load Regulation I
Line Regulation V

Ripple Rejection

Noise Voltage

MICROPHONE BYPASS SWITCH

On-Resistance R

Total Harmonic Distortion +
Noise

Off-Isolation

Off-Leakage Current

LINE INPUT TO ADC PATH

Dynamic Range (Note 4) DR

Total Harmonic Distortion +
Noise

Gain Error DC accuracy 1 5 %

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

DACATTN

MICPRE_

REF

REC

= 0dB 1.05 V

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

PA1EN/PA2EN = 01 0

MICPRE_

(Note 5)

PA1EN/PA2EN = 11 29.4 30 30.5

MICPGA_

IN_MIC

MICBIASILOAD

(Note 5)

All gain settings, measured at MIC1P/MIC1N/
MIC2P/MIC2N

LOAD

SPKLVDD

f = 217Hz, V
f = 10kHz, V

= 1mA 2.14 2.2 2.25 V
= 1mA to 2mA 0.5 11 mV

PGAM1/PGAM2 = 0x00 19.5 20 20.5
PGAM1/PGAM2 = 0x14 0

= 2.8V to 5.5V 100

RIPPLE (SPKLVDD)

RIPPLE (SPKLVDD)

A-weighted, f = 20Hz to 20kHz 3.8
P-weighted, f = 20Hz to 4kHz 2.1
f = 1kHz 33

I

= 100mA, INABYP = MIC2BYP = 1,

ON

THD+N

MIC1_

V

MIC2_

V

IN

= V

= 2V

= (0V, V

INA_

, VCM = 0.9V, RL = 10kI,

P-P

AVDD

f = 1kHz, INABYP = MIC2BYP = 1

V

IN

= 2V

, VCM = 0.9V, RL = 10kI,

P-P

f = 1kHz

V

= (0V, V

MIC1_

V

MIC2_/VINA_

= 48kHz, MCLK = 12.288MHz, MODE = 1

f

S

= (V

AVDD

AVDD

),

, 0V)

(FIR audio)

THD+N V

IN

= 1V

, f = 1kHz -77 dB

P-P

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

30 50

= 100mV
= 100mV

)

P-P

P-P

92
83

3.5 20

-80 dB

60 dB

-2.5 +2.5

91 dB

) connected

HPVSS

= 0dB,

P-P

dBPA1EN/PA2EN = 10 19.5 20 20.5

dB

kI

FV

dB

FV

RMS

nV/√Hz

I

FA

8

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LINE INPUT PREAMP

Full-Scale Input V

Level Adjust Gain AV

Input Resistance R

Feedback Resistance R

ADC LEVEL CONTROL

ADC Level Adjust Range AV
ADC Level Adjust Step Size 1 dB
ADC Gain Adjust Range AV
ADC Gain Adjust Step Size 6 dB

ADC DIGITAL FILTERS
VOICE MODE IIR LOWPASS FILTER (MODE1 = 0)

Passband Cutoff f

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation (Note 6) f > f

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

IN

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

AV
AV

REF

DACATTN

REC

= 0dB 1

PGAIN_

= -6dB 1.4

PGAIN_

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

PGAINA/PGAINB = 0x0 19 20 21

PGAINA/PGAINB = 0x1 13 14 15

PGAINA/PGAINB = 0x2 (Note 5) 2 3 4

PGAIN_

PGAINA/PGAINB = 0x3

PGAINA/PGAINB = 0x4 -4 -3 -2

PGAINA/PGAINB = 0x5, 0x6, 0x7 -7 -6 -5

IN

IN_FB

ADCLVL

ADCGAIN

AV
AV
AV
AV
AV
AV

INAEXT/INBEXT = 1

AVL/AVR = 0xF to 0x0 (Note 5) -12 +3 dB

AVLG/AVRG = 00 to 11 (Note 5) 0 18 dB

= +20dB 14.6 21 27.4

PGAIN_

= +14dB 20

PGAIN_

= +3dB 20

PGAIN_

= 0dB 7.3 10 13.7

PGAIN_

= -3dB 20

PGAIN_

= -6dB 20

PGAIN_

T
T

Ripple limit cutoff

PLP

-3dB cutoff

PLP

SLP

SLP

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

0

= +25NC

A

= T

A

MIN

= +25NC

T

A

to T

MAX

18.5 20 21.5

17.5 23

0.441
x f

s

0.449
x f

s

-0.1 +0.1 dB

0.47
x f

s

74 dB

HPVSS

V

MAX9888

P-P

dB

kI

kI

Hz

Hz

9

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

VOICE MODE IIR HIGHPASS FILTER (MODE1 = 0)

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Passband Cutoff
(-3dB from Peak)

Stopband Cutoff
(-30dB from Peak)

DC Attenuation DC

STEREO AUDIO MODE FIR LOWPASS FILTER (MODE1 = 1, DHF1 = 0, LRCLK < 50kHz)

Passband Cutoff f

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation (Note 6) f < f

ADC STEREO AUDIO MODE FIR LOWPASS FILTER (MODE1 = 1, DHF1 = 1, LRCLK > 50kHz)

Passband Cutoff f

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC
MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

AVFLT = 0x1 (elliptical tuned for
f

= 16kHz + 217Hz notch)

s

AVFLT = 0x2 (500Hz Butterworth tuned for
fs = 16kHz)

f

AHPPB

AVFLT = 0x3 (elliptical tuned for
f

= 8kHz + 217Hz notch)

s

AVFLT = 0x4 (500Hz Butterworth tuned for
f

= 8kHz)

s

AVFLT = 0x5 (fs/240 Butterworth)

AVFLT = 0x1 (elliptical tuned for
f

= 16kHz + 217Hz notch)

s

AVFLT = 0x2 (500Hz Butterworth tuned for
fs = 16kHz)

f

AHPSB

AVFLT = 0x3 (elliptical tuned for
f

= 8kHz + 217Hz notch)

s

AVFLT = 0x4 (500Hz Butterworth tuned for fs =
8kHz)

AVFLT = 0x5 (fs/240 Butterworth)

ATTEN

AVFLT ≠ 000

Ripple limit cutoff

PLP

-6.02dB cutoff

PLP

SLP

SLP

Ripple limit cutoff

PLP

-3dB cutoff

= V

SPKRVDD

= C

PREG

DACGAIN

= 0dB, AV

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

0.0139
x f

s

0.0156
x f

s

0.0279
x f

s

0.0312
x f

s

0.002
x f

s

90 dB

0.43
x f

s

0.48
x f

s

0.5
x f

s

-0.1 +0.1 dB

60 dB

0.208
x f

s

0.28
x f

s

) connected

SPK

= 1FF, C

ADCGAIN

0.0161
x f

s

0.0319
x f

s

0.0321
x f

s

0.0632
x f

s

0.0043
x f

s

0.58
x f

s

HPVSS

= 0dB,

Hz

Hz

Hz-3dB cutoff

Hz

Hz

10

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation f < f

ADC STEREO AUDIO MODE DC-BLOCKING HIGHPASS FILTER (MODE1 = 1)

Passband Cutoff
(-3dB from Peak)

DC Attenuation DC

MICROPHONE AUTOMATIC GAIN CONTROL

AGC Hold Duration

AGC Attack Time

AGC Release Time

AGC Threshold Level AGCTH = 0x0 to 0xF -3 +18 dB
AGC Threshold Step Size 1 dB
AGC Gain (Note 5) 0 20 dB

ADC NOISE GATE

NG Threshold Level ANTH = 0x3 to 0xF, referred to 0dBFS -64 -16 dB
NG Attenuation (Note 5) 0 12 dB

ADC-TO-DAC DIGITAL SIDETONE (MODE = 0)

Sidetone Gain Adjust Range AV

Sidetone Gain Adjust Step Size 2 dB

Sidetone Path Phase Delay

ADC-TO-DAC DIGITAL LOOP-THROUGH PATH

Dynamic Range (Note 4) DR

Total Harmonic Distortion THD

DAC LEVEL CONTROL

DAC Attenuation Range AV
DAC Attenuation Step Size
DAC Gain Adjust Range AV
DAC Gain Adjust Step Size 6 dB

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

f

AHPPB

= V

= J, Z

= 0dB, AV

HP_

SLP

Atten

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

PLP

SLP

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

AVFLT ≠ 000

AVFLT ≠ 000

AGCHLD = 01 50
AGCHLD = 11 400
AGCATK = 00 2
AGCATK = 11 123
AGCRLS = 000 0.078
AGCRLS = 111 10

STGA

DVST = 0x01 -0.5
DVST = 0x1F -60.5

1kHz, 0dB input, highpass
filter disabled

= 48kHz, MCLK = 12.288MHz, MODE = 1

f

S

(FIR audio)

f = 1kHz, f

= 48kHz, MCLK = 12.288MHz,

S

MODE = 1 (FIR audio)

DACATTN

DACGAIN

DV1DV2 = 0xF to 0x0 (Note 5) -15 0 dB

DV1G = 00 to 11 (Note 5) 0 18 dB

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

-0.1 +0.1 dB

0.417
x f

s

60 dB

0.000125
x fs

90 dB

8kHz 2.2
16kHz 1.1

89 dB

-71 -66 dB

1 dB

MAX9888

Hz

Hz

ms

ms

s

dB

ms

11

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DAC DIGITAL FILTERS
VOICE MODE IIR LOWPASS FILTER (MODE1 = 0)

Passband Cutoff f

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation (Note 6) f > f

VOICE MODE IIR HIGHPASS FILTER (MODE1 = 0)

Passband Cutoff
(-3dB from Peak)

Stopband Cutoff
(-30dB from Peak)

DC Attenuation DC

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

Ripple limit cutoff

PLP

-3dB cutoff

PLP

SLP

SLP

DVFLT = 0x1 (elliptical tuned for
f

= 16kHz + 217Hz notch)

s

DVFLT = 0x2 (500Hz Butterworth tuned for
fs = 16kHz)

f

DHPPB

DVFLT = 0x3 (elliptical tuned for
f

= 8kHz + 217Hz notch)

s

DVFLT = 0x4 (500Hz Butterworth tuned for
f

= 8kHz)

s

DVFLT = 0x5 (fs/240 Butterworth)

DVFLT = 0x1 (elliptical tuned for
f

= 16kHz + 217Hz notch)

s

DVFLT = 0x2 (500Hz Butterworth tuned for
fs = 16kHz)

f

DHPSB

DVFLT = 0x3 (elliptical tuned for
f

= 8kHz + 217Hz notch)

s

DVFLT = 0x4 (500Hz Butterworth tuned for
f

= 8kHz)

s

DVFLT = 0x5 (fs/240 Butterworth)

ATTEN

DVFLT ≠ 000

= V

SPKRVDD

MICBIAS

SPK_

= C

DACGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

0.448
x f

s

0.451
x f

s

-0.1 +0.1 dB

0.476
x f

s

75 dB

0.0161
x f

s

0.0312
x f

s

0.0321
x f

s

0.0625
x f

s

0.0042
x f

s

0.0139
x f

s

0.0156
x f

s

0.0279
x f

s

0.0312
x f

s

0.002
x f

s

85 dB

HPVSS

= 0dB,

Hz

Hz

Hz

Hz

12

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STEREO AUDIO MODE FIR LOWPASS FILTER (MODE1 = 1, DHF1/DHF2 = 0, LRCLK < 50kHz)

Passband Cutoff f

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation (Note 6) f > f

STEREO AUDIO MODE FIR LOWPASS FILTER (MODE1 = 1, DHF1/DHF2 = 1 for LRCLK > 50kHz)

Passband Cutoff f

Passband Ripple f < f

Stopband Cutoff f

Stopband Attenuation (Note 6) f < f

STEREO AUDIO MODE DC-BLOCKING HIGHPASS FILTER

Passband Cutoff (-3dB from
Peak)

DC Attenuation DC

AUTOMATIC LEVEL CONTROL

Dual Band Lowpass Corner
Frequency

Dual Band Highpass Corner
Frequency

Gain Range 0 12 dB
Low Signal Threshold ALCTH = 111 to 001 -48 -12 dBFS

Release Time

PARAMETRIC EQUALIZER

Number of Bands 5 Bands
Per Band Gain Range -12 +12 dB
Preattenuator Gain Range (Note 5) -15 0 dB
Preattenuator Step Size 1

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

Ripple limit cutoff

PLP

-6.02dB cutoff

PLP

SLP

SLP

Ripple limit cutoff

PLP

-3dB cutoff

PLP

SLP

SLP

f

DHPPB

ATTEN

DVFLT ≠ 000 (DAI1), DCB2 = 1 (DAI2)

DVFLT ≠ 000 (DAI1), DCB2 = 1 (DAI2)

ALCMB = 1 5 kHz

ALCMB = 1 5 kHz

ALCRLS = 101 0.25
ALCRLS = 000 8

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

0.43
x f

s

0.47
x f

s

Hz-3dB cutoff

0.5
x f

s

-0.1 +0.1 dB

0.58
x f

Hz

s

60 dB

0.24
x f

0.31
x f

s

s

Hz

-0.1 +0.1 dB

0.477
x f

Hz

s

60 dB

0.000104
x f

Hz

s

90 dB

s

dB

MAX9888

13

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

DAC-TO-RECEIVER AMPLIFIER PATH

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Dynamic Range (Note 4) DR f

Total Harmonic Distortion +
Noise

Click and Pop Level K

PREOUTPUT MIXERS

Level Adjust Gain AV

Level Adjust Step Size 2 dB
Mute Attenuation f = 1kHz 85 dB

LINE INPUT-TO-RECEIVER AMPLIFIER PATH

Dynamic Range (Note 4) DR Referenced to full-scale output level 92 dB
Total Harmonic Distortion +

Noise

Power-Supply Rejection Ratio PSRR

Click-and-Pop Level K

RECEIVER AMPLIFIER

Output Power P
Full-Scale Output (Note 7) 1 V

Volume Control AV

Volume Control Step Size

Mute Attenuation f = 1kHz 95 dB
Output Offset Voltage V

Capacitive Drive Capability No sustained oscillations

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

THD+N

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 48kHz, MCLK = 12.288MHz, f = 1kHz 96 dB

S

f = 1kHz, P

REF

DACATTN

REC

OUT

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

= 25mW, R

MICBIAS

SPK_

Peak voltage, A-weighted, 32
samples per second, AV

CP

REC

= 0dB

PGAOUTA/PGAOUTB/

PGAOUT_

(Note 5)

PGAOUTC = 0x0
PGAOUTA/PGAOUTB/

PGAOUTC = 0xC

THD+N -70 dB

V

SPKLVDD

f = 217Hz, V
f = 1kHz, V
f = 10kHz, V

= 2.8V to 5.5V 54 89

= 100mV

RIPPLE

= 100mV

RIPPLE

= 100mV

RIPPLE

Peak voltage, A-weighted, 32
samples per second, AV

CP

REC

= 0dB

R

OUT

REC

= 32I, f = 1kHz, THD = 1%

REC

(Note 5)

+8dB to +6dB 0.5
+6dB to +0dB 1
0dB to -14dB 2

-14dB to -38dB 3

-38dB to -62dB 4

AV

OS

REC

= -62dB

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

REC

= 32I

-70 -63 dB

Into shutdown -70

Out of shutdown -73

0

-25 -23.4 -22

P-P

P-P

P-P

-63

-63

-65

Into shutdown -57

Out of shutdown -55

100 mW

RECVOL = 0x00 -65 -62 -58
RECVOL = 0x1F

T

= +25NC

A

R

= 32I

REC

= J

R

REC

+7.5 +8 +8.5

±0.13 ±1

500
100

) connected

HPVSS

= 0dB,

dBV

dB

dB

dBV

RMS

dB

dB

mV

pF

14

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DAC-TO-SPEAKER AMPLIFIER PATH

Total Harmonic Distortion +
Noise

Crosstalk

Output Noise A-weighted 43

Click-and-Pop Level K

LINE INPUT-TO-SPEAKER AMPLIFIER PATH

Total Harmonic Distortion +
Noise

Output Noise A-weighted 56

Power-Supply Rejection Ratio PSRR

Click-and-Pop Level K

SPEAKER AMPLIFIER

Output Power P

Full-Scale Output (Note 7) 2 V

Volume Control (Note 5) AV

Volume Control Step Size

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

THD+N

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

f = 1kHz, P

REF

DACATTN

REC

OUT

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

= 250mW, Z

MICBIAS

SPK_

SPKL to SPKR and SPKR to SPKL,

= 640mW, f = 1kHz

P

OUT

Peak voltage, A-weighted,
32 samples per second,

CP

AV

= 0dB

SPK_

THD+N

f = 1kHz, P

V

SPKLVDD

f = 217Hz, V
f = 1kHz, V
f = 10kHz, V

= 200mW, Z

OUT

= V

RIPPLE

RIPPLE

RIPPLE

= 2.8V to 5.5V 43 60

RIPPLE

= 100mV 75

= 100mV 73

= 100mV 50

Peak voltage, A-weighted,
32 samples per second,

CP

AV

= 0dB

SPK_

V
V

V

OUT

f = 1kHz, THD = 1%,
Z

= 8I + 68FH

SPK

V

V
V

V
V

SPK_

SPVOLL/SPVOLR = 0x00 -69 -64 -59
SPVOLL/SPVOLR = 0x1F
+8dB to +6dB 0.5
+6dB to +0dB 1
0dB to -14dB 2

-14dB to -38dB 3

-38dB to -64dB 4

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

= 8I + 68FH

SPK

-71 dB

-75

Into shutdown -65

Out of shutdown -65

= 8I + 68FH

SPK

-66 dB

Into shutdown -48

Out of shutdown -50

SPKLVDD
SPKRVDD

SPKLVDD
SPKRVDD

SPKLVDD
SPKRVDD

SPKLVDD
SPKRVDD

=

= 5.0V

=

= 4.2V

=

= 3.7V

=

= 3.2V

1370

954

733

544

+7.5 +8 +8.5

HPVSS

= 0dB,

dB

FV

RMS

dBV

FV

RMS

dB

dBV

mW

RMS

dB

dB

MAX9888

15

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Mute Attenuation f = 1kHz 86 dB
Output Offset Voltage V

EXCURSION LIMITER

Upper-Corner Frequency Range DHPUCF = 001 to 100 400 1000 Hz
Lower-Corner Frequency DHPLCF = 01 to 10 400 Hz

Biquad Minimum Corner
Frequency

Threshold Voltage

Release Time

POWER LIMITER

Attenuation -64 dB

Threshold

Time Constant 1 t

Time Constant 2 t

Weighting Factor k

DISTORTION LIMITER

Distortion Limit

Release Time Constant

DAC-TO-HEADPHONE AMPLIFIER PATH

Dynamic Range (Note 4) DR

Total Harmonic Distortion +
Noise

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

OS

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

AV

REF

DACATTN

REC

= -64dB, TA = +25NC

SPK_

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

DHPUCF = 000 (fixed mode) 100
DHPUCF = 001 200
DHPUCF = 010 300
DHPUCF = 011 400
DHPUCF = 100 500

= 8I + 68FH,

Z

SPK

V

SPKLVDD

5.5V, AV

= V

SPK_

SPKRVDD

= +8dB

=

ALCRLS = 101 0.25
ALCRLS = 000 4

= 8I + 68FH,

Z

SPK

PWR1

PWR2

PWR

V

SPKLVDD

5.5V, AV

PWRT1 = 0x1 0.5
PWRT1 = 0xF 8.7
PWRT2 = 0x1 to 0xF 0.5
PWRT2 = 0xF 8.7
PWRK = 000 to 111 12.5 100 %

= V

SPK_

SPKRVDD

= +8dB

=

THDCLP = 0x1 < 1
THDCLP = 0xF 24
THDT1 = 000
THDT1 = 111 6.2

Master or slave mode 100
Slave mode 94

= 20mW

= 1

, RHP = 10kI

VRMS

THD+N

= 48kHz, MCLK =

f

S

12.288MHz

f

= 48kHz, MCLK = 12.288MHz,

S

f = 1kHz, P

f

= 48kHz, MCLK = 12.288MHz,

S

f = 1kHz, V

OUT

OUT

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

±0.25 ±1.25

DHPTH = 000 0.34

DHPTH = 111 4.95

PWRTH = 0x1 0.05

PWRTH = 0xF 1.80

0.76

R

R

= 16I

HP

= 32I

HP

-71 -64

-75

-79

) connected

HPVSS

= 0dB,

mV

Hz

V

P

s

W

s

min

%

s

dB

dB

16

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Crosstalk

Power-Supply Rejection Ratio PSRR

DAC Path Phase Delay

Gain Error 1 %
Channel Gain Mismatch 0.5 %

Click-and-Pop Level K

LINE INPUT-TO-HEADPHONE AMPLIFIER PATH

Total Harmonic Distortion +
Noise

Dynamic Range (Note 4) DR 91 dB

Power-Supply Rejection Ratio PSRR

Click and Pop Level K

HEADPHONE AMPLIFIER

Output Power P

Full-Scale Output (Note 7) 1 V

Volume Control AV

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC

MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

f = 1kHz, Input = -1dBFS, R

HPL to HPR and HPR to HPL,

= 5mW, f = 1kHz, RHP = 32I

P

OUT

= V

V

AVDD

f = 217Hz, V
f = 1kHz, V
f = 10kHz, V

= 1.65V to 2.0V 60 84

HPVDD

= 100mV, AV

RIPPLE

= 100mV, AV

RIPPLE

= 100mV, AV

RIPPLE

MODE = 0 (voice) 8kHz 2.2

1kHz, 0dB input,
highpass filter
disabled measured
from digital input to
analog output

MODE = 0 (voice)
16kHz

MODE = 1 (music)
8kHz

MODE = 1 (music)
48kHz

Peak voltage, A-weighted,
32 samples per second,

CP

AV

= 0dB

HP_

THD+N

= 1V

V

IN

P-P

= V

V

AVDD

f = 217Hz, V
f = 1kHz, V
f = 10kHz, V

, f =1kHz, RHP = 32I

= 1.65V to 2.0V 42 66

HPVDD

= 100mV

RIPPLE

= 100mV

RIPPLE

= 100mV

RIPPLE

Peak voltage, A-weighted,
32 samples per second,

CP

AV

= 0dB

HP_

OUT

f = 1kHz, THD = 1%

TA = +25NC (Note 5)

HP_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

= 10kI

HP

-82 dB

-82 dB

= 0dB 92

VOL

= 0dB 91

VOL

= 0dB 57

VOL

1.1

4.5

0.76

Into shutdown -66

Out of
shutdown

-67

dBV

-70 dB

P-P

P-P

P-P

62
57
41

Into shutdown -62

dBV

mW

R

HP

R

HP

Out of
shutdown

= 32I
= 16I

-60

32
40

HPVOL_ = 0x00 -71 -67 -66
HPVOL_ = 0x1F 2.4 3 3.5

MAX9888

dB

ms

dB

RMS

dB

17

Stereo Audio CODEC
with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

= T

A

MAX9888

MICPRE_

= 0dB, AV

PGAIN_

to T

MIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Volume Control Step Size

Mute Attenuation f = 1kHz 82 dB

Output Offset Voltage V

Capacitive Drive Capability

Charge Pump Oscillator
Frequency

SPEAKER BYPASS SWITCH

On-Resistance R

Total Harmonic Distortion +
Noise

Off-Isolation

Off-Leakage Current

RECEIVER BYPASS SWITCH

On-Resistance R

Total Harmonic Distortion +
Noise

Off-Isolation

Off-Leakage Current

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC
MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

+3dB to +1dB 0.5
+1dB to -5dB 1

-5dB to -19dB 2

-19dB to -43dB 3

-43dB to -67dB 4

= +25NC

T

OS

f

CP

ON

THD+N

AV

= -67dB

HP_

No sustained
oscillations

Slow mode 74

I

= 100mA, SPKBYP = 1,

SPKL_

V

= [0V, V

RXIN_

V

= 2V

IN

Z

= 8I + 68FH, f = 1kHz,

SPK

, VCM = V

P-P

SPKLVDD]

A

T

= T

A

R

HP

R

HP

SPKLVDD

SPKBYP = 1

ON

THD+N

= 2V

V

IN

Z

= 8I + 68FH, f = 1kHz

L

V

RXIN_

V

SPKL_

I

RECP

V

RECN

= 2V

V

IN

R

= 32I, f = 1kHz, RECBYP = 1

L

= 2V

V

IN

R

= 32I, f = 1kHz

L

V

RECP

V

RECN

, VCM = V

P-P

= [0V, V

= [V

SPKLVDD

SPKLVDD

SPKLVDD

, 0V]

],

= 100mA, RECBYP = 1,

= [0V, V

, VCM = V

P-P

, VCM = V

P-P

= [0V, V

= [V

SPKLVDD

SPKLVDD

SPKLVDD

]

SPKLVDD

SPKLVDD

],

, 0V]

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

±0.2 ±1

to T

MIN

= 32I
= J

MAX

±2

500
100

300 667 900

2.8 4.5

/2,

/2,

R

S

R

S

= 10I

= 0I

-77

-60

96

-1 +1

1.2 2

/2,

/2,

-66 %

80 dB

-15 +15

) connected

HPVSS

= 0dB,

dB

mV

pF

kHz

I

dB

dB

FA

I

FA

18

Stereo Audio CODEC

with FlexSound Technology

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV
T

A

PGAIN_

= T

MIN

MICPRE_

= 0dB, AV

to T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

JACK DETECTION

JACKSNS High Threshold V

JACKSNS Low Threshold V

JACKSNS Sense Voltage V
JACKSNS Sense Resistance R
JACKSNS Weak Pullup Current I

JACKSNS Deglitch Period t

BATTERY ADC

Input Voltage Range 2.8 5.5 V
LSB Size 0.1 V

= V

HPVDD

= +20dB, AV

PGAOUT_

, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)

MAX

DVDD

= J, R

HP

= V

DVDDS1

REC
MICPGA_

= 0dB, AV

= V

= J, Z

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

MICBIAS enabled

TH1

MICBIAS disabled

MICBIAS enabled

TH2

MICBIAS disabled

SENSE

SENSE

WPU

GLITCH

MICBIAS disabled V
MICBIAS disabled, JDWK = 0 1.7 2.4 2.9
MICBIAS disabled, JDWK = 1 2 5 9.5
JDEB = 00 25
JDEB = 11 200

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1.

0.92 x

V

MICBIAS

0.92 x

V

SPKLVD

0.06 x

V

MICBIAS

0.06 x

V

SPKLVD

V

V

D

SPKLVDD

V

V

D

SPKLVDD

SPKLVDD

0.95 x

MICBIAS

0.95 x

0.10 x

MICBIAS

0.10 x

0.98 x

V

MICBIAS

0.98 x

V

SPKLVD

0.17 x

V

MICBIAS

0.17 x

V

SPKLVD

D

D

HPVSS

V

V

V
kI
FA

ms

MAX9888

DIGITAL INPUT/OUTPUT CHARACTERISTICS

(V

= V

AVDD

otherwise noted. Typical values are at T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MCLK

Input High Voltage V
Input Low Voltage V
Input Leakage Current I
Input Capacitance 10 pF

SDINS1, BCLKS1, LRCLKS1—INPUT

Input High Voltage V

Input Low Voltage V

Input Hysteresis 200 mV
Input Leakage Current I
Input Capacitance 10 pF

HPVDD

= V

DVDD

= V

DVDDS1

IH

IL

, I

IH

IH

IL

, I

IH

= V

= +25NC.) (Note 1)

A

IL

IL

= 1.65V to 2.0V, V

DVDDS2

V

= 2.0V, VIN = 0V, 5.5V, TA = +25°C -1 +1 FA

DVDD

V

= 3.6V, VIN = 0V, 3.6V; TA = +25°C -1 +1 FA

DVDDS1

SPKLVDD

= V

SPKRVDD

DVDDS1

= 3.7V, TA = T

MIN

to T

MAX

, unless

1.2 V

0.6 V

0.7 x

0.29 x

DVDDS1

V

V

19

Stereo Audio CODEC
with FlexSound Technology

DIGITAL INPUT/OUTPUT CHARACTERISTICS (continued)

(V

= V

AVDD

otherwise noted. Typical values are at T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BCLKS1, LRCLKS1, SDOUTS1—OUTPUT

Output Low Voltage V

Output High Voltage V

MAX9888

Input Leakage Current I

SDINS2, BCLKS2, LRCLKS2—INPUT

Input High Voltage V

Input Low Voltage V

Input Hysteresis 200 mV
Input Leakage Current I
Input Capacitance 10 pF

BCLKS2, LRCLKS2, SDOUTS2—OUTPUT

Output Low Voltage V

Output High Voltage V

Input Leakage Current I

SDA, SCL—INPUT

Input High Voltage V

Input Low Voltage V

Input Hysteresis 210 mV
Input Leakage Current I
Input Capacitance 10 pF

SDA, IRQ—OUTPUT

Output High Current I

Output Low Voltage V

DIGMICDATA—INPUT

Input High Voltage V

Input Low Voltage V

Input Hysteresis 125 mV
Input Leakage Current I
Input Capacitance 10 pF

HPVDD

= V

DVDD

= V

DVDDS1

OL

OH

, I

IH

IH

IL

, I

IH

OL

OH

, I

IH

IH

IL

, I

IH

OH

OL

IH

IL

, I

IH

= V

= +25NC.) (Note 1)

A

IL

IL

IL

IL

IL

= 1.65V to 2.0V, V

DVDDS2

V

V

V

= 1.65V, IOL = 3mA 0.4 V

DVDDS1

= 1.65V, IOH = 3mA

DVDDS1

= 2.0V, VIN = 0V, 5.5V; TA = +25°C,

DVDD

high-impedance state

V

V

V

V

= 3.6V, VIN = 0V, 3.6V; TA = +25°C -1 +1 FA

DVDDS2

= 1.65V, IOL = 3mA 0.4 V

DVDDS2

= 1.65V, IOH = 3mA

DVDDS2

= 2.0V, VIN = 0V, 5.5V; TA = +25NC,

DVDD

high-impedance state

V

= 2.0V, VIN = 0V, 5.5V, TA = +25NC -1 +1 FA

DVDD

V

= 5.5V, TA = +25°C 1 mA

OUT

V

= 1.65V, IOL = 3mA

DVDD

V

= 2.0V, VIN = 0V, 2.0V; TA = +25°C -25 +25 FA

DVDD

SPKLVDD

= V

SPKRVDD

DVDDS1

DVDDS2

DVDDS2

= 3.7V, TA = T

MIN

to T

- 0.4

-1 +1 FA

0.7 x

0.29 x

DVDDS2

- 0.4

-1 +1 FA

0.7 x

DVDD

0.3 x

DVDD

0.2 x

DVDD

0.65 x
DVDD

0.35 x
DVDD

MAX

, unless

V

V

V

V

V

V

V

V

V

20

Stereo Audio CODEC

with FlexSound Technology

DIGITAL INPUT/OUTPUT CHARACTERISTICS (continued)

(V

= V

AVDD

otherwise noted. Typical values are at T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DIGMICCLK—OUTPUT

Output Low Voltage V

Output High Voltage V

INPUT CLOCK CHARACTERISTICS

(V

= V

AVDD

noted. Typical values are at T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MCLK Input Frequency f

MCLK Input Duty Cycle

Maximum MCLK Input Jitter 100 ps

LRCLK Sample Rate (Note 8)

DAI1 LRCLK Average Frequency
Error (Note 9)

DAI2 LRCLK Average Frequency
Error (Note 9)

PLL Lock Time

Maximum LRCLK Jitter to Maintain
PLL Lock

Soft-Start/Stop Time 10 ms

HPVDD

HPVDD

= V

= V

DVDD

DVDD

= V

DVDDS1

= V

DVDDS1

= +25NC.) (Note 1)

A

= V

= +25NC.) (Note 1)

A

OL

OH

= V

MCLK

= 1.65V to 2.0V, V

DVDDS2

V

= 1.65V, IOL = 1mA 0.4 V

DVDD

V

= 1.65V, IOH = 1mA

DVDD

= +1.8V, V

DVDDS2

PSCLK = 01 40 50 60
PSCLK = 10 or 11 30 70

DHF_ = 0 8 48
DHF_ = 1 48 96
FREQ1 = 0x8 to 0xF 0 0
FREQ1 = 0x0 -0.025 +0.025

Rapid lock mode 2 7
Nonrapid lock mode 12 25

SPKLVDD

SPKLVDD

= V

= V

SPKRVDD

SPKRVDD

= 3.7V, TA = T

= 3.7V, TA = T

DVDD -

0.4

10 60 MHz

-0.025 +0.025 %

MIN

to T

to T

MIN

MAX

MAX

, unless otherwise

100 ns

, unless

kHz

MAX9888

V

%

RMS

%

ms

21

Stereo Audio CODEC
with FlexSound Technology

AUDIO INTERFACE TIMING CHARACTERISTICS

(V

= V

AVDD

noted. Typical values are at T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BCLK Cycle Time t
BCLK High Time t
BCLK Low Time t

MAX9888

BCLK or LRCLK Rise and Fall Time t
SDIN to BCLK Setup Time t
LRCLK to BCLK Setup Time t
SDIN to BCLK Hold Time t
LRCLK to BCLK Hold Time t

Minimum Delay Time from LSB
BCLK Falling Edge to
High-Impedance State

LRCLK Rising Edge to SDOUT
MSB Delay

BCLK to SDOUT Delay t

Delay Time from BCLK to LRCLK t

Delay Time from LRCLK to BCLK
After LSB

HPVDD

= V

DVDD

= V

= +25NC.) (Note 1)

A

DVDDS1

SYNCSET

SYNCHOLD

t

HIZOUT

t

SYNCTXCL

CLKSYNC

t

ENDSYNC

= V

BCLK

BCLKH

BCLKL

, t

R

SETUP

HOLD

CLKTX

= 1.65V, V

DVDDS2

SPKLVDD

Slave mode 90 ns
Slave mode 20 ns
Slave mode 20 ns
Master mode, CL = 15pF ns

F

Slave mode 20 ns

Slave mode 20 ns

Master mode, TDM_ = 1 42 ns

= 30pF, TDM_ = 1, FSW_ = 1 50 ns

CL = 30pF

Master
mode

Master
mode

TDM_ = 1, BCLK rising edge 50
TDM_ = 0 50
TDM_ = 1 -15 +15

TDM_ = 0

TDM_ = 1, FSW_ = 1 20 ns

= V

SPKRVDD

= 2.8V, TA = T

20 ns

20 ns

MIN

to T

, unless otherwise

MAX

0.8 x

t

BCLKL

ns

ns

t

t

CLKSYNC

t

HIZOUT

F

t

CLKTX

HI-Z MSB

MASTER MODE

t

SETUPtHOLD

MSBLSB

BCLK

(OUTPUT)

LRCLK

(OUTPUT)

SDOUT

(OUTPUT)

SDIN

(INPUT)

t

R

LSB

Figure 1. Non-TDM Audio Interface Timing Diagrams (TDM_ = 0)

22

BCLK

(INPUT)

LRCLK

(INPUT)

SDOUT

(OUTPUT)

SDIN

(INPUT)

t

SYNCSET

t

HIZOUT

LSB HI-Z

LSB

SLAVE MODE

t

BCLKH

t

CLKTX

t

BCLK

t

SETUPtHOLD

MSB

t

MSB

BCLKL

with FlexSound Technology

t

F

BCLK (OUTPUT)

t

CLKSYNC

LRCLK (OUTPUT)

t

t

SDOUT (OUTPUT)

SDIN (INPUT)

HIZOUT

LSB

CLKTX

HI-ZLSB

MASTER MODE SLAVE MODE

Figure 2. TDM Audio Interface Timing Diagram (TDM_ = 1, FSW_ = 0)

t

R

t

CLKSYNC

MSB

MSB

t

SETUP

t

HOLD

SDOUT (OUTPUT)

Stereo Audio CODEC

t

BCLK

t

BCLK (INPUT)

LRCLK (INPUT)

SDIN (INPUT)

t

SYNCSET

t

HIZOUT

LSB

t

CLKTX

HI-ZLSB

BCLKH

t

SYNCHOLD

MSB

MSB

t

SETUP

t

BCLKL

t

MAX9888

HOLD

BCLK (OUTPUT)

LRCLK (OUTPUT)

SDOUT (OUTPUT)

SDIN (INPUT)

t

F

t

ENDSY NC

t

HIZOUT

LSB MSB

t

SYNCTX

HI-ZLSB MSB

MASTER MODE

t

R

t

CLKSYNC

t

CLKTX

t

SETUP

t

HOLD

BCLK (INPUT)

LRCLK (INPUT)

SDOUT (OUTPUT)

SDIN (INPUT)

Figure 3. TDM Audio Interface Timing Diagram (TDM_ = 1, FSW_ = 1)

DIGITAL MICROPHONE TIMING CHARACTERSTICS

(V

= V

AVDD

noted. Typical values are at T

DIGMICCLK Frequency f

DIGMICDATA to DIGMICCLK
Setup Time

DIGMICDATA to DIGMICCLK
Hold Time

HPVDD

= V

DVDD

= V

= +25NC.) (Note 1)

A

DVDDS1

= V

DVDDS2

= 2.0V, V

SPKLVDD

= V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MICCLK

t

SU,MIC

t

HD,MIC

MICCLK = 00 MCLK/8
MICCLK = 01 MCLK/6

Either clock edge 20 ns

Either clock edge 0 ns

t

HIZOUT

SPKRVDD

t

HI-ZLSB

LSB

= 2.8V, TA = T

SYNCTX

SLAVE MODE

MIN

t

BCLKH

MSB

to T

t

BCLK

t

CLKTX

MSB

t

SETUP

, unless otherwise

MAX

t

BCLKL

t

HOLD

MHz

23

Stereo Audio CODEC
with FlexSound Technology

1/f

MICCLK

t

HD,MICtSU,MIC

t

HD,MICtSU,MIC

LEFT RIGHT LEFT RIGHT

MAX9888

Figure 4. Digital Microphone Timing Diagram

I2C TIMING CHARACTERSTICS

(V

= V

AVDD

otherwise noted. Typical values are at T

Serial-Clock Frequency f

Bus Free Time Between STOP and
START Conditions

Hold Time (Repeated) START
Condition

SCL Pulse-Width Low t
SCL Pulse-Width High t

Setup Time for a Repeated START
Condition

Data Hold Time t
Data Setup Time t

SDA and SCL Receiving Rise Time t

SDA and SCL Receiving Fall Time t

SDA Transmitting Fall Time t

Setup Time for STOP Condition t
Bus Capacitance C
Pulse Width of Suppressed Spike t

HPVDD

= V

DVDD

= V

DVDDS1

= V

= +25NC.) (Note 1)

A

= 1.65V to 2.0V, V

DVDDS2

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL

t

BUF

t

HD,STA

LOW

HIGH

t

SU,STA

HD,DAT

SU,DAT

SU,STO

Guaranteed by SCL pulse-width low and
high

RPU = 475I, CB = 100pF, 400pF

(Note 10)

R

(Note 10)

F

RPU = 475I, CB = 100pF, 400pF (Note 10)

F

Guaranteed by SDA transmitting fall time 400 pF

B

SP

SPKLVDD

= V

SPKRVDD

= 3.7V, TA = T

MIN

to T

MAX

0 400 kHz

1.3

0.6

1.3

0.6

0.6

0 900 ns

100 ns

20 +

0.1C

20 +

0.1C

20 +

0.05C

B

B

B

300 ns

300 ns

250 ns

0.6

0 50 ns

, unless

Fs

Fs

Fs
Fs

Fs

Fs

24

SDA

t

LOW

t

SU,DAT

Stereo Audio CODEC

with FlexSound Technology

MAX9888

t

t

t

HD,DAT

SU,STA

t

HD,STA

t

SP

t

SU,STO

BUF

t

HIGH

t

t

R

F

REPEATED START CONDITION

STOP

CONDITION

START

CONDITION

Figure 5. I

SCL

t

HD,STA

START CONDITION

2

C Interface Timing Diagram

Note 1: The IC is 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.
Note 2:

Analog supply current = I

+ I

DVDDS1

+ I

DVDDS2

.

AVDD

+ I

. Speaker supply current = I

HPVDD

SPKLVDD

+ I

SPKRVDD

. Digital supply current = I

DVDD

Note 3: Clocking all zeros into the DAC. Slave mode.
Note 4: Dynamic range measured using the EIAJ method. -60dBFS, 1kHz output signal, A-weighted and normalized to 0dBFS.

f = 20Hz to 20kHz.

Note 5: Gain measured relative to the 0dB setting.
Note 6: The filter specification is accurate only for synchronous clocking modes, where NI is a multiple of 0x1000.
Note 7: 0dBFS for DAC input. 1V

for INA/INB inputs.

P-P

Note 8: LRCLK may be any rate in the indicated range. Asynchronous or noninteger MCLK/LRCLK ratios may exhibit some full-

scale performance degradation compared to synchronous integer related MCLK/LRCLK ratios.

Note 9: In master-mode operation, the accuracy of the MCLK input proportionally determines the accuracy of the sample clock rate.
Note 10: CB is in pF.

Power Consumption

(V

= V

AVDD

DAC Playback 48kHz Stereo HP

DAC à HP
24-bit, music filters

DAC Playback 48kHz Stereo HP

DAC à HP
24-bit, music filters, 0.1mW/channel,
R

= 32I

HP

DAC Playback 48kHz Stereo HP

DAC à HP
24-bit, music filters, ALC enabled

HPVDD

= V

MODE

DVDD

= V

DVDDS1

= V

DVDDS2

I

AVDD

(mA)

= +1.8V, V

I

HPVDD

(mA)

SPKLVDD

= V

SPKRVDD

I

SPKLVDD

I

SPKRVDD

(mA)

+

= 3.7V)

I

DVDD

(mA)

I

DVDDS1

+ I

(mA)

DVDDS2

1.35 1.37 1.65 2.91 0.02 16.25

1.35 4.19 1.65 3.02 0.02 21.55

1.35 1.37 1.65 2.96 0.02 16.36

POWER

(mW)

25

Stereo Audio CODEC
with FlexSound Technology

Power Consumption (continued)

(V

= V

AVDD

DAC Playback 48kHz Stereo HP

DAC à HP

MAX9888

24-bit, music filters, EQ enabled

DAC Playback 48kHz Stereo HP

DAC à HP
24-bit, music filters, digital mixing

DAC Playback 44.1kHz Stereo HP

DAC à HP
24-bit, music filters

DAC Playback 8kHz Stereo HP

DAC à HP
16-bit, voice filters

DAC Playback 8kHz Mono HP

DAC à HP
16-bit, voice filters

DAC Playback 48kHz Stereo SPK

DAC à SPK
24-bit, music filters

DAC Playback 48kHz Mono SPK

DAC à SPK
24-bit, music filters

Line Stereo Record 48kHz

INA à ADC
16-bit, music filters

Line Stereo Record 48kHz, Stereo HP

INA à ADC
INA à HP
16-bit, music filters

Line Stereo Record 48kHz, Stereo SPK

INA à ADC
INA à SPK
16-bit, music filters

Differential Line Record 48kHz

INA à ADCL
INB à ADCR
Differential input

Microphone Stereo Record 48kHz

MIC1/2 à ADC
16-bit, music filters

Microphone Stereo Record 8kHz

MIC1/2 à ADC
16-bit, voice filters

HPVDD

= V

MODE

DVDD

= V

DVDDS1

= V

= +1.8V, V

DVDDS2

I

AVDD

(mA)

1.35 1.36 1.65 3.27 0.02 16.90

1.34 1.36 1.65 2.91 0.02 16.27

1.35 1.37 1.69 2.85 0.02 16.29

1.35 1.37 1.65 1.46 0.01 13.65

1.00 0.71 1.01 1.36 0.01 9.27

1.83 0.02 8.22 2.92 0.02 39.09

1.25 0.02 4.31 2.82 0.02 23.32

9.91 0.02 0.39 1.62 0.11 22.48

10.64 2.65 0.66 1.63 0.11 29.51

10.97

10.49 0.02 0.39 1.63 0.16 23.58

10.88 0.03 0.69 1.62 0.17 25.43

10.77 0.02 0.64 1.03 0.06 23.78

SPKLVDD

I

HPVDD

(mA)

0.03 7.15 1.63 0.12 49.50

= V

SPKRVDD

I

SPKLVDD

I

SPKRVDD

(mA)

+

= 3.7V)

I

DVDD

(mA)

I

DVDDS1

+ I

(mA)

DVDDS2

POWER

(mW)

26

Stereo Audio CODEC

with FlexSound Technology

Power Consumption (continued)

(V

AVDD

= V

HPVDD

= V

DVDD

= V

DVDDS1

= V

DVDDS2

= +1.8V, V

SPKLVDD

= V

SPKRVDD

= 3.7V)

MAX9888

MODE

Microphone Mono Record 48kHz

MIC1/2 à ADC
16-bit, music filters

Microphone Mono Record 8kHz

MIC1/2 à ADC
16-bit, voice filters

Microphone Mono Record 8kHz

MIC1/2 à ADC
16-bit, voice filters, AGC

Microphone Mono Record 8kHz

MIC1/2 à ADC
16-bit, voice filters, AGC, noise gate

Full-Duplex 48kHz Stereo HP

MIC1/2 à ADC
DAC à HP
24-bit, music filters

Full-Duplex 8kHz Mono RCV

MIC1 à ADC
DAC à REC
16-bit, voice filters

Full-Duplex 8kHz Mono HP

MIC1 à ADC
DAC à HP
16-bit, voice filters

Full-Duplex 8kHz Stereo HP

MIC1/2 à ADC
DAC à HP
16-bit, voice filters

Line Playback Stereo HP

INA à HP
Single-ended inputs

Line Playback Stereo SPK

INA à SPK
Single-ended inputs

Line Playback Mono SPK

INA à SPK
Single-ended inputs

Differential Line Playback Stereo HP

INA à HPL
INB à HPR
Differential input

(mA)

+

I

DVDD

(mA)

I

DVDDS1

+ I

(mA)

DVDDS2

POWER

(mW)

I

I

AVDD

(mA)

6.01 0.02 0.66 1.37 0.10 15.97

5.95 0.02 0.64 0.98 0.04 14.94

5.95 0.02 0.64 0.98 0.04 15.00

5.96 0.02 0.64 0.98 0.04 14.98

11.38 1.37 1.70 3.56 0.19 36.06

6.35 0.02 1.98 1.47 0.03 21.47

6.09 0.71 1.01 1.46 0.03 18.72

10.92 1.37 1.09 1.51 0.05 28.95

1.89 2.65 0.58 0.03 0.01 10.41

2.21 0.02 7.05 0.04 0.02 30.19

1.68 0.02 3.70 0.03 0.02 16.90

2.46 2.65 0.58 0.03 0.01 11.42

I

HPVDD

(mA)

SPKLVDD

I

SPKRVDD

27

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

SPK_

Microphone to ADC

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 13MHz

-10
LRCLK = 8kHz

FREQ MODE

-20
V

= 1V

IN

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100

P-P

AV

= 0dB

MICPRE_

10 10,000

FREQUENCY (Hz)

1000100

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 12.288MHz

-10
LRCLK = 96kHz

NI MODE

-20
V

= 1V

IN

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100

P-P

AV

= 0dB

MICPRE_

10 100,000

FREQUENCY (Hz)

10,0001000100

MAX9888 toc01

THD+N RATIO (dB)

MAX9888 toc04

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 13MHz

-10

LRCLK = 44.1kHz
PLL MODE

-20
V

= 1V

IN

P-P

AV

MICPRE_

= 0dB

10,0001000100

FREQUENCY (Hz)

-30

-40

-50

-60

-70

-80

-90

10 100,000

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 13MHz

-10
LRCLK = 8kHz

FREQ MODE

-20
V

= 0.1V

IN

AV

MICPRE_

P-P

= +20dB

FREQUENCY (Hz)

1000100

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100
10 10,000

MAX9888 toc02

THD+N RATIO (dB)

MAX9888 toc05

THD+N RATIO (dB)

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 12.288MHz

-10
LRCLK = 48kHz

NI MODE

-20
V

= 1V

IN

-30

-40

-50

-60

-70

-80

-90

-100

P-P

AV

= 0dB

MICPRE_

10 100,000

FREQUENCY (Hz)

10,0001000100

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MIC TO ADC)

0

MCLK = 13MHz

-10
LRCLK = 8kHz

FREQ MODE

-20
V

= 0.032V

IN

MICPRE_

P-P

= +30dB

FREQUENCY (Hz)

1000100

-30
AV

-40

-50

-60

-70

-80

-90

-100
10 10,000

MAX9888 toc03

MAX9888 toc06

28

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

GAIN vs. FREQUENCY (MIC TO ADC)

5

-5

-15

-25

-35

-45
MCLK = 13MHz

-55
LRCLK = 8kHz

NORMALIZED GAIN (dB)

FREQ MODE

-65
VIN = 1V

-75

-85

P-P

AV

= 0dB

MICPRE_

10 10,000

MODE = 1

MODE = 0

1000100

FREQUENCY (Hz)

FFT, 0dBFS (MIC TO ADC)

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

MCLK = 13MHz
LRCLK = 8kHz
FREQ MODE
AV

MICPRE_

= 0dB

MAX9888 toc07

MAX9888 toc10

COMMON-MODE REJECTION

RATIO vs. FREQUENCY (MIC TO ADC)

90

80

AV

70

60

50

40

CMRR (dB)

30

20

10

V

OUT, DIFF

0

10 100,000

= +30dB

MICPRE_

AV

MICPRE_

AV

MICPRE_

= 0dBFS

FREQUENCY (Hz)

= +20dB

= 0dB

10,0001000100

FFT, -60dBFS (MIC TO ADC)

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

MCLK = 13MHz
LRCLK = 8kHz
FREQ MODE
AV

MICPRE_

= 0dB

MAX9888 toc08

PSRR (dB)

MAX9888 toc11

AMPLITUDE (dBV)

POWER-SUPPLY REJECTION

RATIO vs. FREQUENCY (MIC TO ADC)

0

V

= 200mV

RIPPLE

INPUTS AC GROUNDED

-20

-40

-60

-80

-100

-120
10 100,000

P-P

RIPPLE ON AVDD,

DVDD, HPVDD

RIPPLE ON

SPKLVDD, SPKRVDD

10,0001000100

FREQUENCY (Hz)

FFT, 0dBFS (MIC TO ADC)

0

-20

-40

-60

-80

-100

MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE
AV

MICPRE_

MAX9888 toc09

MAX9888 toc12

= 0dB

-120

-140
0 4000

FREQUENCY (Hz)

-120

-140

350030002500200015001000500

0 4000

FREQUENCY (Hz)

350030002500200015001000500

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

29

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

HPVSS

= 0dB,

FFT, -60dBFS (MIC TO ADC)

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE
AV

MICPRE_

FFT, -60dBFS (MIC TO ADC)

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
AV

MICPRE_

0

MAX9888 toc13

= 0dB

15,00010,0005000

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
AV

= 0dB

MICPRE_

15,00010,0005000

MAX9888 toc14

FFT, 0dBFS (MIC TO ADC)

FFT, 0dBFS (MIC TO ADC)

= 0dB

MAX9888 toc15

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

MCLK = 12.288MHz
LRCLK = 96kHz
NI MODE
AV

= 0dB

MICPRE_

MAX9888 toc16

30

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

FFT, -60dBFS (MIC TO ADC)

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

MCLK = 12.288MHz
LRCLK = 96kHz
NI MODE
AV

MICPRE_

15,00010,0005000

= 0dB

SCL

2V/div

ADC

OUTPUT

0.5V/div

MAX9888 toc17

SCL

2V/div

ADC

OUTPUT

0.5V/div

SOFTWARE TURN-ON/OFF RESPONSE

(MIC TO ADC)

MAX9888 toc19

ADC ENABLE/DISABLE RESPONSE

(MIC TO ADC)

10ms/div

MAX9888 toc18

10ms/div

31

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

Line to ADC

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (LINE TO ADC)

0

-10

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90
10 100,000

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
V

IN

AV
C

IN

FREQUENCY (Hz)

= 1.4V

PGAIN_

= 1µF

10,0001000100

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY (LINE TO ADC)

0

-10

-20

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100
10 100,000

P-P

= -6dB

FREQUENCY (Hz)

MAX9888 toc20

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
V

IN

EXTERNAL GAIN MODE

RIN = 56kI, CIN = 1µF

-10

-20

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100

= 1V

RMS

10,0001000100

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY (LINE TO ADC)

0

10 100,000

MAX9888 toc23

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
V

IN

C

IN

AV

FREQUENCY (Hz)

= 1V

P-P

= 1µF

= 0dB

PGAIN_

10,0001000100

0

-20

-40

-60

PSRR (dB)

-80

-100

-120
10 100,000

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (LINE TO ADC)

0

-10

MAX9888 toc21

-20

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100
10 100,000

FREQUENCY (Hz)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (LINE TO ADC)

V

= 200mV

INPUTS AC GROUNDED

RIPPLE ON AVDD,

DVDD, HPVDD

FREQUENCY (Hz)

RIPPLE

SPKLVDD, SPKRVDD

P-P

RIPPLE ON

10,0001000100

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
V

= 0.1V

IN

P-P

AV

= +20dB

PGAIN_

10,0001000100

MAX9888 toc24

MAX9888 toc22

32

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

SPK_

Digital Loopback

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

(SDINS1 TO SDOUTS2 DIGITAL LOOPBACK)

FFT, 0dBFS

0

-20

-40

-60

-80

-100

AMPLITUDE (dBFS)

-120

-140

-160

-180
0 20,000

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

15,00010,0005000

FREQUENCY (Hz)

MAX9888 toc25

(SDINS1 TO SDOUTS2 DIGITAL LOOPBACK)

FFT, -60dBFS

0

-20

-40

-60

-80

-100

AMPLITUDE (dBFS)

-120

-140

-160

-180
0 20,000

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

15,00010,0005000

FREQUENCY (Hz)

MAX9888 toc26

33

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

SPK_

Analog Loopback

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

(LINE TO ADC TO DAC TO HEADPHONE)

0

MCLK = 13MHz

-10

LRCLK = 44.1kHz
PLL MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

= 32I, CIN = 1µF

R

HP

P

= 0.025W

OUT

P

= 0.01W

OUT

10 100,000

FREQUENCY (Hz)

10,0001000100

FFT, -60dBFS

(LINE TO ADC TO DAC TO HEADPHONE)

0

-20

-40

-60

MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE

= 32I

R

HP

MAX9888 toc27

THD+N RATIO (dB)

MAX9888 toc30

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

(LINE TO ADC TO DAC TO HEADPHONE )

0

MCLK = 12.288MHz

-10

LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

-60

-70

-80

-90

= 32I, CIN = 1µF

R

HP

P

= 0.025W

OUT

P

= 0.01W

OUT

10 100,000

FREQUENCY (Hz)

10,0001000100

FFT, 0dBFS

(LINE TO ADC TO DAC TO HEADPHONE)

0

-20

-40

-60

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

= 32I

R

HP

MAX9888 toc28

AMPLITUDE (dBV)

MAX9888 toc31

(LINE TO ADC TO DAC TO HEADPHONE)

FFT, 0dBFS

0

-20

-40

-60

-80

-100

-120

-140
0 20,000

FREQUENCY (Hz)

MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE

= 32I

R

HP

15,00010,0005000

FFT, -60dBFS

(LINE TO ADC TO DAC TO HEADPHONE)

0

-20

-40

-60

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

= 32I

R

HP

MAX9888 toc29

MAX9888 toc32

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

34

-80

AMPLITUDE (dBV)

-100

-120

15,00010,0005000

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

DACGAIN

SPK_

DAC to Receiver

= V

SPKRVDD

= C

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

TOTAL HARMONIC DISTORTION

vs. OUTPUT POWER (DAC TO RECEIVER)

0

MCLK = 13MHz

-10

LRCLK = 8kHz
FREQ MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

= 32I

R

REC

AV

= +8dB

REC

f = 3000Hz

f = 1000Hz

f = 100Hz

0 0.12

OUTPUT POWER (W)

GAIN vs. FREQUENCY

(DAC TO RECEIVER)

5

MCLK = 13MHz

4

LRCLK = 8kHz
FREQ MODE

3

= 32I

R

REC

2

1

0

-1

-2

NORMALIZED GAIN (dB)

-3

-4

-5
10 10,000

FREQUENCY (Hz)

1000100

TOTAL HARMONIC DISTORTION

vs. FREQUENCY (DAC TO RECEIVER)

0

MCLK = 13MHz

-10

MAX9888 toc33

0.100.080.060.040.02

LRCLK = 8kHz
FREQ MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

= 32I

R

REC

P

= 0.05W

OUT

P

= 0.025W

OUT

10 10,000

FREQUENCY (Hz)

1000100

MAX9888 toc34

POWER CONSUMPTION vs. OUTPUT

POWER (DAC TO RECEIVER)

0.25
MCLK = 13MHz

MAX9888 toc36

LRCLK = 8kHz
FREQ MODE

0.20

0.15

0.10

POWER CONSUMPTION (W)

0.05

= 32I

R

REC

AV

= +8dB

REC

0

0 0.12

OUTPUT POWER (W)

MAX9888 toc37

0.100.080.060.040.02

OUTPUT POWER vs. SUPPLY VOLTAGE

(DAC TO RECEIVER)

140

130

120

110

100

90

80

OUTPUT POWER PER CHANNEL (mW)

70

60

2.5 5.5

THD+N = 10%

THD+N = 1%

SUPPLY VOLTAGE (V)

MCLK = 13MHz
LRCLK = 8kHz
FREQ MODE
R

REC

AV

REC

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (DAC TO RECEIVER)

0

V

= 200mV

RIPPLE

ALL ZEROS AT INPUT

-20

-40

PSRR (dB)

-60

-80

-100
10 100,000

P-P

RIPPLE ON SPKLVDD,

SPKRVDD

RIPPLE ON AVDD,

DVDD, HPVDD

10,0001000100

FREQUENCY (Hz)

MAX9888 toc35

= 32I

= +8dB

5.04.53.0 3.5 4.0

MAX9888 toc38

35

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

HPVSS

= 0dB,

SCL

2V/div

RECEIVER

OUTPUT

1V/div

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

SOFTWARE TURN-ON/OFF RESPONSE

(DAC TO RECEIVER, VSEN = 0)

10ms/div

FFT, -60dBFS (DAC TO RECEIVER)

0

MCLK = 13MHz
LRCLK = 8kHz
FREQ MODE
R

REC

MAX9888 toc39

= 32I

RECEIVER

OUTPUT

MAX9888 toc42

AMPLITUDE (dBm)

SOFTWARE TURN-ON/OFF RESPONSE

(DAC TO RECEIVER, VSEN = 1)

SCL

2V/div

1V/div

10ms/div

WIDEBAND FFT, 0dBFS

(DAC TO RECEIVER)

0

-20

-40

-60

-80

-100

MAX9888 toc40

MCLK = 13MHz
LRCLK = 8kHz
PLL MODE

= 32I

R

REC

AMPLITUDE (dBV)

MAX9888 toc43

AMPLITUDE (dBm)

FFT, 0dBFS (DAC TO RECEIVER)

0

-20

-40

-60

-80

-100

-120

-140
0 20,000

FREQUENCY (Hz)

MCLK = 13MHz
LRCLK = 8kHz
FREQ MODE
R

REC

15,00010,0005000

WIDEBAND FFT, -60dBFS

(DAC TO RECEIVER)

0

-20

-40

-60

-80

-100

MCLK = 13MHz
LRCLK = 8kHz
PLL MODE
R

REC

= 32I

MAX9888 toc41

MAX9888 toc44

= 32I

-140
0 20,000

FREQUENCY (Hz)

36

15,00010,0005000

-120
0 10,000

FREQUENCY (kHz)

1000100101

-120
0 10,000

FREQUENCY (kHz)

1000100101

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

SPK_

Line to Receiver

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

(LINE TO RECEIVER)

0

-10

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80
0 0.10

f = 6000Hz

f = 100Hz

OUTPUT POWER (W)

R
AV

f = 1000Hz

GAIN vs. FREQUENCY (LINE TO RECEIVER)

5

R

= 32I

REC

4

= 1µF

C

IN

3

2

1

0

-1

-2

NORMALIZED GAIN (dB)

-3

-4

-5
10 100,000

FREQUENCY (Hz)

10,0001000100

REC

REC

0.080.060.02 0.04

= 32I

= +8dB

MAX9888 toc45

MAX9888 toc47

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

(LINE TO RECEIVER)

0

R

= 32I

REC

-10

= 1µF

C

IN

AV

= +8dB

REC

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90
10 100,000

P

= 0.05W

OUT

P

OUT

FREQUENCY (Hz)

= 0.025W

10,0001000100

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (LINE TO RECEIVER)

0

V

= 200mV

RIPPLE

INPUT AC GROUNDED

-20

-40

PSRR (dB)

-60

-80

-100

RIPPLE ON SPKLVDD,

10 100,000

P-P

SPKRVDD

RIPPLE ON AVDD,

DVDD, HPVDD

10,0001000100

FREQUENCY (Hz)

MAX9888 toc46

MAX9888 toc48

37

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

DAC to Speaker

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 4.2V

SPK_VDD

-10

MCLK = 12.288MHz, LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

= 8I + 68µH

Z

SPK

AV

= +8dB

SPK_

f = 6000Hz

f = 1000Hz

f = 100Hz

0 1.2

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 4.2V

SPK_VDD

-10

MCLK = 12.288MHz, LRCLK = 48kHz
NI MODE

-20

Z

= 4I + 33µH

SPK

-30

AV

= +8dB

SPK_

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

f = 6000Hz

f = 1000Hz

f = 100Hz

OUTPUT POWER (W)

1.00.80.60.40.2

2.01.51.00.50 2.5

MAX9888 toc49

THD+N RATIO (dB)

MAX9888 toc52

THD+N RATIO (dB)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 3.7V

SPK_VDD

-10

MCLK = 12.288MHz, LRCLK = 48kHz
NI MODE

-20

Z

= 8I + 68µH

SPK

AV

= +8dB

SPK_

-30

-40

-50

-60

-70

-80

f = 6000Hz

f = 1000Hz

f = 100Hz

0.80.60.40.20 1.0

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 3.7V

SPK_VDD

-10

MCLK = 12.288MHz, LRCLK = 48kHz
NI MODE

-20

Z

= 4I + 33µH

SPK

-30

AV

= +8dB

SPK_

-40

-50

-60

-70

-80

-90

f = 6000Hz

f = 1000Hz

f = 100Hz

1.51.00.50 2.0

OUTPUT POWER (W)

MAX9888 toc50

THD+N RATIO (dB)

MAX9888 toc53

THD+N RATIO (dB)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 3.V

SPK_VDD

-10

MCLK = 12.288MHz, LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

-60

-70

-80

= 8I + 68µH

Z

SPK

AV

SPK_

f = 100Hz

= +8dB

f = 6000Hz

f = 1000Hz

0.50.40.30.20.10 0.6

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO SPEAKER)

0

V

= 3V

SPK_VDD

-10

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

-30

Z

= 4I + 33µH

SPK

= +8dB

AV

SPK_

-40

f = 6000Hz

-50

-60

-70

-80

f = 100Hz

-90
0 1.4

f = 1000Hz

1.21.00.6 0.80.40.2

OUTPUT POWER (W)

MAX9888 toc51

MAX9888 toc54

38

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO SPEAKER)

0

V

= 4.2V

SPK_VDD

-10

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

-30

Z

= 8I + 68µH

SPK

= +8dB

AV

SPK_

-40

-50

THD+N RATIO (dB)

-60

P

= 0.25W

OUT

-70

-80

P

= 0.55W

-90

OUT

10 100,000

FREQUENCY (Hz)

10,0001000100

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO SPEAKER)

0

V

= 3.7V

SPK_VDD

-10

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

-30

Z

= 4I + 33µH

SPK

P

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

P

= 0.5W

OUT

10 100,000

= 1.0W

OUT

FREQUENCY (Hz)

10,0001000100

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO SPEAKER)

0

V

SPK_VDD

-10

MAX9888 toc55

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

-30

Z

= 8I + 68µH

SPK

AV

SPK_

-40

-50

THD+N RATIO (dB)

-60

P

= 0.25W

OUT

-70

-80

P

= 0.55W

OUT

-90
10 100,000

OUTPUT POWER vs. SUPPLY VOLTAGE

2200

MCLK = 12.288MHz,

2000

MAX9888 toc58

LRCLK = 48kHz
NI MODE

1800

1600

1400

1200

1000

800

OUTPUT POWER PER CHANNEL (mW)

600

400

= 8I + 68µH

Z

SPK

2.5 5.5

= 3.7V

= +8dB

FREQUENCY (Hz)

(DAC TO SPEAKER)

THD+N = 10%

THD+N = 10%THD+N = 10%

THD+N = 10%

SUPPLY VOLTAGE (V)

10,0001000100

THD+N = 1%

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO SPEAKER)

0

V

= 4.2V

SPK_VDD

-10

MAX9888 toc56

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

-30

Z

= 4I + 33µH

SPK

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

P

OUT

10 100,000

= 0.5W

FREQUENCY (Hz)

P

= 1.0W

OUT

10,0001000100

MAX9888 toc57

OUTPUT POWER vs. SUPPLY VOLTAGE

(DAC TO SPEAKER)

3500

MCLK = 12.288MHz,

3000

MAX9888 toc59

5.04.54.03.53.0

LRCLK = 48kHz
NI MODE

= 4I + 33µH

Z

2500

SPK

2000

1500

1000

OUTPUT POWER PER CHANNEL (mW)

500

0

THD+N = 10%

SUPPLY VOLTAGE (V)

MAX9888 toc60

THD+N = 1%

5.04.54.03.53.02.5 5.5

39

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

HPVSS

= 0dB,

GAIN vs. FREQUENCY

(DAC TO SPEAKER)

5

MCLK = 12.288MHz,

4

LRCLK = 48kHz

3

NI MODE
Z

= 8I + 68µH

SPK

2

1

0

-1

-2

NORMALIZED GAIN (dB)

-3

-4

-5

FREQUENCY (Hz)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

(DAC TO SPEAKER)

30

MCLK = 12.288MHz,
LRCLK = 48kHz

25

Z

= 8I + 68µH

SPK

NI MODE

20

AV

= +8dB

SPK_

ALL ZEROS AT INPUT

15

10

10,000100010010 100,000

MAX9888 toc61

MAX9888 toc64

EFFICIENCY vs. OUTPUT POWER

(DAC TO SPEAKER)

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

Z

SPK

OUTPUT POWER PER CHANNEL (W)

Z

Z

SPK

SPK

= 8I + 68µH

0.5 1.0 1.5 2.00 2.5

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (DAC TO SPEAKER)

0

V

= 200mV

-20

-40

PSRR (dB)

-60

RIPPLE

P-P

RIPPLE ON SPKLVDD,

SPKRVDD

= 4I + 33µH

= 4I + 33µH

V

= 4.2V

SPK_VDD

MCLK = 12.288MHz,
LRCLK = 48kHz
NI MODE
AV

= +8dB

SPK_

MAX9888 toc62

MAX9888 toc65

EFFICIENCY vs. OUTPUT POWER

(DAC TO SPEAKER)

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

Z

SPK

OUTPUT POWER PER CHANNEL (W)

Z

= 8I + 68µH

= 4I + 33µH

SPK

V

SPK_VDD

MCLK = 12.288MHz,
LRCLK = 48kHz
NI MODE
AV

= +8dB

SPK_

POWER-SUPPLY REJECTION RATIO

vs. SUPPLY VOLTAGE (DAC TO SPEAKER)

0

RIPPLE ON SPKLVDD, SPKRVDD

= 200mV

V

-20

-40

PSRR (dB)

-60

RIPPLE

f = 1kHz

P-P

= 3.7V

1.20.8 1.00.4 0.60.20 1.6

1.4

MAX9888 toc63

MAX9888 toc66

SPK_VDD SUPPLY CURRENT (mA)

5

0

2.5 5.5
SPK_VDD SUPPLY VOLTAGE (V)

40

-80

5.04.54.03.53.0

-100

RIPPLE ON AVDD,

DVDD, HPVDD

10,000100010010 100,000

FREQUENCY (Hz)

-80

-100

4.54.03.53.02.5 5.5

SUPPLY VOLTAGE (V)

5.0

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

CROSSTALK vs. FREQUENCY

(DAC TO SPEAKER)

0

MCLK = 12.288MHz,

-10

LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

CROSSTALK (dB)

-60

-70

-80

-90

= 8I + 68µH

Z

SPK

10 100,000

FREQUENCY (Hz)

10,0001000100

FFT, -60dBFS (DAC TO SPEAKER)

0

MCLK = 12.288MHz,
LRCLK = 48kHz

-20

NI MODE

= 8I + 68µH

Z

SPK

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

MAX9888 toc67

SPEAKER

OUTPUT

MAX9888 toc70

SOFTWARE TURN-ON/ OFF RESPONSE

(DAC TO SPEAKER, VSEN = 0)

SCL

2V/div

1V/div

10ms/div

FFT, -60dBFS (DAC TO SPEAKER)

0

MCLK = 13MHz,
LRCLK = 44.1kHz

-20

PLL MODE

= 8I + 68µH

Z

SPK

-40

-60

-80

AMPLITUDE (dbV)

-100

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

MAX9888 toc68

SPEAKER

OUTPUT

MAX9888 toc71

SOFTWARE TURN-ON/ OFF RESPONSE

(DAC TO SPEAKER, VSEN = 1)

SCL

2V/div

1V/div

10ms/div

WIDEBAND FFT

(DAC TO SPEAKER)

20

10

0

-10

-20

-30

AMPLITUDE (dBm)

-40

-50

-60
1 100

FREQUENCY (MHz)

MCLK = 13MHz,
LRCLK = 44.1kHz
PLL MODE
Z

SPK

10

MAX9888 toc69

MAX9888 toc72

= 8I + 68µH

41

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

REF

DACATTN

REC

SPKLVDD

= 2.2FF, C

= 0dB, AV

= 0dB, AV

MICBIAS

SPK_

Line to Speaker

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (LINE TO SPEAKER)

0

Z

= 8I + 68µH

SPK

-10

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

AV

f = 1000Hz

0

SPK_

= +8dB

f = 6000Hz

f = 100Hz

OUTPUT POWER (W)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (LINE TO SPEAKER)

0

V

= 200mV

RIPPLE

INPUT AC GROUNDED

-20

-40

PSRR (dB)

-60

-80

-100

RIPPLE ON AVDD,

MAX9888 toc73

0.80.60.2 0.4

RMS

DVDD, HPVDD

RIPPLE ON SPKLVDD,

SPKRVDD

10,000100010010 100,000

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (LINE TO SPEAKER)

0

Z

= 8I + 68µH

SPK

-10

= 1µF

C

IN

AV

= +8dB

SPK_

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90
10 100,000

MAX9888 toc76

P

= 0.55W

OUT

P

= 0.25W

OUT

FREQUENCY (Hz)

10,0001000100

-10

-20

-30

-40

-50

CROSSTALK (dB)

-60

-70

-80

-90

GAIN vs. FREQUENCY

(LINE TO SPEAKER)

5

Z

= 8I + 68µH

SPK

4

= 1µF

C

MAX9888 toc74

NORMALIZED GAIN (dB)

IN

3

2

1

0

-1

-2

-3

-4

-5

FREQUENCY (Hz)

CROSSTALK vs. FREQUENCY

(LINE TO SPEAKER)

0

Z

= 8I + 68µH

SPK

10 100,000

FREQUENCY (Hz)

10,0001000100

MAX9888 toc75

10,000100010010 100,000

MAX9888 toc77

42

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

SPK_

DAC to Headphone

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

MAX9888

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO HEADPHONE)

0

MCLK = 13MHz

-10

LRCLK = 8kHz
FREQ MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

R

HP

AV

HP_

f = 1000Hz

= 32I

= +3dB

f = 3000Hz

f = 100Hz

0.040.030.020.010 0.05

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-10

LRCLK = 96kHz
NI MODE

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

= 32I

R

HP

AV

HP_

f = 1000Hz

= +3dB

f = 6000Hz

f = 100Hz

0.040.030.020.010 0.05

OUTPUT POWER (W)

MAX9888 toc78

THD+N RATIO (dB)

MAX9888 toc81

THD+N RATIO (dB)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO HEADPHONE)

0

MCLK = 13MHz

-10

LRCLK = 44.1kHz
PLL MODE

-20

-30

-40

-50

-60

-70

-80

-90

= 32I

R

HP

AV

HP_

f = 1000Hz

= +3dB

f = 6000Hz

f = 100Hz

0.040.030.020.010 0.05

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-10

LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

-60

-70

-80

-90

= 16I

R

HP

AV

= +3dB

HP_

f = 1000Hz

f = 6000Hz

f = 100Hz

0.070.060.04 0.050.02 0.030.010 0.08

OUTPUT POWER (W)

MAX9888 toc79

THD+N RATIO (dB)

MAX9888 toc82

THD+N RATIO (dB)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-10

LRCLK = 48kHz
NI MODE

-20

-30

-40

-50

-60

-70

-80

-90

= 32I

R

HP

AV

HP_

f = 1000Hz

= +3dB

f = 6000Hz

f = 100Hz

0.040.030.020.010 0.05

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (LINE TO SPEAKER)

0

MCLK = 13MHz

-10

LRCLK = 8kHz
FREQ MODE

-20

RHP = 32I
AV

-30

-40

-50

-60

-70

-80

-90

= +3dB

HP_

P

= 0.01W

OUT

P

= 0.02W

OUT

10 10,000

FREQUENCY (Hz)

1000100

MAX9888 toc80

MAX9888 toc83

43

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO HEADPHONE)

0

MCLK = 13MHz

-10

LRCLK = 44.1kHz
PLL MODE

-20

= 32I

R

HP

-30

AV

= +3dB

HP_

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90

P

= 0.025W

OUT

P

= 0.1W

OUT

10 100,000

FREQUENCY (Hz)

10,0001000100

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-10

LRCLK = 48kHz
NI MODE

-20

RHP = 16I

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

-90
10 100,000

P

= 0.01W

OUT

P

= 0.0.25W

OUT

FREQUENCY (Hz)

10,0001000100

TOTAL HARMONIC DISTORTION PLUS NOISE

0

-10

MAX9888 toc84

-20

-30

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100

10

MAX9888 toc87

0

-10

-20

-30

-40

NORMALIZED GAIN (dB)

-50

-60

-70

vs. FREQUENCY (DAC TO HEADPHONE)

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE
RHP = 32I
AV

= +3dB

HP_

P

= 0.025W

OUT

P

= 0.01W

OUT

10 100,000

FREQUENCY (Hz)

10,0001000100

GAIN vs. FREQUENCY
(DAC TO HEADPHONE)

MODE = 1

MODE = 0

MCLK = 13MHz
LRCLK = 8kHz
NI MODE
R

= 32I

HP

10,000100010010 100,000

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-10

MAX9888 toc85

LRCLK = 96kHz

-20

NI MODE
RHP = 32I

-30

AV

-40

-50

-60

THD+N RATIO (dB)

-70

-80

-90

-100
10 100,000

HPVDD INPUT CURRENT vs. OUTPUT

120

100

MAX9888 toc88

80

60

40

HPVDD INPUT CURRENT (mA)

20

0

0.01 100

= +3dB

HP_

P

= 0.025W

OUT

P

= 0.01W

OUT

10,0001000100

FREQUENCY (Hz)

POWER (DAC TO HEADPHONE)

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

RHP = 16I

OUTPUT POWER PER CHANNEL (mW)

MAX9888 toc86

MAX9888 toc89

RHP = 32I

1010.1

44

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

-20

-40

PSRR (dB)

-60

-80

-100

SCL

2V/div

HEADPHONE

OUTPUT

0.5V/div

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (DAC TO HEADPHONE)

0

V

= 200mV

RIPPLE

INPUT ALL ZEROS

P-P

RIPPLE ON SPKLVDD,

SPKRVDD

RIPPLE ON AVDD,

DVDD, HPVDD

10,000100010010 100,000

FREQUENCY (Hz)

SOFTWARE TURN-ON/ OFF RESPONSE

(DAC TO HEADPHONE, VSEN = 1)

10ms/div

MAX9888 toc93

MAX9888 toc90

CROSSTALK vs. FREQUENCY

(DAC TO HEADPHONE)

-40

MCLK = 12.288MHz
LRCLK = 48kHz

-50

NI MODE

= 32I

R

HP

-60

-70

CROSSTALK (dB)

-80

-90

-100

FREQUENCY (Hz)

FFT, 0dBFS (DAC TO HEADPHONE)

0

MCLK = 13MHz,

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140

LRCLK = 8kHz
FREQ MODE

= 32I

R

HP

0 20,000

FREQUENCY (Hz)

10,000100010010 100,000

15,00010,0005000

MAX9888 toc91

HEADPHONE

MAX9888 toc94

SOFTWARE TURN-ON/ OFF RESPONSE

(DAC TO HEADPHONE, VSEN = 0)

SCL

2V/div

OUTPUT

0.5V/div

10ms/div

FFT, -60dBFS (DAC TO HEADPHONE)

0

MCLK = 13MHz,

-20

LRCLK = 8kHz
FREQ MODE

-40

-60

-80

-100

AMPLITUDE (dBV)

-120

-140

-160

= 32I

R

HP

0 20,000

FREQUENCY (Hz)

MAX9888 toc92

MAX9888 toc95

15,00010,0005000

45

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

HPVSS

= 0dB,

FFT, 0dBFS (DAC TO HEADPHONE)

0

MCLK = 13MHz,
LRCLK = 44.1kHz

-20

PLL MODE

= 32I

R

-40

-60

-80

AMPLITUDE (dBV)

-100

-120

-140

HP

0 20,000

FREQUENCY (Hz)

15,00010,0005000

0

-20

-40

-60

-80

AMPLITUDE (dBV)

-100

FFT, -60dBFS (DAC TO HEADPHONE)

0

MAX9888 toc96

-20

-40

-60

-80

-100

AMPLITUDE (dBV)

-120

-140

-160
0 20,000

FFT, 0dBFS (DAC TO HEADPHONE)

MCLK = 12.288MHz
LRCLK = 48kHz
NI MODE

= 32I

R

HP

MCLK = 13MHz,
LRCLK = 44.1kHz
PLL MODE

= 32I

R

HP

FREQUENCY (Hz)

MAX9888 toc98

MAX9888 toc97

15,00010,0005000

46

-120

-140
0 20,000

FREQUENCY (Hz)

15,00010,0005000

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

FFT, -60dBFS (DAC TO HEADPHONE)

0

MCLK = 12.288MHz

-20

LRCLK = 48kHz
NI MODE

-40

-60

-80

-100

AMPLITUDE (dBV)

-120

-140

-160

= 32I

R

HP

0 20,000

FREQUENCY (Hz)

WIDEBAND FFT, 0dBFS

(DAC TO HEADPHONE)

20

0

-20

-40

AMPLITUDE (dBm)

-60

FFT, 0dBFS (DAC TO HEADPHONE)

0

MCLK = 12.288MHz
LRCLK = 96kHz

-20

MAX9888 toc99

AMPLITUDE (dbV)

-100

-120

-140

15,00010,0005000

NI MODE

= 32I

R

-40

-60

-80

HP

0 20,000

FREQUENCY (Hz)

15,00010,0005000

MAX9888 toc100

FFT, -60dBFS (DAC TO HEADPHONE)

0

MCLK = 2.288MHz

-20

LRCLK = 96kHz
NI MODE

-40

-60

-80

-100

AMPLITUDE (dBV)

-120

-140

-160

= 32I

R

HP

0 20,000

FREQUENCY (Hz)

MAX9888 toc101

15,00010,0005000

WIDEBAND FFT, -60dBFS

(DAC TO HEADPHONE)

20

MCLK = 13MHz
LRCLK = 44.1kHz
PLL MODE

= -3dB

A

VHP_

R

= 32I

HP

MAX9888 toc102

MCLK = 13MHz
LRCLK = 44.1kHz

0

PLL MODE
A

VHP_

-20

R

= 32I

HP

-40

AMPLITUDE (dBm)

-60

= -3dB

MAX9888 toc103

-80

-100
0 10,000

FREQUENCY (kHz)

-80

-100

1000100101

0 10,000

FREQUENCY (kHz)

1000100101

47

Stereo Audio CODEC
with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

MAX9888

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

= 2.2FF, C

REF

= 0dB, AV

REC

= 0dB, AV

DACATTN

SPKLVDD

= V

MICBIAS

DACGAIN

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

SPK_

Line to Headphone

SPKRVDD

= C

PREG

= 0dB, AV

= 3.7V. Speaker loads (Z

= C

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (LINE TO HEADPHONE)

0

RHP = 32I

-10

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

-80

= +3dB

A

VHP_

f = 6000Hz

f = 1000Hz

f = 100Hz

0 0.05

OUTPUT POWER (W)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY (LINE TO HEADPHONE)

0

V

= 200mV

-20

-40

PSRR (dB)

-60

-80

-100

RIPPLE

P-P

RIPPLE ON AVDD,

DVDD, HPVDD

RIPPLE ON SPKLVDD,

SPKRVDD

10,000100010010 100,000

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY (LINE TO HEADPHONE)

0

RHP = 32I

-10

= 1µF

C

MAX9888 toc104

THD+N RATIO (dB)

0.040.030.01 0.02

IN

-20

-30

-40

-50

P

-60

-70

-80

-90
10 100,000

= 0.01W

OUT

P

= 0.025W

OUT

FREQUENCY (Hz)

10,0001000100

5

4

MAX9888 toc105

3

2

1

0

-1

-2

NORMALIZED GAIN (dB)

-3

-4

-5

CROSSTALK vs. FREQUENCY

(LINE TO HEADPHONE)

MAX9888 toc107

0

RHP = 32I

-10

-20

-30

-40

-50

CROSSTALK (dB)

-60

-70

-80

-90
10 100,000

FREQUENCY (Hz)

10,0001000100

MAX9888 toc108

70

60

50

40

30

CMRR (dB)

20

10

0

GAIN vs. FREQUENCY

(LINE TO HEADPHONE)

RHP = 32I

= 1µF

C

IN

10,000100010010 100,000

FREQUENCY (Hz)

COMMON-MODE REJECTION RATIO

vs. FREQUENCY (LINE TO HEADPHONE)

V

= -6dBV

OUT

= 1µF

C

IN

R

= 32I

HP

AV

= 0dB

PGAIN_

AV

= 20dB

PGAIN_

10,000100010010 100,000

FREQUENCY (Hz)

MAX9888 toc106

MAX9888 toc109

48

Stereo Audio CODEC

with FlexSound Technology

Typical Operating Characteristics (continued)

(V

= V

AVDD

between SPK_P and SPK_N. Receiver load (R
HPL or HPR to GND. R
= 1FF. AV
AV

1. T

MICPRE_

= 0dB, AV

PGAIN_

= +25NC, unless otherwise noted.)

A

HPVDD

= V

DVDD

= J, R

HP

= V

= +20dB, AV

PGAOUT_

= 0dB, AV

DVDDS1

= J, Z

REC

MICPGA_

= V

SPK

= 0dB, AV

= 0dB, AV

HP_

= +1.8V, V

DVDDS2

) connected between RECP and RECN. Headphone loads (RHP) connected from

REC

= J, C

= 2.2FF, C

REF

DACATTN

= 0dB, AV

REC

= 0dB, AV

Speaker Bypass Switch

SPKLVDD

MICBIAS

SPK_

= V

SPKRVDD

= C

DACGAIN

= 3.7V. Speaker loads (Z

= C

PREG

= 0dB, AV

REG

ADCLVL

= 1FF, C

= 0dB, AV

C1N-C1P

) connected

SPK

= 1FF, C

ADCGAIN

HPVSS

= 0dB,

= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS =

MAX9888

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

(SPEAKER BYPASS SWITCH)

0

RECEIVER AMPLIFIER DRIVING

-10

LOUDSPEAKER
Z

= 8I + 68µH

SPK

-20

-30

-40

-50

THD+N RATIO (dB)

-60

-70

f = 100Hz

-80
0

f = 1000Hz

OUTPUT POWER (W)

MAX9888 toc110

f = 6000Hz

0.15 0.200.100.05

OFF-ISOLATION vs. FREQUENCY

(SPEAKER BYPASS SWITCH)

0

SPEAKER AMP DRIVING LOUDSPEAKER
SPEAKER BYPASS SWITCH OPEN

-20

MEASURED AT RXIN_

-40

-60

50I LOAD ON RXIN_

ON RESISTANCE vs. V

(SPEAKER BYPASS SWITCH)

4.0
ISW = 20mA

3.5

3.0

2.5

(I)

2.0

V

= 3.0V

SPK_VDD

ON

R

1.5

1.0

0.5

0

V

= 3.7V

SPK_VDD

V

= 4.2V

SPK_VDD

V

SPK_VDD

0 6

V

(V)

COM

MAX9888 toc112

COM

MAX9888 toc111

= 5.0V

541 2 3

-80

OFF-ISOLATION (dB)

-100

-120

RECEIVER AMP DRIVING RXIN_

10 100,000

FREQUENCY (Hz)

10,0001000100

49

Stereo Audio CODEC
with FlexSound Technology

Pin Configuration

TOP VIEW
(BUMP SIDE DOWN)

1 2 3 4 5 6 7 8 9

MAX9888

A

B

C

D

E

F

SPKRN

SPKRN

SPKRP

BCLKS1 LRCLKS1

DVDDS1 SDOUTS1

DGND

SPKRGND

MCLK IRQ

BCLKS2 LRCLKS2

SPKLVDD SPKLP

SPKLVDD SPKLPSPKRGND SPKLN

SPKRVDD

SPKRVDD SDINS1

N.C.

SPKLN

SPKLGNDSPKRP SPKLGND HPSNS

MAX9888

N.C. INB1

SCLSDA REG

RECP/
RXINP

RECN/
RXINN

JACKSNS

HPVDD HPGND

C1P C1N

N.C. INB2

N.C.

N.C.N.C.

REF

MIC1P/

DIGMICDATA

MIC1N/

DIGMICCLK

HPVSS

HPL

HPR

INA2/

EXTMICN

INA1/

EXTMICP

MIC2P

50

SDOUTS2 DVDDS2 SDINS2 MIC2N

G

AVDDDVDD PREG

AGND MICBIAS

Stereo Audio CODEC

with FlexSound Technology

Pin Description

PIN NAME FUNCTION

A1, B1 SPKRN Negative Right-Channel Class D Speaker Output
A2, B2 SPKRGND Right-Speaker Ground

A3, B3 SPKLVDD

A4, B4 SPKLP Positive Left-Channel Class D Speaker Output
A5, B5 SPKLN Negative Left-Channel Class D Speaker Output

A6 RECP/RXINP

A7 HPVDD Headphone Power Supply. Bypass to HPGND with a 1FF capacitor.
A8 HPGND Headphone Ground
A9 HPVSS Inverting Charge-Pump Output. Bypass to HPGND with a 1FF ceramic capacitor.

B6 RECN/RXINN

B7 C1P

B8 C1N

B9 HPL Left-Channel Headphone Output
C1, C2 SPKRP Positive Right-Channel Class D Speaker Output
C3, D3 SPKRVDD Right-Speaker Power Supply. Bypass to SPKRGND with a 1FF capacitor.
C4, C5 SPKLGND Left-Speaker Ground

C6 HPSNS

C7, D5, D7,

E3, E6, E7

C8 INB2 Single-Ended Line Input B2. Also positive differential line input B.
C9 HPR Right-Channel Headphone Output

D1 BCLKS1

D2 LRCLKS1

D4 SDINS1 S1 Digital Audio Serial-Data DAC Input. The input voltage is referenced to DVDDS1.
D6 JACKSNS Jack Sense. Detects the insertion of a jack. See the Headset Detection section.
D8 INB1 Single-Ended Line Input B1. Also negative differential line input B.

D9

N.C. No Connection

INA2/

EXTMICN

Left-Speaker, REF, Receiver Amplifier Power Supply. Bypass to SPKLGND with a 1FF and a 10FF
capacitor.

Positive Receiver Amplifier Output. Can be positive bypass switch input when receiver amp is shut
down.

Negative Receiver Amplifier Output. Can be negative bypass switch input when receiver amp is shut
down.

Charge-Pump Flying Capacitor Positive Terminal. Connect a 1FF ceramic capacitor between C1N
and C1P.

Charge-Pump Flying Capacitor Negative Terminal. Connect a 1FF ceramic capacitor between C1N
and C1P.

Headphone Amplifier Ground Sense. Connect to the headphone jack ground terminal or connect to
ground.

S1 Digital Audio Bit Clock Input/Output. BCLKS1 is an input when the MAX9888 is in slave mode and
an output when in master mode. The input/output voltage is referenced to DVDDS1.

S1 Digital Audio Left-Right Clock Input/Output. LRCLKS1 is the audio sample rate clock and
determines whether S1 audio data is routed to the left or right channel. In TDM mode, LRCLKS1 is a
frame sync pulse. LRCLKS1 is an input when the MAX9888 is in slave mode and an output when in
master mode. The input/output voltage is referenced to DVDDS1.

Single-Ended Line Input A2. Also positive differential line input A or negative differential external
microphone input.

MAX9888

51

Stereo Audio CODEC
with FlexSound Technology

Pin Description (continued)

PIN NAME FUNCTION

E1 DVDDS1 S1 Digital Audio Interface Power-Supply Input. Bypass to DGND with a 1FF capacitor.
E2 MCLK Master Clock Input. Acceptable input frequency range is 10MHz to 60MHz.
E4 SDOUTS1 S1 Digital Audio Serial-Data ADC Output. The output voltage is referenced to DVDDS1.

Hardware Interrupt Output. IRQ can be programmed to pull low when bits in status register 0x00

MAX9888

E5 IRQ

E8

E9

F1 DGND Digital Ground

F2 BCLKS2

F3 LRCLKS2

F4 SDA I

F5 SCL I

F6 REG Common-Mode Voltage Reference. Bypass to AGND with a 1FF capacitor.

F7 REF Converter Reference. Bypass to AGND with a 2.2FF capacitor.

F8

F9 MIC2P Positive Differential Microphone 2 Input. AC-couple a microphone with a series 1FF capacitor.

G1 SDOUTS2 S2 Digital Audio Serial-Data ADC Output. The output voltage is referenced to DVDDS2.
G2 DVDDS2 S2 Digital Audio Interface Power-Supply Input. Bypass to DGND with a 1FF capacitor.
G3 SDINS2 S2 Digital Audio Serial-Data DAC Input. The input voltage is referenced to DVDDS2.

G4 DVDD

G5 AVDD Analog Power Supply. Bypass to AGND with a 1FF capacitor.
G6 PREG Positive Internal Regulated Supply. Bypass to AGND with a 1FF capacitor.
G7 AGND Analog Ground

G8 MICBIAS

G9 MIC2N Negative Differential Microphone 2 Input. AC-couple a microphone with a series 1FF capacitor.

MIC1P/

DIGMICDATA

INA1/

EXTMICP

MIC1N/

DIGMICCLK

change state. Read status register 0x00 to clear IRQ once set. Repeat faults have no effect on IRQ
until it is cleared by reading the I
full output swing.

Positive Differential Microphone 1 Input. AC-couple a microphone with a series 1FF capacitor. Can
be retasked as a digital microphone data input.

Single-Ended Line Input A1. Also negative differential line input A or positive differential external
microphone input.

S2 Digital Audio Bit Clock Input/Output. BCLKS2 is an input when the IC is in slave mode and an
output when in master mode. The input/output voltage is referenced to DVDDS2.

S2 Digital Audio Left-Right Clock Input/Output. LRCLKS2 is the audio sample rate clock and
determines whether audio data on S2 is routed to the left or right channel. In TDM mode, LRCLKS2 is
a frame sync pulse. LRCLKS2 is an input when the IC is in slave mode and an output when in master
mode. The input/output voltage is referenced to DVDDS2.

2

C Serial-Data Input/Output. Connect a pullup resistor to DVDD for full output swing.

2

C Serial-Clock Input

Negative Differential Microphone 1 Input. AC-couple a microphone with a series 1FF capacitor. Can
be retasked as a digital microphone clock output.

Digital Power Supply. Supply for the digital core and I
capacitor.

Low-Noise Bias Voltage. Outputs a 2.2V microphone bias. An external resistor in the 2.2kI to 1kI
range should be used to set the microphone current.

2

C status register 0x00. Connect a 10kI pullup resistor to DVDD for

2

C interface. Bypass to DGND with a 1FF

52

with FlexSound Technology

Detailed Description

The MAX9888 is a fully integrated stereo audio codec
with FlexSound technology and integrated amplifiers.

Two differential microphone amplifiers can accept sig­nals from three analog inputs. One input can be retasked
to support two digital microphones. Any combination of
two microphones (analog or digital) can be recorded
simultaneously. The analog signals are amplified up
to 50dB and recorded by the stereo ADC. The digital
record path supports voice filtering with selectable
preset highpass filters and high stopband attenuation

/2. An automatic gain control (AGC) circuit moni-

at f

S

tors the digitized signal and automatically adjusts the
analog microphone gain to make best use of the ADC’s
dynamic range. A noise gate attenuates signals below
the user-defined threshold to minimize the noise output
by the ADC.

The IC includes two analog line inputs. One of the line
inputs can be optionally retasked as a third analog micro­phone input. Both line inputs support either stereo single­ended input signals or mono differential signals. The line
inputs are preamplified and then routed either to the ADC
for recording or to the output amplifiers for playback.

Integrated analog switches allow two differential micro­phone signals to be routed out the third microphone
input to an external device. This eliminates the need
for an external analog switch in systems that have two
devices recording signals from the same microphone.

Through two digital audio interfaces, the device can
transmit one stereo audio signal and receive two stereo
audio signals in a wide range of formats including I
PCM, and up to four mono slots in TDM. Each interface
can be connected to either of two audio ports (S1 and
S2) for communication with external devices. Both audio
interfaces support 8kHz to 96kHz sample rates. Each
input signal is independently equalized using 5-band
parametric equalizers. A multiband automatic level
control (ALC) boosts signals by up to 12dB. One signal
path additionally supports the same voiceband filtering
as the ADC path.

The IC includes a differential receiver amplifier, stereo
Class D speaker amplifiers, and DirectDrive true ground
stereo headphone amplifiers.

2

S,

Stereo Audio CODEC

When the receiver amplifier is disabled, analog switches
allow RECP/RXINP and RECN/RXINN to be reused for
signal routing. In systems where a single transducer is
used for both the loudspeaker and receiver, an exter­nal receiver amplifier can be routed to the left speaker
through RECP/RXINP and RECN/RXINN, bypassing the
Class D amplifier, to connect to the loudspeaker. If the
internal receiver amplifier is used, then leave RECP/
RXINP and RECN/RXINN unconnected. In systems
where an external amplifier drives both the receiver and
the MAX9888’s input, one of the differential signals can
be disconnected from the receiver when not needed
by passing it through the analog switch that connects
RECP/RXINP to RECN/RXINN.

The stereo Class D amplifier provides efficient amplifi­cation for two speakers. The amplifier includes active
emissions limiting to minimize the radiated emissions
(EMI) traditionally associated with Class D. In most
systems, no output filtering is required to meet standard
EMI limits.

To optimize speaker sound quality, the IC includes an
excursion limiter, a distortion limiter, and a power limiter.
The excursion limiter is a dynamic highpass filter with
variable corner frequency that increases in response
to high signal levels. Low-frequency energy typically
causes more distortion than useful sound at high sig­nal levels, so attenuating low frequencies allows the
speaker to play louder without distortion or damage. At
lower signal levels, the filter corner frequency reduces
to pass more low frequency energy when the speaker
can handle it. The distortion limiter reduces the volume
when the output signal exceeds a preset distortion level.
This ensures that regardless of input signal and battery
voltage, excessive distortion is never heard by the user.
The power limiter monitors the continuous power into the
loudspeaker and lowers the signal level if the speaker is
at risk of overheating.

The stereo DirectDrive headphone amplifier uses an
inverting charge pump to generate a ground-referenced
output signal. This eliminates the need for DC-blocking
capacitors or a midrail bias for the headphone jack
ground return. Ground sense reduces output noise
caused by ground return current.

The IC integrates jack detection allowing the detection
of insertion and removal of accessories as well as button
presses.

MAX9888

53

Stereo Audio CODEC
with FlexSound Technology

I2C Slave Address

Configure the MAX9888 using the I2C control bus. The
IC uses a slave address of 0x20 or 00100000 for write
operations and 0x21 or 00100001 for read operations.

2

See the I

C Serial Interface section for a complete inter-

face description.

Table 1 lists all of the registers, their addresses, and
power-on-reset states. Registers 0x00 to 0x03 and 0xFF
are read-only while all of the other registers are read/
write. Write zeros to all unused bits in the register table
when updating the register, unless otherwise noted.

MAX9888

Table 1. Register Map

REGISTER B7 B6 B5 B4 B3 B2 B1 B0 ADDRESS DEFAULT R/W PAGE

STATUS

Status CLD SLD ULK — — — JDET — 0x00 — R

Microphone
AGC/NG

Jack Status JKSNS — — — — — — 0x02 — R

Battery
Voltage

Interrupt
Enable

MASTER CLOCK CONTROL

Master Clock 0 0 PSCLK 0 0 0 0 0x10 0x00 R/W

DAI1 CLOCK CONTROL

Clock Mode SR1 FREQ1 0x11 0x00 R/W

Any Clock
Control

DAI1 CONFIGURATION

Format MAS1 WCI1 BCI1 DLY1 0 TDM1 FSW1 WS1 0x14 0x00 R/W
Clock OSR1 0 0 0 BSEL1 0x15 0x00 R/W

I/O
Configuration

Time-Division
Multiplex

Filters MODE1 AVFLT1 DHF1 DVFLT1 0x18 0x00 R/W

DAI2 CLOCK CONTROL

Clock Mode SR2 0 0 0 0 0x19 0x00 R/W

Any Clock
Control

DAI2 CONFIGURATION

— — — VBAT 0x03 — R/W

ICLD ISLD IULK 0 0 0 IJDET 0 0x0F 0x00 R/W

PLL1 NI1[14:8] 0x12 0x00 R/W

PLL2 NI2[14:8] 0x1A 0x00 R/W

NG AGC 0x01 — R

NI1[7:1] NI1[0] 0x13 0x00 R/W

SEL1 LTEN1 LBEN1 DMONO1 HIZOFF1 SDOEN1 SDIEN1 0x16 0x00 R/W

SLOTL1 SLOTR1 SLOTDLY1 0x17 0x00 R/W

NI2[7:1] NI2[0] 0x1B 0x00 R/W

Registers

103

65

101

102

103

76

76
77
77

71
72

72

73

79

76
77
77

Format MAS2 WCI2 BCI2 DLY2 0 TDM2 FSW2 WS2 0x1C 0x00 R/W

Clock 0 0 0 0 0 BSEL2 0x1D 0x00 R/W

I/O
Configuration

54

SEL2 0 LBEN2 DMONO2 HIZOFF2 SDOEN2 SDIEN2 0x1E 0x00 R/W

71

72

72

Stereo Audio CODEC

with FlexSound Technology

Table 1. Register Map (continued)

REGISTER B7 B6 B5 B4 B3 B2 B1 B0 ADDRESS DEFAULT R/W PAGE

Time-Division
Multiplex

Filters 0 0 0 0 DHF2 0 0 DCB2 0x20 0x00 R/W

MIXERS

DAC Mixer MIXDAL MIXDAR 0x21 0x00 R/W

Left ADC
Mixer

Right ADC
Mixer

Preoutput 1
Mixer

Preoutput 2
Mixer

Preoutput 3
Mixer

Headphone
Amplifier
Mixer

Receiver
Amplifier
Mixer

Speaker
Amplifier
Mixer

LEVEL CONTROL

Sidetone DSTS 0 DVST 0x2A 0x00 R/W

DAI1
Playback
Level

DAI1
Playback
Level

DAI2
Playback
Level

DAI2
Playback
Level

Left ADC
Level

Right ADC
Level

Microphone
1 Input Level

SLOTL2 SLOTR2 SLOTDLY2 0x1F 0x00 R/W

MIXADL 0x22 0x00 R/W

MIXADR 0x23 0x00 R/W

0 0 0 0 MIXOUT1 0x24 0x00 R/W

0 0 0 0 MIXOUT2 0x25 0x00 R/W

0 0 0 0 MIXOUT3 0x26 0x00 R/W

MIXHPL MIXHPR 0x27 0x00 R/W

0 0 0 0 MIXREC 0x28 0x00 R/W

MIXSPL MIXSPR 0x29 0x00 R/W

DV1M 0 DV1G DV1 0x2B 0x00 R/W

0 0 0

DV2M 0 0 0 DV2 0x2D 0x00 R/W

0 0 0

0 0 AVLG AVL 0x2F 0x00 R/W

0 0 AVRG AVR 0x30 0x00 R/W

0 PA1EN PGAM1 0x31 0x00 R/W

EQCLP1

EQCLP2

DVEQ1 0x2C 0x00 R/W

DVEQ2 0x2E 0x00 R/W

MAX9888

73

79

85

64

64

86

86

86

97

88

90

69

84

83

84

83

68

68

61

55

Stereo Audio CODEC
with FlexSound Technology

Table 1. Register Map (continued)

REGISTER B7 B6 B5 B4 B3 B2 B1 B0 ADDRESS DEFAULT R/W PAGE

Microphone
2 Input Level

INA Input
Level

INB Input

MAX9888

Level

Preoutput 1
Level

Preoutput 2
Level

Preoutput 3
Level

Left
Headphone
Amplifier
Volume
Control

Right
Headphone
Amplifier
Volume
Control

Receiver
Amplifier
Volume
Control

Left Speaker
Amplifier
Volume
Control

Right
Speaker
Amplifier
Volume
Control

MICROPHONE AGC

Configuration AGCSRC AGCRLS AGCATK AGCHLD 0x3D 0x00 R/W
Threshold ANTH AGCTH 0x3E 0x00 R/W

SPEAKER SIGNAL PROCESSING

Excursion
Limiter Filter

Excursion
Limiter
Threshold

ALC ALCEN ALCRLS ALCMB ALCTH 0x41 0x00 R/W

0 PA2EN PGAM2 0x32 0x00 R/W

0 INAEXT 0 0 0 PGAINA 0x33 0x00 R/W

0 INBEXT 0 0 0 PGAINB 0x34 0x00 R/W

0 0 0 0 PGAOUT1 0x35 0x00 R/W

0 0 0 0 PGAOUT2 0x36 0x00 R/W

0 0 0 0 PGAOUT3 0x37 0x00 R/W

HPLM 0 0 HPVOLL 0x38 0x00 R/W

HPRM 0 0 HPVOLR 0x39 0x00 R/W

RECM 0 0 RECVOL 0x3A 0x00 R/W

SPLM 0 0 SPVOLL 0x3B 0x00 R/W

SPRM 0 0 SPVOLR 0x3C 0x00 R/W

0 DHPUCF 0 0 DHPLCF 0x3F 0x00 R/W

0 0 0 0 0 DHPTH 0x40 0x00 R/W

61

63

63

87

87

87

97

97

88

90

90

65
66

92

92

82

56

Stereo Audio CODEC

with FlexSound Technology

Table 1. Register Map (continued)

REGISTER B7 B6 B5 B4 B3 B2 B1 B0 ADDRESS DEFAULT R/W PAGE

Power Limiter PWRTH 0 PWRK 0x42 0x00 R/W
Power Limiter PWRT2 PWRT1 0x43 0x00 R/W

Distortion
Limiter

CONFIGURATION

Audio Input INADIFF INBDIFF 0 0 0 0 0 0 0x45 0x00 R/W
Microphone MICCLK DIGMICL DIGMICR 0 0 EXTMIC 0x46 0x00 R/W
Level Control

Bypass
Switches

Jack
Detection

POWER MANAGEMENT

Input Enable INAEN INBEN 0 0 MBEN 0 ADLEN ADREN 0x4A 0x00 R/W
Output Enable HPLEN HPREN SPLEN SPREN RECEN 0 DALEN DAREN 0x4B 0x00 R/W

System
Enable

DSP COEFFICIENTS

EQ Band 1
(DAI1/DAI2)

EQ Band 2
(DAI1/DAI2)

VS2EN VSEN ZDEN

INABYP 0 0 MIC2BYP 0 0 RECBYP SPKBYP 0x48 0x00 R/W

JDETEN 0 0 0 0 0 JDEB 0x49 0x00 R/W

SHDN

THDCLP 0 THDT1 0x44 0x00 R/W

0 0 0 EQ2EN EQ1EN 0x47 0x00 R/W

VBATEN 0 0 0 0 JDWK 0 0x4C 0x00 R/W

K_1[15:8] 0x50/0x82 0xXX R/W

K_1[7:0] 0x51/0x83 0xXX R/W

K1_1[15:8] 0x52/0x84 0xXX R/W

K1_1[7:0] 0x53/0x85 0xXX R/W

K2_1[15:8] 0x54/0x86 0xXX R/W

K2_1[7:0] 0x55/0x87 0xXX R/W

c1_1[15:8] 0x56/0x88 0xXX R/W

c1_1[7:0] 0x57/0x89 0xXX R/W

c2_1[15:8] 0x58/0x8A 0xXX R/W

c2_1[7:0] 0x59/0x8B 0xXX R/W

K_2[15:8] 0x5A/0x8C 0xXX R/W

K_2[7:0] 0x5B/0x8D 0xXX R/W

K1_2[15:8] 0x5C/0x8E 0xXX R/W

K1_2[7:0] 0x5D/0x8F 0xXX R/W

K2_2[15:8] 0x5E/0x90 0xXX R/W

K2_2[7:0] 0x5F/0x91 0xXX R/W

c1_2[15:8] 0x60/0x92 0xXX R/W

c1_2[7:0] 0x61/0x93 0xXX R/W

c2_2[15:8] 0x62/0x94 0xXX R/W

c2_2[7:0] 0x63/0x95 0xXX R/W

99, 83

62, 98

MAX9888

93
94

95

63
61

101

59
59

59

82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82

57

Stereo Audio CODEC
with FlexSound Technology

Table 1. Register Map (continued)

REGISTER B7 B6 B5 B4 B3 B2 B1 B0 ADDRESS DEFAULT R/W PAGE

K_3[15:8] 0x64/0x96 0xXX R/W

K_3[7:0] 0x65/0x97 0xXX R/W

K1_3[15:8] 0x66/0x98 0xXX R/W

K1_3[7:0] 0x67/0x99 0xXX R/W

EQ Band 3

MAX9888

(DAI1/DAI2)

EQ Band 4
(DAI1/DAI2)

EQ Band 5
(DAI1/DAI2)

Excursion
Limiter
Biquad
(DAI1/DAI2)

REVISION ID

Rev ID REV 0xFF 0x43 R

K2_3[15:8] 0x68/0x9A 0xXX R/W

K2_3[7:0] 0x69/0x9B 0xXX R/W

c1_3[15:8] 0x6A/0x9C 0xXX R/W

c1_3[7:0] 0x6B/0x9D 0xXX R/W

c2_3[15:8] 0x6C/0x9E 0xXX R/W

c2_3[7:0] 0x6D/0x9F 0xXX R/W

K_4[15:8] 0x6E/0xA0 0xXX R/W

K_4[7:0] 0x6F/0xA1 0xXX R/W

K1_4[15:8] 0x70/0xA2 0xXX R/W

K1_4[7:0] 0x71/0xA3 0xXX R/W

K2_4[15:8] 0x72/0xA4 0xXX R/W

K2_4[7:0] 0x73/0xA5 0xXX R/W

c1_4[15:8] 0x74/0xA6 0xXX R/W

c1_4[7:0] 0x75/0xA7 0xXX R/W

c2_4[15:8] 0x76/0xA8 0xXX R/W

c2_4[7:0] 0x77/0xA9 0xXX R/W

K_5[15:8] 0x78/0xAA 0xXX R/W

K_5[7:0] 0x79/0xAB 0xXX R/W

K1_5[15:8] 0x7A/0xAC 0xXX R/W

K1_5[7:0] 0x7B/0xAD 0xXX R/W

K2_5[15:8] 0x7C/0xAE 0xXX R/W

K2_5[7:0] 0x7D/0xAF 0xXX R/W

c1_5[15:8] 0x7E/0xB0 0xXX R/W

c1_5[7:0] 0x7F/0xB1 0xXX R/W

c2_5[15:8] 0x80/0xB2 0xXX R/W

c2_5[7:0] 0x81/0xB3 0xXX R/W

a1[15:8] 0xB4/0xBE 0xXX R/W

a1[7:0] 0xB5/0xBF 0xXX R/W

a2[15:8] 0xB6/0xC0 0xXX R/W

a2[7:0] 0xB7/0xC1 0xXX R/W

b0[15:8] 0xB8/0xC2 0xXX R/W

b0[7:0] 0xB9/0xC3 0xXX R/W

b1[15:8] 0xBA/0xC4 0xXX R/W

b1[7:0] 0xBB/0xC5 0xXX R/W

b2[15:8] 0xBC/0xC6 0xXX R/W

b2[7:0] 0xBD/0xC7 0xXX R/W

82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
91
91
91
91
91
91
91
91
91
91

104

58

Stereo Audio CODEC

with FlexSound Technology

Power Management

The IC includes comprehensive power management to allow the disabling of all unused circuits, minimizing supply
current.

Table 2. Power Management Registers

REGISTER BIT NAME DESCRIPTION

Global Shutdown

Disables everything except the headset detection circuitry, which is controlled
separately.
0 = Device shutdown
1 = Device enabled

Line Input A Enable

0 = Disabled
1 = Enabled

Line Input B Enable

0 = Disabled
1 = Enabled

Microphone Bias Enable

0 = Disabled
1 = Enabled

Left ADC Enable

0 = Disabled
1 = Enabled

Right ADC Enable

0 = Disabled
1 = Enabled

Left Headphone Enable

0 = Disabled
1 = Enabled

Right Headphone Enable

0 = Disabled
1 = Enabled

Left Speaker Enable

0 = Disabled
1 = Enabled

Right Speaker Enable

0 = Disabled
1 = Enabled

Receiver Enable

0 = Disabled
1 = Enabled

Left DAC Enable

0 = Disabled
1 = Enabled

Right DAC Enable

0 = Disabled
1 = Enabled

0x4C

0x4A

0x4B

7

6 VBATEN See the Battery Measurement section.

1 JDWK See the Headset Detection section.

7 INAEN

6 INBEN

3 MBEN

1 ADLEN

0 ADREN

7 HPLEN

6 HPREN

5 SPLEN

4 SPREN

3 RECEN

1 DALEN

0 DAREN

SHDN

MAX9888

59

Stereo Audio CODEC
with FlexSound Technology

Microphone Inputs

The device includes three differential microphone inputs
and a low-noise microphone bias for powering the micro­phones (Figure 6). One microphone input can also be con­figured as a digital microphone input accepting signals
from up to two digital microphones. Two microphones,
analog or digital, can be recorded simultaneously.

In the typical application, one microphone input is used

MAX9888

for the handset microphone and the other is used as an
accessory microphone. In systems using a background
noise microphone, INA can be retasked as another
microphone input.

In systems where the codec is not the only device
recording microphone signals, connect microphones to

MICBIAS

MIC1P/
DIGMICDATA

MIC1N/
DIGMICCLK

REG

MBEN

MCLK

PSCLK

CLOCK

CONTROL

MIC2P/MIC2N and EXTMICP/EXTMICN. MIC1P/MIC1N
then become outputs that route the microphone signals
to an external device as needed. Two devices can then
record microphone signals without needing external
analog switches.

Analog microphone signals are amplified by two stages
of gain and then routed to the ADCs. The first stage offers
selectable 0dB, 20dB, or 30dB settings. The second
stage is a programmable-gain amplifier (PGA) adjustable
from 0dB to 20dB in 1dB steps. To maximize the signal­to-noise ratio, use the gain in the first stage whenever
possible. Zero-crossing detection is included on the PGA
to minimize zipper noise while making gain changes.

PGAM1:
+20dB TO 0dB

MIC2BYP

MIC2P

MIC2N

INABYP

INA1/EXTMICP

INA2/EXTMICN

Figure 6. Microphone Input Block Diagram

60

EXTMIC PA1EN:

0/20/30dB

EXTMIC PA2EN:

0/20/30dB

PGAINA:
+20dB TO -6dB

PGAINA:
+20dB TO -6dB

PGAM1:
+20dB TO 0dB

INADIFF

MIX

MIXADL

MIX

MIXADR

ADLEN

ADCL

ADCR

ADREN

Stereo Audio CODEC

with FlexSound Technology

Table 3. Microphone Input Registers

REGISTER BIT NAME DESCRIPTION

MIC1/MIC2 Preamplifier Gain

0x31/0x32

0x46

6

PA1EN/PA2EN

5

4

3

2

PGAM1/PGAM2

1

0

7

MICCLK

6

5 DIGMICL

4 DIGMICR

1

EXTMIC

0

Course microphone gain adjustment.
00 = Preamplifier disabled
01 = 0dB
10 = 20dB
11 = 30dB

MIC1/MIC2 PGA

Fine microphone gain adjustment.

VALUE GAIN (dB) VALUE GAIN (dB)

0x00 +20 0x0B +9
0x01 +19 0x0C +8
0x02 +18 0x0D +7
0x03 +17 0x0E +6
0x04 +16 0x0F +5
0x05 +15 0x10 +4
0x06 +14 0x11 +3
0x07 +13 0x12 +2
0x08 +12 0x13 +1
0x09 +11 0x14 to 0x1F 0

0x0A +10

Digital Microphone Clock Frequency

Select a frequency that is within the digital microphone’s clock frequency range.
Set OSR1 = 1 when using a digital microphone.
00 = PCLK/8
01 = PCLK/6
10 = 64 x LRCLK
11 = Reserved

Left Digital Microphone Enable

Set PAL1EN = 00 for proper operation.
0 = Disabled
1 = Enabled

Right Digital Microphone Enable

Set PAR1EN = 00 for proper operation.
0 = Disabled
1 = Enabled

External Microphone Connection

Routes INA_/EXTMIC_ to the microphone preamplifiers. Set INAEN = 0 when using
INA_/EXTMIC_ as a microphone input.
00 = Disabled
01 = MIC1 input
10 = MIC2 input
11 = Reserved

MAX9888

61

Stereo Audio CODEC
with FlexSound Technology

Table 3. Microphone Input Registers (continued)

REGISTER BIT NAME DESCRIPTION

INA_/EXTMIC_ to MIC1_ Bypass Switch

7 INABYP

4 MIC2BYP

MAX9888

0x48

1 RECBYP

0 SPKBYP

0 = Disabled
1 = Enabled

MIC1_ to MIC2_ Bypass Switch

0 = Disabled
1 = Enabled

See the Output Bypass Switches section.

Line Inputs

The device includes two sets of line inputs (Figure 7).
Each set can be configured as a stereo single-ended
input or as a mono differential input. Each input includes
adjustable gain to match a wide range of input signal
levels. If a custom gain is needed, the external gain
mode provides a trimmed feedback resistor. Set the gain

INABYP

PGAINA:

INA1/
EXTMICP

INA2/
EXTMICN

INB1

INB2

+20dB TO -6dB

PGAINA:
+20dB TO -6dB

PGAINB:
+20dB TO -6dB

PGAINB:
+20dB TO -6dB

INADIFF

INBDIFF

MIX

MIXOUT1

MIX

MIXOUT2

MIX

MIXOUT3

by choosing the appropriate input resistor and using the
following formula:

AV

= 20 x log (20K/RIN)

PGAIN

The external gain mode also allows summing multiple
signals into a single input, by connecting multiple input
resistors as show in Figure 8, and inputting signals larger
than 1V

P-P

LEFT

INPUT 1

LEFT

INPUT 2

RIGHT

INPUT 1

RIGHT

INPUT 2

.

20kI

INA1/EXTMICP

VCM

20kI

INA2/EXTMICN

VCM

Figure 7. Line Input Block Diagram

62

Figure 8. Summing Multiple Input Signals into INA/INB

Stereo Audio CODEC

with FlexSound Technology

Table 4. Line Input Registers

REGISTER BIT NAME DESCRIPTION

Line Input A/B External Gain

Switches out the internal input resistor and selects a trimmed 20kI feedback resistor.
Use an external input resistor to set the gain of the line input.
0 = Disabled
1 = Enabled

Line Input A/B Internal Gain Settings

000 = +20dB
001 = +14dB
010 = +3dB
011 = 0dB
100 = -3dB
101 = -6dB
110 = -6dB
111 = -6dB

Line Input A Differential Enable

0 = Stereo single-ended input
1 = Mono differential input

Line Input B Differential Enable

0 = Stereo single-ended input
1 = Mono differential input

0x33/0x34

0x45

6 INAEXT/INBEXT

2

1

PGAINA/PGAINB

0

7 INADIFF

6 INBDIFF

MAX9888

ADC Input Mixers

The device’s stereo ADC accepts input from the micro­phone amplifiers and line inputs. The ADC mixer routes
any combination of the six audio inputs to the left and
right ADCs (Figure 9).

PGAM1:
+20dB TO 0dB

PA1EN:
0/20/30dB

PGAM2:
+20dB TO 0dB

PA2EN:
0/20/30dB

PGAINA:
+20dB TO -6dB

INADIFF

PGAINA:
+20dB TO -6dB

+

PGAINB:
+20dB TO -6dB

INBDIFF

PGAINB:
+20dB TO -6dB

+

Figure 9. ADC Input Mixer Block Diagram

MIX

MIXADL

MIX

MIXADR

ADLEN

ADCL

ADCR

ADREN

63

Stereo Audio CODEC
with FlexSound Technology

Table 5. ADC Input Mixer Register

REGISTER BIT NAME DESCRIPTION

7

6

5

0x22/0x23

MAX9888

4

3

2

1

0

MIXADL/MIXADR

Left/Right ADC Input Mixer

Selects which analog inputs are recorded by the left/right ADC.
1xxxxxxx = MIC1
x1xxxxxx = MIC2
xx1xxxxx = Reserved
xxx1xxxx = Reserved
xxxx1xxx = INA1
xxxxx1xx = INA2 (INADIFF = 0) or INA2 - INA1 (INADIFF = 1)
xxxxxx1x = INB1
xxxxxxx1 = INB2 (INBDIFF = 0) or INB2 - INB1 (INBDIFF = 1)

Record Path Signal Processing

The device’s record signal path includes both automatic
gain control (AGC) for the microphone inputs and a digi­tal noise gate at the output of the ADC (Figure 10).

Microphone AGC

The IC’s AGC monitors the signal level at the output of
the ADC and then adjusts the MIC1 and MIC2 analog
PGA settings automatically. When the signal level is
below the predefined threshold, the gain is increased up
to its maximum (20dB). If the signal exceeds the thresh­old, the gain is reduced to prevent the output signal level
exceeding the threshold. When AGC is enabled, the
microphone PGA is not user programmable. The AGC
provides a more constant signal level and improves the
available ADC dynamic range.

PGAM1:

+20dB TO -6dB

AUTOMATIC

PA1EN:
0/20/30dB

+20dB TO 0dB

PA2EN:
0/20/30dB

PGAM2:

MIX

MIXADL

MIX

MIXADR

ADLEN

ADREN

CONTROL

ADCL

ADCR

Figure 10. Record Path Signal Processing Block Diagram

GAIN

AVLG: 0/6/12/18dB
AVL: 3dB TO -12dB

AVRG: 0/6/12/18dB
AVR: 3dB TO -2dB

NOISE GATE

AUDIO/

VOICE

FILTERS

MODE1
AVFLT

Noise Gate

Since the AGC increases the levels of all signals below
a user-defined threshold, the noise floor is effectively
increased by 20dB. To counteract this, the noise gate
reduces the gain at low signal levels. Unlike typical noise
gates that completely silence the output below a defined
level, the noise gate in the IC applies downward expan­sion. The noise gate attenuates the output at a rate of
1dB for each 2dB the signal is below the threshold.

The noise gate can be used in conjunction with the AGC
or on its own. When the AGC is enabled, the noise gate
reduces the output level only when the AGC has set the
gain to the maximum setting. Figure 11 shows the gain
response resulting from using the AGC and noise gate.

AGC AND NOISE GATE

AMPLITUDE RESPONSE

0

-20

AGC AND NOISE GATE

-40

-60

-80

OUTPUT AMPLITUDE (dBFS)

-100

-120

-120 0

Figure 11. AGC and Noise Gate Input vs. Output Gain

AGC ONLY

AGC AND NOISE

GATE DISABLED

NOISE GATE ONLY

-20-40-60-80-100

INPUT AMPLITUDE (dBFS)

64

Stereo Audio CODEC

with FlexSound Technology

Table 6. Record Path Signal Processing Registers

REGISTER BIT NAME DESCRIPTION

Noise Gate Attenuation

Reports the current noise gate attenuation.
000 = 0dB
001 = 1dB
010 = 2dB
011 = 3dB to 5dB
100 = 6dB to 7dB
101 = 8dB to 9dB
110 = 10dB to 11dB
111 = 12dB

AGC Gain

Reports the current AGC gain setting.

VALUE GAIN (dB) VALUE GAIN (dB)

0x00 +20 0x0B +9
0x01 +19 0x0C +8
0x02 +18 0x0D +7
0x03 +17 0x0E +6
0x04 +16 0x0F +5
0x05 +15 0x10 +4
0x06 +14 0x11 +3
0x07 +13 0x12 +2
0x08 +12 0x13 +1
0x09 +11 0x14 to 0x1F 0
0x0A +10

AGC/Noise Gate Signal Source

Determines which ADC channel the AGC and noise gates analyze. Gain is adjusted on
both channels regardless of the AGCSRC setting.
0 = Left ADC output
1 = Maximum of either the left or right ADC output

AGC Release Time

Defined as the duration from start to finish of gain increase in the region shown in Figure

12. Release times are longer for low AGC threshold levels.
000 = 78ms
001 = 156ms
010 = 312ms
011 = 625ms
100 = 1.25s
101 = 2.5s
110 = 5s
111 = 10s

0x01

0x3D

7

6

5

4

3

2

1

0

7 AGCSRC

6

5

4

NG

AGC

AGCRLS

MAX9888

65

Stereo Audio CODEC
with FlexSound Technology

Table 6. Record Path Signal Processing Registers (continued)

REGISTER BIT NAME DESCRIPTION

AGC Attack Time

3

MAX9888

0x3D

0x3E

2

1

0

7

6

5

4

3

2

1

0

AGCATK

AGCHLD

ANTH

AGCTH

Defined as the time required to reduce gain by 63% of the total gain reduction (one time
constant of the exponential response). Attack times are longer for low AGC threshold
levels. See Figure 12 for details.
00 = 2ms
01 = 7.2ms
10 = 31ms
11 = 123ms

AGC Hold Time

The delay before the AGC release begins. The hold time counter starts whenever the
signal drops below the AGC threshold and is reset by any signal that exceeds the
threshold. Set AGCHLD to enable the AGC circuit. See Figure 12 for details.
00 = AGC disabled
01 = 50ms
10 = 100ms
11 = 400ms

Noise Gate Threshold

Gain is reduced for signals below the threshold to quiet noise. The thresholds are relative
to the ADC’s full-scale output voltage.

VALUE

0x0 Noise gate disabled 0x8 -45
0x1 Reserved 0x9 -41
0x2 Reserved 0xA -38
0x3 -64 0xB -34
0x4 -62 0xC -30

0x5 -58 0xD -27
0x6 -53 0xE -22
0x7 -50 0xF -16

AGC Threshold

Gain is reduced when signals exceed the threshold to prevent clipping. The thresholds
are relative to the ADC’s full-scale voltage.

VALUE

0x0 -3 0x8 -11
0x1 -4 0x9 -12
0x2 -5 0xA -13
0x3 -6 0xB -14
0x4 -7 0xC -15
0x5 -8 0xD -16
0x6 -9 0xE -17
0x7 -10 0xF -18

THRESHOLD

(dBFS)

THRESHOLD

(dBFS)

VALUE

VALUE

THRESHOLD

(dBFS)

THRESHOLD

(dBFS)

66

Stereo Audio CODEC

with FlexSound Technology

MAX9888

ATTACK TIME

Figure 12. AGC Timing

HOLD TIME RELEASE TIME

ADC Record Level Control

The IC includes separate digital level control for the left
and right ADC outputs (Figure 13). To optimize dynamic

ADLEN

ADCL

range, use analog gain to adjust the signal level and set
the digital level control to 0dB whenever possible. Digital
level control is primarily used when adjusting the record
level for digital microphones.

NOISE GATE

AUTOMATIC

GAIN CONTROL

AVLG: 0/6/12/18dB
AVL: 3dB TO -12dB

AUDIO/

VOICE

FILTERS

MODE1
AVFLT1

ADCR

ADREN

Figure 13. ADC Record Level Control Block Diagram

AVRG: 0/6/12/18dB
AVR: 3dB TO -2dB

67

Stereo Audio CODEC
with FlexSound Technology

Table 7. ADC Record Level Control Register

REGISTER BIT NAME DESCRIPTION

5

4

MAX9888

0x2F/0x30

3

2

1

0

AVLG/AVRG

AVL/AVR

Left/Right ADC Gain

00 = 0dB
01 = 6dB
10 = 12dB
11 = 18dB

Left/Right ADC Level

VALUE GAIN (dB) VALUE GAIN (dB)

0x0 +3 0x8 -5
0x1 +2 0x9 -6
0x2 +1 0xA -7
0x3 0 0xB -8
0x4 -1 0xC -9
0x5 -2 0xD -10
0x6 -3 0xE -11
0x7 -4 0xF -12

Sidetone

Enable sidetone during full-duplex operation to add a
low-level copy of the recorded audio signal to the play­back audio signal (Figure 14). Sidetone is commonly

DVST:
0dB TO -60dB

ADLEN

ADREN

ADCL

ADCR

SIDETONE

AUTOMATIC

GAIN

CONTROL

AVLG: 0/6/12/18dB
AVL: 3dB TO -12dB

AVRG: 0/6/12/18dB
AVR: 3dB TO -2dB

DSTS

NOISE GATE

MIX

AUDIO/

VOICE

FILTERS

MODE1
AVFLT

+

5-BAND

PARAMETRIC

EQ

used in telephony to allow the speaker to hear himself
speak, providing a more natural user experience. The
IC implements sidetone digitally. Doing so helps prevent
unwanted feedback into the playback signal path and
better matches the playback audio signal.

DV1G:
0/6/12/18dB

MULTIBAND ALC

DVEQ1:
0dB TO -15dB

EQ1EN EQ2EN

EXCURSION LIMITER

5-BAND

PARAMETRIC

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

DVEQ2:
0dB TO -15dB

DCB2

MODE1
DVFLT

AUDIO/

FILTERS

AUDIO/

VOICE

FILTERS

MIXDAL

MIX

MIXDAR

MIX

DACL

DALEN

DACR

DAREN

Figure 14. Sidetone Block Diagram

68

Stereo Audio CODEC

with FlexSound Technology

Table 8. Sidetone Register

REGISTER BIT NAME DESCRIPTION

Sidetone Source

Selects which ADC output is fed back as sidetone. When mixing the left and right ADC
outputs, each is attenuated by 6dB to prevent full-scale signals from clipping.
00 = Sidetone disabled
01 = Left ADC
10 = Right ADC
11 = Left + Right ADC

Sidetone Level

Adjusts the sidetone signal level. All levels are referenced to the ADC’s full-scale output.

VALUE LEVEL (dB) VALUE LEVEL (dB)

0x00 Sidetone disabled 0x10 -30.5
0x01 -0.5 0x11 -32.5
0x02 -2.5 0x12 -34.5
0x03 -4.5 0x13 -36.5
0x04 -6.5 0x14 -38.5
0x05 -8.5 0x15 -40.5
0x06 -10.5 0x16 -42.5
0x07 -12.5 0x17 -44.5
0x08 -14.5 0x18 -46.5
0x09 -16.5 0x19 -48.5
0x0A -18.5 0x1A -50.5

0x0B -20.5 0x1B -52.5
0x0C -22.5 0x1C -54.5
0x0D -24.5 0x1D -56.6

0x0E -26.5 0x1E -58.5

0x0F -28.5 0x1F -60.5

0x2A

7

DSTS

6

4

3

2

1

0

DVST

MAX9888

Digital Audio Interfaces

The IC includes two separate playback signal paths and
one record signal path. Digital audio interface 1 (DAI1)
is used to transmit the recorded stereo audio signal and
receive a stereo audio signal for playback. Digital audio
interface 2 (DAI2) is used to receive a second stereo
audio signal. Use DAI1 for all full-duplex operations and
for all voice signals. Use DAI2 for music and to mix two
playback audio signals. The digital audio interfaces are
separate from the audio ports to enable either interface
to communicate with any external device connected to
the audio ports.

Each audio interface can be configured in a variety of

2

formats including left justified, I

S, PCM, and time divi­sion multiplexed (TDM). TDM mode supports up to 4
mono audio slots in each frame. The IC can use up to

2 mono slots per interface, leaving the remaining two
slots available for another device. Table 9 shows how to
configure the device for common digital audio formats.
Figures 16 and 17 show examples of common audio
formats. By default, SDOUTS1 and SDOUTS2 are set
high impedance when the IC is not outputting data to
facilitate sharing the bus. Configure the interface in TDM
mode using only slot 1 to transmit and receive mono
PCM voice data.

The IC’s digital audio interfaces support both ADC to
DAC loop-through and digital loopback. Loop-through
allows the signal converted by the ADC to be routed
to the DAC for playback. The signal is routed from the
record path to the playback path in the digital audio
interface to allow the IC’s full complement of digital
signal processing to be used. Loopback allows digital

69

Stereo Audio CODEC
with FlexSound Technology

data input to either SDINS1 or SDINS2 to be routed
from one interface to the other for output on SDOUTS2
or SDOUTS1. Both interfaces must be configured for
the same sample rate, but the interface format need

MAX9888

BCLKS1

DAI1

LRCLKS1 SDOUTS1 SDINS1 DVDDS1 BCLKS2 LRCLKS2 SDOUTS2 SDINS2 DVDDS2

PORT S1 PORT S1

SEL1 SEL2

BCLK1

MAS1

BIT

CLOCK

LRCLK1

FRAME
CLOCK

MAS1

SDOUT1

HIZOFF1

DATA

OUTPUT

SDIN1

DATA

INPUT

not be the same. This allows the IC to route audio data
from one device to another, converting the data format
as needed. Figure 15 shows the available digital signal
routing options.

SDIN2

HIZOFF2

DATA

INPUT

DAI2

MAS2

BCLK2

BIT

CLOCK

LRCLK2

FRAME
CLOCK

SDOUT2

MAS2

DATA

OUTPUT

LBEN1

MUX

LBEN2

+

LTEN1

DAI1

RECORD PATH

Figure 15. Digital Audio Signal Routing

Table 9. Common Digital Audio Formats

MODE WCI1/WCI2 BCI1/BCI2 DLY1/DLY2 TDM1/TDM2 SLOTL1/SLOTL2 SLOTR1/SLOTR2

Left Justified Set as desired Set as desired 0 0 X X

2

S 1 0 1 0 X X

I
PCM X 1 X 1 0 0
TDM X 1 X 1 Set as desired

X = Don’t care.

70

DAI1

PLAYBACK PATH

DAI2

PLAYBACK PATH

with FlexSound Technology

Table 10. Digital Audio Interface Registers

REGISTER BIT NAME DESCRIPTION

DAI1/DAI2 Master Mode

In master mode, DAI1/DAI2 outputs LRCLK and BCLK. In slave mode, DAI1/DAI2

7 MAS1/MAS2

6 WCI1/WCI2

5 BCI1/BCI2

0x14/0x1C

4 DLY1/DLY2

2 TDM1/TDM2

1 FSW1/FSW2

0 WS1/WS2

accept LRCLK and BCLK as inputs.
0 = Slave mode
1 = Master mode

DAI1/DAI2 Word Clock Invert

TDM1/TDM2 = 0:
0 = Left-channel data is transmitted while LRCLK is low.
1 = Right-channel data is transmitted while LRCLK is low.
TDM1/TDM2 = 1:
Always set WCI = 0.

DAI1/DAI2 Bit Clock Invert

BCI1/BCI2 must be set to 1 when TDM1/TDM2 = 1.
0 = SDIN is accepted on the rising edge of BCLK.

SDOUT is valid on the rising edge of BCLK.

1 = SDIN is accepted on the falling edge of BCLK.

SDOUT is valid on the falling edge of BCLK.
Master Mode:
0 = LRCLK transitions on the falling edge of BCLK.
1 = LRCLK transitions on the rising edge of BCLK.

DAI1/DAI2 Data Delay

DLY1/DLY2 has no effect when TDM1/TDM2 = 1.
0 = The most significant data bit is clocked on the first active BCLK edge after an

LRCLK transition.

1 = The most significant data bit is clocked on the second active BCLK edge after an

LRCLK transition.

DAI1/DAI2 Time-Division Multiplex Mode (TDM Mode)

Set TDM1/TDM2 when communicating with devices that use a frame synchronization
pulse on LRCLK instead of a square wave.
0 = Disabled
1 = Enabled (BCI1/BCI2 must be set to 1)

DAI1/DAI2 Wide Frame Sync Pulse

Increases the width of the frame sync pulse to the full data width when TDM1/TDM2 =

1. FSW1/FSW2 has no effect when TDM1/TDM2 = 0.
0 = Disabled
1 = Enabled

DAI1/DAI2 Audio Data Bit Depth

Determines the maximum bit depth of audio being transmitted and received. Data is
always 16 bit when TDM1/TMD2 = 0.
0 = 16 bits
1 = 24 bits

Stereo Audio CODEC

MAX9888

71

Stereo Audio CODEC
with FlexSound Technology

Table 10. Digital Audio Interface Registers (continued)

REGISTER BIT NAME DESCRIPTION

ADC Oversampling Ratio

Use the higher setting for maximum performance. Use the lower setting for reduced
power consumption at the expense of performance.
00 = 96x
01 = 64x
10 = Reserved
11 = Reserved

DAI1/DAI2 BCLK Output Frequency

When operating in master mode, BSEL1/BSEL2 set the frequency of BCLK. When
operating in slave mode, BSEL1/BSEL2 have no effect. Select the lowest BCLK
frequency that clocks all data input to the DAC and output by the ADC.
000 = BCLK disabled
001 = 64 x LRCLK
010 = 48 x LRCLK
011 = 128 x LRCLK (invalid for DHF1/DHF2 = 1)
100 = PCLK/2
101 = PCLK/4
110 = PCLK/8
111 = PCLK/16

DAI1/DAI2 Audio Port Selector

Selects which port is used by DAI1/DAI2.
00 = None
01 = Port S1
10 = Port S2
11 = Reserved

DAI1 Digital Loopthrough

Connects the output of the record signal path to the input of the playback path. Data
input to DAI1 from an external device is mixed with the recorded audio signal.
0 = Disabled
1 = Enabled

DAI1/DAI2 Digital Audio Interface Loopback

LBEN1 routes the digital audio input to DAI1 back out on DAI2. LBEN2 routes the
digital audio input to DAI2 back out on DAI1. Selecting LBEN2 disables the ADC
output data.
0 = Disabled
1 = Enabled

DAI1/DAI2 DAC Mono Mix

Mixes the left and right digital input to mono and routes the combined signal to the left
and right playback paths. The left and right input data is attenuated by 6dB prior to the
mono mix.
0 = Disabled
1 = Enabled

MAX9888

0x15/0x1D

0x16/0x1E

7

OSR1

6

2

1

0

7

6

5 LTEN1

4

3

BSEL1/

BSEL2

SEL1/SEL2

LBEN1/

LBEN2

DMONO1/

DMONO2

72

Stereo Audio CODEC

with FlexSound Technology

Table 10. Digital Audio Interface Registers (continued)

REGISTER BIT NAME DESCRIPTION

Disable DA1/DAI2 Output High-Impedance Mode

Normally SDOUT is set high impedance between data words. Set HIZOFF1/HIZOFF2 to
force a level on SDOUT at all times.
0 = Disabled
1 = Enabled

DAI1/DAI2 Record Path Output Enable

DAI2 outputs data only if LBEN1 = 1.
0 = Disabled
1 = Enabled

DAI1/DAI2 Playback Path Input Enable

0 = Disabled
1 = Enabled

TDM Left Time Slot

Selects which of the four slots is used for left data on DAI1/DAI2. If the same slot is
selected for left and right audio, left audio is placed in the slot.
00 = Slot 1
01 = Slot 2
10 = Slot 3
11 = Slot 4

TDM Right Time Slot

Selects which of the four slots is used for right data on DAI1/DAI2. If the same slot is
selected for left and right audio, left audio is placed in the slot.
00 = Slot 1
01 = Slot 2
10 = Slot 3
11 = Slot 4

TDM Slot Delay

Adds 1 BCLK cycle delay to the data in the specified TDM slot.
1xxx = Slot 4 delayed
x1xx = Slot 3 delayed
xx1x = Slot 2 delayed
xxx1 = Slot 1 delayed

0x16/0x1E

0x17/0x1F

2

1

0

7

6

5

4

3

2

1

0

HIZOFF1/

HIZOFF2

SDOEN1/

SDOEN2

SDIEN1/

SDIEN2

SLOTL1/

SLOTL2

SLOTR1/

SLOTR2

SLOTDLY1/

SLOTDLY2

MAX9888

73

Stereo Audio CODEC
with FlexSound Technology

WCI_ = 0, BCI_ = 0, DLY_ = 0, TDM_ = 0, FSW_ = 0, WS_ = 0, HIZOFF_ = 1, SLOTL_ = 0, SLOTR_ = 0

LRCLK

SDOUT

MAX9888

BCLK

SDIN

LRCLK

SDOUT

BCLK

SDIN

LRCLK

SDOUT

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

WCI_ = 1, BCI_ = 0, DLY_ = 0, TDM_ = 0, FSW_ = 0, WS_ = 0, HIZOFF_ = 1, SLOTL_ = 0, SLOTR_ = 0

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 0, FSW_ = 0, WS_ = 0, HIZOFF_ = 1, SLOTL_ =

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

LEFT

LEFT

LEFT

RIGHT

RIGHT

0, SLOTR_ = 0

RIGHT

BCLK

SDIN

LRCLK

SDOUT

BCLK

SDIN

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

WCI_ = 0, BCI_ = 0, DLY_ = 1, TDM_ = 0, FSW_ = 0, WS_ = 0, HIZOFF_ = 1, SLOTL_ = 0, SLOTR_ = 0

LEFT

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Figure 16. Non-TDM Data Format Examples

74

RIGHT

with FlexSound Technology

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 1, FSW_ = 0, WS_ = 0, HIZOFF_ = 0, SLOTL_ = 0, SLOTR_ = 1

LRCLK

Stereo Audio CODEC

MAX9888

HI-Z

SDOUT

BCLK

SDIN

LRCLK

SDOUT

BCLK

SDIN

LRCLK

SDOUT

BCLK

SDIN

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 1, FSW_ = 1, WS_ = 0, HIZOFF_ = 0, SLOTL_ = 0, SLOTR_ = 1

HI-Z

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 1, FSW_ = 0, WS_ = 0, HIZOFF_ = 1, SLOTL_ = 0, SLOTR_ = 1

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

HI-Z

HI-Z

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 1, FSW_ = 0, WS_ = 0, HIZOFF_ = 0, SLOTL_ = 2, SLOTR_ = 3

LRCLK

SDOUT

BCLK

SDIN

LRCLK

SDOUT

BCLK

SDIN

HI-Z

32 CYCLES

WCI_ = 0, BCI_ = 1, DLY_ = 0, TDM_ = 1, FSW_ = 0, WS_ = 0, HIZOFF_ = 0, SLOTL_ = 0, SLOTR_ = 1

HI-Z

L L L L L L L L R R R R R R R R

HI-Z

L L L L L L L L 1 1 1 1 R R R R

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

L15 L14 L13 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

16 CYCLES 16 CYCLES 16 CYCLES 16 CYCLES

Figure 17. TDM Mode Data Format Examples

HI-Z

HI-Z

75

Stereo Audio CODEC
with FlexSound Technology

Clock Control

The digital signal paths in the IC require a master
clock (MCLK) between 10MHz and 60MHz to func­tion. Internally, the MAX9888 requires a clock between
10MHz and 20MHz. A prescaler divides MCLK by 1, 2,
or 4 to create the internal clock (PCLK). PCLK is used to
clock all portions of the IC.

The MAX9888 includes two digital audio signal paths,

MAX9888

both capable of supporting any sample rate from 8kHz
to 96kHz. Each path is independently configured to allow
different sample rates. To accommodate a wide range
of system architectures, three main clocking modes are
supported:

PLL Mode: When operating in slave mode, enable

U

the PLL to lock onto any LRCLK input. This mode

requires the least configuration, but provides the
lowest performance. Use this mode to simplify initial
setup or when normal mode and exact integer mode
cannot be used.

Normal Mode: This mode uses a 15-bit clock divider

U

to set the sample rate relative to PCLK. This allows
high flexibility in both the PCLK and LRCLK frequen­cies and can be used in either master or slave mode.

Exact Integer Mode (DAI1 only): In both master and

U

slave modes, common MCLK frequencies (12MHz,
13MHz, 16MHz, and 19.2MHz) can be programmed
to operate in exact integer mode for both 8kHz and
16kHz sample rates. In these modes, the MCLK and
LRCLK rates are selected by using the FREQ1 bits
instead of the NI, and PLL control bits.

Table 11. Clock Control Registers

REGISTER BIT NAME DESCRIPTION

MCLK Prescaler

0x10

0x11/0x19

5

PSCLK

4

7

6

SR1/SR2

5

4

Generates PCLK, which is used by all internal circuitry.
00 = PCLK disabled
01 = 10MHz P MCLK P 20MHz (PCLK = MCLK)
10 = 20MHz P MCLK P 40MHz (PCLK = MCLK/2)
11 = 40MHz P MCLK P 60MHz (PCLK = MCLK/4)

DAI1/DAI2 Sample Rate

Used by the ALC to correctly set the dual-band crossover frequency and the excursion
limiter to set the predefined corner frequencies.

VALUE

0x0 Reserved 0x8 48
0x1 8 0x9 88.2
0x2 11.025 0xA 96
0x3 16 0xB Reserved
0x4 22.05 0xC Reserved
0x5 24 0xD Reserved
0x6 32 0xE Reserved
0x7 44.1 0xF Reserved

SAMPLE RATE

(kHz)

VALUE

SAMPLE RATE

(kHz)

76

Stereo Audio CODEC

with FlexSound Technology

Table 11. Clock Control Registers (continued)

REGISTER BIT NAME DESCRIPTION

Exact Integer Mode

Overrides PLL1 and NI1 and configures a specific PCLK to LRCLK ratio.

0x11

0x12/0x1A

0x13/0x1B

3

2

1

7 PLL1/PLL2

6
5
4
3
2
1
0
7
6
5
4
3
2
1

0 NI1[0]/NI2[0]

FREQ1

NI1/

NI2

VALUE SAMPLE RATE VALUE SAMPLE RATE

0x0 Disabled 0x8

0x1 Reserved 0x9

0x2 Reserved 0xA

0x3 Reserved 0xB

0x4 Reserved 0xC

0x5 Reserved 0xD

0x6 Reserved 0xE

0x7 Reserved 0xF

PLL Mode Enable (Slave Mode Only)

PLL1/PLL2 enables a digital PLL that locks on to the externally supplied LRCLK
frequency and automatically sets the LRCLK divider (NI1/NI2).
0 = Disabled
1 = Enabled

Normal Mode LRCLK Divider

When PLL1/PLL2 = 0, the frequency of LRCLK is determined by NI1/NI2. See Table 12
for common NI values.

SAMPLE RATE DHF1/DHF2 NI1/NI2 FORMULA

8kHz P LRCLK P 48kHz 0

48kHz < LRCLK P 96kHz 1

= LRCLK frequency

f

LRCLK

f

= Prescaled MCLK frequency (PCLK)

PCLK

Rapid Lock Mode

Program NI1/NI2 to the nearest valid ratio and set NI1[0]/NI2[0] when PLL1/PLL2 = 1
to enable rapid lock mode. Normally, the PLL automatically calculates and dynamically
adjusts NI1/NI2. When rapid lock mode is properly configured, the PLL starting point is
much closer to the correct value, thus speeding up lock time. Wait one LRCLK period
after programming NI1/NI2 before setting PLL1/PLL2 = 1.

PCLK = 12MHz,

LRCLK = 8kHz

PCLK = 12MHz,
LRCLK = 16kHz

PCLK = 13MHz,

LRCLK = 8kHz

PCLK = 13MHz,
LRCLK = 16kHz

PCLK = 16MHz,

LRCLK = 8kHz

PCLK = 16MHz,
LRCLK = 16kHz

PCLK = 19.2MHz,

LRCLK = 8kHz

PCLK = 19.2MHz,

LRCLK = 16kHz

65536 96 f

NI

=

65536 48 f

NI

=

× ×

f

PCLK

× ×

f

PCLK

MAX9888

LRCLK

LRCLK

77

Stereo Audio CODEC
with FlexSound Technology

Table 12. Common NI1/NI2 Values

LRCLK (kHz)

PCLK (MHz)

8 11.025 12 16 22.05 24 32 44.1 48 64 88.2 96
10
11

11.2896

MAX9888

12

12.288 1000
13
16

16.9344

18.432
20

13A9 1B18 1D7E 2752 3631 3AFB 4EA5 6C61 75F7 4EA5 6C61 75F7
11E0 18A2 1ACF 23BF 3144 359F 477E 6287 6B3E 477E 6287 6B3E
116A

1800

1A1F 22D4

1062 1694 1893 20C5 2D29 3127 4189 5A51 624E 4189 5A51 624E

160D

1800 2000

0F20 14D8 16AF 1E3F 29AF 2D5F 3C7F 535F 5ABE 3C7F 535F 5ABE
0C4A 10EF 126F 1893 21DE 24DD 3127 43BD 49BA 3127 43BD 49BA
0B9C
0AAB 0EB3

1000

116A 1738

1000

09D5 0D8C 0EBF 13A9 1B18 1D7E 2752 3631 3AFB 2752 3631 3AFB

Note: Values in bold are exact integers that provide maximum full-scale performance.

DHF1/2 = 0 DHF1/2 = 1

3000

2C1A

2000

1555 1D66

343F 45A9

3000 4000

22D4 2E71

2000

2AAB 3ACD

6000

5833

4000

687D 45A9

6000 4000

45A9 2E71

4000

2AAB 3ACD

6000

5833

4000

687D

6000

45A9

4000

Passband Filtering

Each digital signal path in the IC includes options for
defining the path bandwidth (Figure 18). The playback
and record paths connected to DAI1 support both voice
and music filtering while the playback path connected to
DAI2 supports music filtering only.

The voice IIR filters provide greater than 70dB stopband
attenuation at frequencies above f

/2 to reduce aliasing.

S

Three selectable highpass filters eliminate unwanted
low-frequency signals.

DVST:
0dB TO -60d B

ADLEN

ADREN

ADCL

ADCR

SIDETONE

AUTOMATIC

GAIN

CONTROL

AVLG: 0/6/12/18dB
AVL: 3dB TO -12dB

AVRG: 0/6/12/18dB
AVR: 3dB TO -2dB

DSTS

NOISE GATE

MIX

AUDIO/

VOICE

FILTERS

MODE1
AVFLT

+

5-BAND

PARAMETRIC

EQ

Use music mode when processing high-fidelity audio
content. The music FIR filters reduce power consump­tion and are linear phase to maintain stereo imaging.
An optional DC-blocking filter is available to eliminate
unwanted DC offset.

In music mode, a second set of FIR filters are available
to support sample rates greater than 50kHz. The filters
can be independently selected for DAI1 and DAI2 and
support both the playback and record audio paths.

DV1G:
0/6/12/18dB

MULTIBAND ALC

DVEQ1:
0dB TO -15dB

EQ1EN EQ2EN

EXCURSION LIMITER

5-BAND

PARAMETRIC

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

DVEQ2:
0dB TO -15dB

DCB2

MODE1
DVFLT

AUDIO/

FILTERS

AUDIO/

VOICE

FILTERS

MIXDAL

MIX

MIXDAR

MIX

DACL

DALEN

DACR

DAREN

Figure 18. Digital Passband Filtering Block Diagram

78

Stereo Audio CODEC

with FlexSound Technology

Table 13. Passband Filtering Registers

REGISTER BIT NAME DESCRIPTION

DAI1 Passband Filtering Mode

0 = Voice filters
1 = Music filters (recommended for f

DAI1 ADC Highpass Filter Mode

MODE1 AVFLT1

0 See Table 14
1 Select a nonzero value to enable the DC-blocking filter

DAI1 High Sample Rate Mode

Selects the sample rate range.
0 = 8kHz P LRCLK P 48kHz
1 = 48kHz P LRCLK < 96kHz

> 24kHz)

S

0x18

7 MODE1

6

5

4

3 DHF1

AVFLT1

MAX9888

0x20

2

1

0

3 DHF2

0 DCB2

DVFLT1

DAI1 DAC Highpass Filter Mode

MODE1 DVFLT1

0 See Table 14
1 Select a nonzero value to enable the DC-blocking filter

DAI2 High Sample Rate Mode

Selects the sample rate range.
0 = 8kHz P LRCLK P 48kHz
1 = 48kHz < LRCLK P 96kHz

DAI2 DC Blocking Filter

Enables a DC-blocking filter on the DAI2 playback audio path.
0 = Disabled
1 = Enabled

79

Stereo Audio CODEC

AMPLITUDE (dB)

AMPLITUDE (dB)

0

AMPLITUDE (dB)

with FlexSound Technology

Table 14. Voice Highpass Filters

AVFTL/DVFLT VALUE INTENDED SAMPLE RATE FILTER RESPONSE

000 N/A Disabled

0

-10

MAX9888

001/011 16kHz/8kHz

010/100 16kHz/8kHz

-20

-30

-40

-50

-60
0 1000

FREQUENCY (Hz)

-10

-20

-30

-40

-50

-60
0 1000

FREQUENCY (Hz)

0

800600400200

800600400200

80

-10

-20

-30

101 8kHz to 48kHz

-40

-50

-60
0 1000

FREQUENCY (Hz)

110/111 N/A Reserved

LRCLK = 48kHz

800600400200

with FlexSound Technology

Playback Path Signal Processing

The IC playback signal path includes automatic level
control (ALC) and a 5-band parametric equalizer (EQ)
(Figure 19). The DAI1 and DAI2 playback paths include
separate ALCs controlled by a single set of registers.
Two completely separate parametric EQs are included
for the DAI1 and DAI2 playback paths.

Automatic Level Control

The automatic level control (ALC) circuit ensures maxi­mum signal amplitude without producing audible clip­ping. This is accomplished by a variable gain stage that
works on a sample by sample basis to increase the gain
up to 12dB. A look-ahead circuit determines if the next
sample exceeds full scale and reduces the gain so that
the sample is exactly full scale.

A programmable low signal threshold determines the
minimum signal amplitude that is amplified. Select a
threshold that prevents the amplification of background
noise. When the signal level drops below the low signal
threshold, the ALC reduces the gain to 0dB until the sig­nal increases above the threshold. Figure 20 shows an
example of ALC input vs. output curves.

Stereo Audio CODEC

The ALC can optionally be configured in dual-band
mode. In this mode, the input signal is filtered into two
bands with a 5kHz center frequency. Each band is
routed through independent ALCs and then summed
together. In multiband mode, both bands use the same
parameters.

OUTPUT SIGNAL

(dBFS)

0

INPUT
SIGNAL
(dBFS)

OUTPUT SIGNAL

(dBFS)

0

LOW-LEVEL
THRESHOLD

ALC W ITH ALCTH ≠ 000

-12 0

MAX9888

DV1G:
0/6/12/18dB

+

MULTIBAND ALC

DVEQ1:
0dB TO -15dB

5-BAND

PARAMETRIC

EQ

EQ1EN EQ2EN

EXCURSION LIMITER

5-BAND

PARAMETRIC

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

DVEQ2:
0dB TO -15dB

FILTERS

DCB2

FILTERS

MODE1
DVFLT

AUDIO/

AUDIO/

VOICE

MIXDAL

MIX

MIXDAR

MIX

DACL

DALEN

DACR

DAREN

INPUT
SIGNAL
(dBFS)

INPUT
SIGNAL
(dBFS)

OUTPUT SIGNAL

(dBFS)

0

LOW-LEVEL

THRESHOLD

ALC W ITH ALCTH = 000

LOW-LEVEL
THRESHOLD

ALC D ISABLED

-12 0

-12 0

Figure 20. ALC Input vs. Output ExamplesFigure 19. Playback Path Signal Processing Block Diagram

81

Stereo Audio CODEC
with FlexSound Technology

Table 15. Automatic Level Control Registers

REGISTER BIT NAME DESCRIPTION

ALC Enable

7 ALCEN

MAX9888

6

5

0x41

4

3 ALCMB

2

1

0

ALCRLS

ALCTH

Enables ALC on both the DAI1 and DAI2 playback paths.
0 = Disabled
1 = Enabled

ALC and Excursion Limiter Release Time

Sets the release time for both the ALC and Excursion Limiter. See the Excursion
Limiter section for Excursion Limiter release times. ALC release time is defined as the

time required to adjust the gain from 12dB to 0dB.

VALUE ALC RELEASE TIME (s)

000 8
001 4
010 2
011 1
100 0.5
101 0.25
110 Reserved
111 Reserved

Multiband Enable

Enables dual-band processing with a 5kHz center frequency. SR1 and SR2 must be
configured properly to achieve the correct center frequency for each playback path.
0 = Single-band ALC
1 = Dual-band ALC

Low Signal Threshold

Selects the minimum signal level to be boosted by the ALC.
000 = -JdB (low-signal threshold disabled)
001 = -12dB
010 = -18dB
011 = -24dB
100 = -30dB
101 = -36dB
110 = -42dB
111 = -48dB

Parametric Equalizer

The parametric EQ contains five independent biquad
filters with programmable gain, center frequency, and
bandwidth. Each biquad filter has a gain range of Q12dB
and a center frequency range from 20Hz to 20kHz. Use a
filter Q less than that shown in Figure 21 to achieve ideal
frequency responses. Setting a higher Q results in non­ideal frequency response. The biquad filters are series
connected, allowing a total gain of Q60dB.

82

1000

fs = 8kHz

100

10

1

MAXIMUM RECOMMENDED FILTER Q

0.1
100 100,000

Figure 21. Maximum Recommended Filter Q vs. Frequency

CENTER FREQUENCY (Hz)

fs = 48kHz

fs = 96kHz

10,0001000

Stereo Audio CODEC

with FlexSound Technology

Use the attenuator at the EQ’s input to avoid clipping
the signal. The attenuator can be programmed for fixed
attenuation or dynamic attenuation based on signal level.
If the dynamic EQ clip detection is enabled, the signal
level from the EQ is fed back to the attenuator circuit to
determine the amount of gain reduction necessary to
avoid clipping.

Table 16. EQ Registers

REGISTER BIT NAME DESCRIPTION

DAI1/DAI2 EQ Clip Detection

Automatically controls the EQ attenuator to prevent clipping in the EQ.
0 = Enabled
1 = Disabled

DAI1/DAI2 EQ Attenuator

Provides attenuation to prevent clipping in the EQ when full-scale signals are boost­ed. DVEQ1/DVEQ2 operates only when EQ1EN/EQ2EN = 1 and EQCLP1/EQCLP2
= 1.

VALUE GAIN (dB) VALUE GAIN (dB)

0x0 0 0x8 -8
0x1 -1 0x9 -9
0x2 -2 0xA -10
0x3 -3 0xB -11
0x4 -4 0xC -12
0x5 -5 0xD -13
0x6 -6 0xE -14
0x7 -7 0xF -15

0x2C/0x2E

4

3

2

1

0

EQCLP1/

EQCLP2

DVEQ1/DVEQ2

The MAX9888 EV kit software includes a graphic inter­face for generating the EQ coefficients. The coefficients
are sample rate dependent and stored in registers 0x50
through 0xB3.

MAX9888

0x47

7

6

5

1 EQ2EN

0 EQ1EN

VS2EN

VSEN

ZDEN

See the Click-and-Pop Reduction section.

DAI2 EQ Enable

0 = Disabled
1 = Enabled

DAI1 EQ Enable

0 = Disabled
1 = Enabled

83

Stereo Audio CODEC
with FlexSound Technology

Playback Level Control

The IC includes separate digital level control for the DAI1
and DAI2 playback audio paths. The DAI1 signal path

DV1G:
0/6/12/18dB

MAX9888

+

MULTIBAND ALC

DVEQ1:
0dB TO -15dB

5-BAND

PARAMETRIC

EQ

EQ1EN EQ2EN

EXCURSION LIMITER

5-BAND

PARAMETRIC

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

DVEQ2:
0dB TO -15dB

allows boost when MODE1 = 0 and attenuation in any
mode. The DAI2 signal path allows attenuation only.

MIXDAL

DACL

DALEN

DACR

DAREN

AUDIO/

FILTERS

DCB2

AUDIO/

FILTERS

MODE1
DVFLT

VOICE

MIX

MIXDAR

MIX

Figure 22. Playback Level Control Block Diagram

Table 17. DAC Playback Level Control Register

REGISTER BIT NAME DESCRIPTION

DAI1/DAI2 Mute

0 = Disabled
1 = Enabled

DAI1 Voice Mode Gain

DV1G only applies when MODE1 = 0.
00 = 0dB
01 = 6dB
10 = 12dB
11 = 18dB

DAI1/DAI2 Attenuation

VALUE GAIN (dB) VALUE GAIN (dB)

0x0 0 0x8 -8
0x1 -1 0x9 -9
0x2 -2 0xA -10
0x3 -3 0xB -11
0x4 -4 0xC -12
0x5 -5 0xD -13
0x6 -6 0xE -14
0x7 -7 0xF -15

0x2B/0x2D

7 DV1M/DV2M

5

DV1G

4

3

2

DV1/DV2

1

0

84

Stereo Audio CODEC

with FlexSound Technology

DAC Input Mixers

The IC’s stereo DAC accepts input from two digital audio paths. The DAC mixer routes any audio path to the left and
right DACs (Figure 23).

DV1G:
0/6/12/18dB

+

MULTIBAND ALC

MAX9888

DVEQ1:
0dB TO -15dB

5-BAND

PARAMETRIC

EQ

EQ1EN EQ2EN

EXCURSION LIMITER

PARAMETRIC

DVEQ2:
0dB TO -15dB

5-BAND

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

AUDIO/

FILTERS

DCB2

AUDIO/

VOICE

FILTERS

MODE1
DVFLT

MIXDAL

MIX

MIXDAR

MIX

Figure 23. DAC Input Mixer Block Diagram

Table 18. DAC Input Mixer Register

REGISTER BIT NAME DESCRIPTION

0x21

7

6

5

MIXDAL

4

3

2

1

MIXDAR

0

Left DAC Input Mixer

1xxx = DAI1 left channel
x1xx = DAI1 right channel
xx1x = DAI2 left channel
xxx1 = DAI2 right channel

Right DAC Input Mixer

1xxx = DAI1 left channel
x1xx = DAI1 right channel
xx1x = DAI2 left channel
xxx1 = DAI2 right channel

DACL

DALEN

DACR

DAREN

85

Stereo Audio CODEC
with FlexSound Technology

Preoutput Signal Path

The IC’s preoutput mixer stage provides mixing and level adjustment for line input signals routed to the output ampli­fiers. Figure 24 shows a block diagram of the preoutput signal path. 9dB is added between the line input amplifiers
and the output amplifiers to boost the 1V

maximum line input signal level to the 1V

P-P

maximum DAC signal level.

RMS

MAX9888

+

+

PGAINA:
+20dB TO -6dB

INADIFF

PGAINA:
+20dB TO -6dB

PGAINB:
+20dB TO -6dB

PGAINB:
+20dB TO -6dB

INBDIFF

MIX

MIXOUT1

MIX

MIXOUT2

MIX

MIXOUT3

PGAOUT1:
0dB TO -23d B

PGAOUT2:
0dB TO -23d B

PGAOUT3:
0dB TO -23d B

PREOUT1

PREOUT2

PREOUT3

+9dB

+9dB

+9dB

MIX

MIXREC

MIX

MIXSPL

MIX

MIXSPR

RECVOL:
+8dB TO -62dB

SPVOLL:
+8dB TO -62dB

SPVOLR:
+8dB TO -62dB

MIX

MIXHPL

MIX

MIXHPR

0dB

RECEN

BATTERY ADC

+6dB

SPLEN

DISTORTION LIMITER

+6dB

SPREN

HPVOLL:
+3dB TO -67dB

HPLEN

HPVOLR:
+3dB TO -67dB

HPREN

RECBYP

SPKBYP

POWER/

RECP/
RXINP

RECN/
RXINN

SPKLVDD

SPKLP

SPKLN

SPKLGND

SPKRVDD

SPKRP

SPKRN

SPKRPGND

HPL

HPSNS

HPR

Figure 24. Preoutput Signal Path Block Diagram

Preoutput Mixer

The IC’s output amplifiers each accept input from one of the three preoutput mixers. Configure each pre­output mixer to mix any combination of the four line input signals.

Table 19. Preoutput Mixer Registers

REGISTER BIT NAME DESCRIPTION

0x24/0x25/

0x26

86

3

2

1

MIXOUT1/
MIXOUT2/

MIXOUT3

0

Preoutput Mixer 1

1xxx = INA1
x1xx = INA2 (INADIFF = 0) or INA2 - INA1 (INADIFF = 1)
xx1x = INB1
xxx1 = INB2 (INBDIFF = 0) or INB2 - INB1 (INBDIFF = 1)

Stereo Audio CODEC

with FlexSound Technology

Preoutput PGA

The IC’s preoutput PGAs allow line input signals to be attenuated to match DAC output signal levels. Use the 0dB
setting for maximum performance.

Table 20. Preoutput PGA Registers

REGISTER BIT NAME DESCRIPTION

3

2

0x35/0x36/

0x37

1

0

PGAOUT1/
PGAOUT2/

PGAOUT3

The IC includes a single differential receiver amplifier. The receiver amplifier is designed to drive 32I receivers. In
cases where a single transducer is used for the loudspeaker and receiver, use the SPKBYP switch to route the receiver
amplifier output to the left speaker outputs.

Preoutput PGA Level

VALUE GAIN (dB) VALUE GAIN (dB)

0x0 0 0x8 -15
0x1 -1 0x9 -17
0x2 -3 0xA -19
0x3 -5 0xB -21

0x4 -7 0xC -23
0x5 -9 0xD Mute
0x6 -11 0xE Mute
0x7 -13 0xF Mute

Receiver Amplifier

MAX9888

DACL

DALEN

DACR

DAREN

PGAOUT1:
0dB TO -23dB

PREOUT1

PGAOUT2:
0dB TO -23dB

PREOUT2

Figure 25. Receiver Amplifier Block Diagram

+9dB

+9dB

MIX

MIXREC

RECVOL:
+8dB TO -62dB

0dB

RECEN

RECP/
RXINP

RECN/
RXINN

RECBYP

SPKBYP

87

Stereo Audio CODEC
with FlexSound Technology

Receiver Output Mixer

The IC’s receiver amplifier accepts input from the stereo DAC and the line inputs. Configure the mixer to mix any combina­tion of the available sources. When more than one signal is selected, the mixed signal is attenuated by 6dB for 2 signals,

9.5dB for 3 signals, or 12dB for 4 signals.

Table 21. Receiver Output Mixer Register

REGISTER BIT NAME DESCRIPTION

MAX9888

0x28

3

2

1

0

MIXREC

Receiver Output Volume

Table 22. Receiver Output Level Register

REGISTER BIT NAME DESCRIPTION

7 RECM

4

3

0x3A

2

RECVOL

1

0

Receiver Output Mixer

1xxx = Left DAC
x1xx = Right DAC
xx1x = Preoutput mixer 1
xxx1 = Preoutput mixer 2

Receiver Output Mute

0 = Disabled
1 = Enabled

Receiver Output Volume Level

VALUE VOLUME (dB) VALUE VOLUME (dB)

0x00 -62 0x10 -10

0x01 -58 0x11 -8

0x02 -54 0x12 -6

0x03 -50 0x13 -4

0x04 -46 0x14 -2

0x05 -42 0x15 0

0x06 -38 0x16 +1

0x07 -35 0x17 +2

0x08 -32 0x18 +3

0x09 -29 0x19 +4

0x0A -26 0x1A +5

0x0B -23 0x1B +6
0x0C -20 0x1C +6.5
0x0D -17 0x1D +7

0x0E -14 0x1E +7.5

0x0F -12 0x1F +8

88

with FlexSound Technology

Speaker Amplifiers

The IC integrates a stereo filterless Class D amplifier that
offers much higher efficiency than Class AB without the
typical disadvantages.

The high efficiency of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as current
steering switches and consume negligible additional
power. Any power loss associated with the Class D out­put stage is mostly due to the I
on-resistance, and quiescent current overhead.

2

R loss of the MOSFET

Stereo Audio CODEC

MAX9888

The theoretical best efficiency of a linear amplifier is
78%, however, that efficiency is only exhibited at peak
output power. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the IC’s Class D amplifier still exhibits 80% effi­ciency under the same conditions.

Traditional Class D amplifiers require the use of exter­nal LC filters or shielding to meet EN55022B and FCC
electromagnetic-interference (EMI) regulation standards.
Maxim’s patented active emissions limiting edge-rate
control circuitry reduces EMI emissions (Figure 26).

40

30

20

10

AMPLITUDE (dBµV/m)

0

-10
30 60 80 100 120 140 160 180 200 220 240 260 280 300

FREQUENCY (MHz)

Figure 26. EMI with 15cm of Speaker Cable

DACL

DALEN

DACR

DAREN

MIX

MIXSPL

MIX

MIXSPR

40

30

20

10

AMPLITUDE (dBµV/m)

0

-10
300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000

BATTERY ADC

SPVOLL:
+8dB TO -62dB

+6dB

SPLEN

POWER/DISTORTION LIMITER

+6dB

SPVOLR:
+8dB TO -62dB

SPREN

FREQUENCY (MHz)

SPKLVDD

SPKLP

SPKLN

SPKLGND

SPKRVDD

SPKRP

SPKRN

SPKRPGND

PGAOUT2:
0dB TO -23dB

PREOUT2

+9dB

PGAOUT3:
0dB TO -23dB

PREOUT3

+9dB

Figure 27. Speaker Amplifier Path Block Diagram

89

Stereo Audio CODEC
with FlexSound Technology

Speaker Output Mixers

The IC’s speaker amplifiers accept input from the stereo DAC and the line inputs. Configure the mixer to mix any combina­tion of the available sources. When more than one signal is selected, the mixed signal is attenuated by 6dB for 2 signals,

9.5dB for 3 signals, or 12dB for four signals.

Table 23. Speaker Output Mixer Register

REGISTER BIT NAME DESCRIPTION

MAX9888

0x29

7

6

5

4

3

2

1

0

MIXSPL

MIXSPR

Speaker Output Volume

Table 24. Speaker Output Mixer Register

REGISTER BIT NAME DESCRIPTION

7 SPLM/SPRM

4

3

0x3B/0x3C

2

SPVOLL/SPVOLR

1

0

Left Speaker Output Mixer

1xxx = Left DAC
x1xx = Right DAC
xx1x = Reserved
xxx1 = Preoutput mixer 3

Right Speaker Output Mixer

1xxx = Left DAC
x1xx = Right DAC
xx1x = Reserved
xxx1 = Preoutput mixer 2

Left/Right Speaker Output Mute

0 = Disabled
1 = Enabled

Left/Right Speaker Output Volume Level

VALUE VOLUME (dB) VALUE VOLUME (dB)

0x00 -64 0x10 -10
0x01 -59 0x11 -8
0x02 -55 0x12 -6
0x03 -50 0x13 -4
0x04 -46 0x14 -2
0x05 -42 0x15 0
0x06 -38 0x16 +1
0x07 -35 0x17 +2
0x08 -32 0x18 +3

0x09 -29 0x19 +4
0x0A -26 0x1A +5
0x0B -23 0x1B +6
0x0C -20 0x1C +6.5
0x0D -17 0x1D +7

0x0E -14 0x1E +7.5

0x0F -12 0x1F +8

90

with FlexSound Technology

Speaker Amplifier Signal Processing

The IC includes signal processing to improve the sound
quality of the speaker output and protect transducers
from damage. An excursion limiter dynamically adjusts
the highpass corner frequency, while a power limiter and
distortion limiter prevent the amplifier from outputting too
much distortion or power. The excursion limiter is located
in the DSP while the distortion limiter and power limiter
control the analog volume control (Figure 28). All three
limiters analyze the speaker amplifier’s output signal to
determine when to take action.

Excursion Limiter

The excursion limiter is a dynamic highpass filter that
monitors the speaker outputs and increases the high­pass corner frequency when the speaker amplifier’s out­put exceeds a predefined threshold. The filter smoothly
transitions between the high and low corner frequency to
prevent unwanted artifacts. The filter can operate in four
different modes:

Fixed Frequency Preset Mode. The highpass corner

U

frequency is fixed at the upper corner frequency and
does not change with signal level.

Fixed Frequency Programmable Mode. The high-

U

pass corner frequency is fixed to that specified by the
programmable biquad filter.

Stereo Audio CODEC

Preset Dynamic Mode. The highpass filter automati-

U

cally slides between a preset upper and lower corner
frequency based on output signal level.

User Programmable Dynamic Mode. The highpass

U

filter slides between a user-programmed biquad filter
on the low side to a predefined corner frequency on
the high side.

The transfer function for the user-programmable biquad is:

b b z b z

H(z)

0 1 2

=

1 a z a z

The coefficients b0, b1, b2, a1, and a2 are sample rate
dependent and stored in registers 0xB4 through 0xC7.
Store b
a

2

, b1, and b2 as positive numbers. Store a1 and

0

as negated two’s complement numbers. Separate fil-

ters can be stored for the DAI1 and DAI2 playback paths.

The MAX9888 EV kit software includes a graphic interface
for generating the user-programmable biquad coefficients.

Note: Only change the excursion limiter settings when
the signal path is disabled to prevent undesired artifacts.

-1 -2

+ +

-1 -2

+ +

1 2

MAX9888

DV1G:
0/6/12/18dB

+

MULTIBAND ALC

DVEQ1:
0dB TO -15dB

5-BAND

PARAMETRIC

EQ

EQ1EN EQ2EN

EXCURSION LIMITER

Figure 28. Speaker Amplifier Signal Processing Block Diagram

5-BAND

PARAMETRIC

EQ

DV2:
0dB TO -15dB

DV1:
0dB TO -15dB

DVEQ2:
0dB TO -15dB

DCB2

MODE1
DVFLT

AUDIO/

FILTERS

AUDIO/

VOICE

FILTERS

MIX

MIXDAL

MIX

MIXDAR

DALEN

DAREN

DACL

DACR

MIX

MIXSPL

MIX

MIXSPR

SPVOLL:
+8dB TO -62dB

SPVOLR:
+8dB TO -62dB

BATTERY ADC

+6dB

SPLEN

DISTORTION LIMITER

+6dB

SPREN

POWER/

SPKLVDD

SPKLP

SPKLN

SPKLGND

SPKRVDD

SPKRP

SPKRN

SPKRPGND

91

Stereo Audio CODEC
with FlexSound Technology

Table 25. Excursion Limiter Registers

REGISTER BIT NAME DESCRIPTION

Excursion Limiter Corner Frequency

6

5

MAX9888

4

0x3F

1

0

6

0x41

0x40

92

5

4

3

2

1

0

DHPUCF

DHPLCF

ALCRLS

DHPTH

The excursion limiter has limited sliding range and minimum corner frequencies. Listed below
are all the valid filter combinations.

LOWER CORNER

FREQUENCY

Excursion limiter disabled — 000 00

Programmable using biquad 100Hz 000 11
200Hz 400Hz — 001 01
400Hz 600Hz — 010 10
400Hz 800Hz — 011 10

Programmable

using biquad

Programmable

using biquad

Programmable

using biquad

Programmable

using biquad

ALC and Excursion Limiter Release Time

Sets the release time for both the ALC and Excursion Limiter. See the Automatic Level Control
section for ALC release times. Excursion limiter release time is defined as the time required to
slide from the high corner frequency to the low corner frequency.

Excursion Limiter Threshold

Measured at the Class D speaker amplifier outputs. Signals above the threshold use the upper
corner frequency. Signals below the threshold use the lower corner frequency. V

correctly reflect the voltage of SPKLVDD to achieve accurate thresholds.

000 = 0.34V
001 = 0.71V
010 = 1.30V
011 = 1.77V
100 = 2.33V
101 = 3.25V
110 = 4.25V
111 = 4.95V

P
P
P
P
P
P
P
P

UPPER CORNER

FREQUENCY

400Hz — 001 00
600Hz — 010 00
800Hz — 011 00

1kHz — 100 00

400Hz 200Hz 001 11

600Hz 300Hz 010 11

800Hz 400Hz 011 11

1kHz 500Hz 100 11

VALUE EXCURSION LIMITER RELEASE TIME (s)

000 4
001 2
010 1
011 0.5
100 0.25
101 0.25
110 Reserved
111 Reserved

MINIMUM BIQUAD

CORNER FREQUENCY

DHPUCF DHPLCF

must

BAT

Stereo Audio CODEC

with FlexSound Technology

Power Limiter

The IC’s power limiter tracks the RMS power delivered to
the loudspeaker and briefly mutes the speaker amplifier
output if the speaker is at risk of sustaining permanent
damage.

Loudspeakers are typically damaged when the voice coil
overheats due to extended operation above the rated
power. During normal operation, heat generated in the
voice coil is transferred to the speaker’s magnet, which
transfers heat to the surrounding air. For the voice coil to
overheat, both the voice coil and the magnet must over­heat. The result is that a loudspeaker can operate above
its rated power for a significant time before it heats suf­ficiently to cause damage.

Table 26. Power Limiter Registers

REGISTER BIT NAME DESCRIPTION

Power Limiter Threshold

If the RMS output power from the speaker amplifiers exceeds this threshold, the out-

7

6

PWRTH

5

0x42

REGISTER BIT NAME DESCRIPTION

4

2

1

0

PWRK

put is briefly muted to protect the speaker. The threshold is measured in watts assum­ing an 8I load. VBAT must correctly reflect the voltage of SPKLVDD/SPKRVDD to

achieve accurate thresholds.

VALUE

0x0

0x1 0.05 0x9 0.35
0x2 0.06 0xA 0.48
0x3 0.09 0xB 0.72
0x4 0.11 0xC 1.00
0x5 0.13 0xD 1.43
0x6 0.18 0xE 1.57
0x7 0.22 0xF 1.80

Power Limiter Weighting Factor

Determines the balance between time constant 1 and 2 to match the dominance of
each time constant in the loudspeaker.

VALUE T1 (%) T2 (%)

000 50 50
001 62.5 37.5
010 75 25
011 87.5 12.5
100 100 0
101 12.5 87.5
110 25 75
111 37.5 62.5

The IC’s power limiter includes user-programmable time
constants and power thresholds to match a wide range
of loudspeakers. Program the power limiter’s threshold to
match the loudspeaker’s rated power handling. This can
be determined through measurement or the loudspeak­er’s specification. Program time constant 1 to match the
voice coil’s thermal time constant. Program time constant
2 to match the magnet’s thermal time constant. The time
constants can be determined by plotting the voice coil’s
resistance vs. time as power is applied to the speaker.

THRESHOLD

(W)

Power limiter

disabled

VALUE

0x8 0.27

THRESHOLD

MAX9888

(W)

93

Stereo Audio CODEC
with FlexSound Technology

Table 26. Power Limiter Registers (continued)

7

6

MAX9888

5

4

0x43

3

2

1

0

PWRT2

PWRT1

Power Limiter Time Constant 2

Select a value that matches the thermal time constant of the loudspeaker’s magnet.

VALUE

0x0 Disabled 0x8 3.75
0x1 0.50 0x9 5.00
0x2 0.67 0xA 6.66
0x3 0.89 0xB 8.88

0x4 1.19 0xC Reserved
0x5 1.58 0xD Reserved
0x6 2.11 0xE Reserved
0x7 2.81 0xF Reserved

Power Limiter Time Constant 1

Select a value that matches the thermal time constant of the loudspeaker’s voice coil.

VALUE

0x0 Disabled 0x8 3.75
0x1 0.50 0x9 5.00
0x2 0.67 0xA 6.66
0x3 0.89 0xB 8.88
0x4 1.19 0xC Reserved
0x5 1.58 0xD Reserved
0x6 2.11 0xE Reserved
0x7 2.81 0xF Reserved

TIME CONSTANT

(min)

TIME CONSTANT

(s)

VALUE

VALUE

TIME CONSTANT

(min)

TIME CONSTANT

(s)

Distortion Limiter

The IC’s distortion limiter ensures that the speaker amplifier’s output does not exceed the programmed THD+N limit.
The distortion limiter analyzes the Class D output duty cycle to determine the percentage of the waveform that is
clipped. If the distortion exceeds the programmed threshold, the output gain is reduced.

94

Stereo Audio CODEC

with FlexSound Technology

Table 27. Distortion Limiter Registers

REGISTER BIT NAME DESCRIPTION

Distortion Limit

Measured in % THD+N.

VALUE THD+N LIMIT (%) VALUE THD+N LIMIT (%)

0x0 Limiter disabled 0x8 12

0x1 < 1 0x9 14

0x2 1 0xA 16

0x3 2 0xB 18

0x4 4 0xC 20

0x5 6 0xD 21

0x6 8 0xE 22

0x7 10 0xF 24

Distortion Limiter Release Time Constant

Duration of time required for the speaker amplifier’s output gain to adjust back to the
nominal level after a large signal has passed.
000 = 6.2s
001 = 3.1s
010 = 1.6s
011 = 815ms
100 = 419ms
101 = 223ms
110 = 116ms
111 = 76ms

0x44

7

6

5

4

2

1

0

THDCLP

THDT1

MAX9888

Headphone Amplifier

The IC’s headphone amplifier integrates Maxim’s
DirectDrive architecture to eliminate the need for large
DC-blocking capacitors. Traditional single-supply head­phone amplifiers have outputs biased at a nominal
DC voltage (typically half the supply). Large coupling
capacitors are needed to block this DC bias from the
headphone. Without these capacitors, a significant
amount of DC current flows to the headphone, resulting
in unnecessary power dissipation and possible damage
to both the headphone and headphone amplifier.

The DirectDrive architecture uses a charge pump to
create an internal negative supply voltage. This allows
the IC’s headphone outputs to be biased at GND while
operating from a single supply (Figure 29). Without a DC
component, there is no need for the large DC-blocking
capacitors. Instead of two large (220FF, typ) capaci­tors, the IC charge pump requires two small ceramic
capacitors, conserving board space, reducing cost, and

improving the frequency response of the headphone
amplifier. There is a low DC voltage on the amplifier out­puts due to amplifier offset. However, the offset of the IC
is typically Q0.2mV, which, when combined with a 32I
load, results in less than 6FA of DC current flow to the
headphones.

In addition to the cost and size disadvantages of
the DC-blocking capacitors required by conventional
headphone amplifiers, these capacitors limit the ampli­fier’s low-frequency response and can distort the audio
signal. The DC-blocking capacitor not only blocks DC,
but also low-frequency audio. Improving the low-fre­quency response of a conventional headphone amplifier
requires increasing the capacitor size, further adding
to the cost and size of the solution. Due to the voltage
coefficient of the capacitors used for DC blocking, they
introduce significant distortion near the corner frequency
of the highpass filter they create. This distortion further
degrades the low-frequency audio quality.

95

Stereo Audio CODEC
with FlexSound Technology

Alternative approaches to eliminating the output-cou­pling capacitors involve biasing the headphone return
(sleeve) to the DC bias voltage of the headphone ampli­fiers. This method raises some issues:

U The sleeve is typically grounded to the chassis. Using

the midrail biasing approach, the sleeve must be
isolated from system ground, complicating product
design.

MAX9888

U During an ESD strike, the amplifier’s ESD structures

are the only path to system ground. Thus, the ampli­fier must be able to withstand the full energy from an
ESD strike.

U When using the headphone jack as a line out to other

equipment, the bias voltage on the sleeve may con­flict with the ground potential from other equipment,
resulting in possible damage to the amplifiers.

The IC features a low-noise charge pump to generate
a negative supply for the headphone amplifier. The
nominal switching frequency is well beyond the audio
range, and thus does not interfere with audio signals.

The switch drivers feature a controlled switching speed
that minimizes noise generated by turn-on and turn-off
transients. By limiting the switching speed of the charge
pump, the di/dt noise caused by the parasitic trace
inductance is minimized. The charge pump is active only
in headphone modes.

To reduce audible noise at the outputs, the IC’s head­phone amplifier includes headphone ground sensing.
Connect the sense line (HPSNS) to the ground terminal
of the device’s headphone jack. Any noise present at
the headphone ground is then added to the headphone
output. The result is elimination of this noise from the
audible output. If ground sensing is not required, con­nect HPSNS directly to ground. Figure 30 shows a block
diagram of the headphone output section including the
headphone sense function.

Headphone Output Mixers

The IC’s headphone amplifier accepts input from the
stereo DAC and the line inputs. The output of the left and
right DAC cannot be mixed at the headphone mixer. Use
MIXDAL/MIXDAR to mix the left and right audio channels
before conversion.

V

DD

VDD/2

GND

CONVENTIONAL AMPLIFIER BIASING SCHEME

+V

DD

GND

-V

DD

DirectDrive AMPLIFIER BIASING SCHEME

Figure 29. Traditional Amplifier Output vs. DirectDrive Output

96

(VSS)

DACL

DALEN

DACR

DAREN

PGAOUT1:
0dB TO -23dB

PREOUT1

+9dB

PREOUT2

+9dB

PGAOUT2:
0dB TO -23dB

Figure 30. Headphone Amplifier Block Diagram

MIX

MIXHPL

MIX

MIXHPR

HPVOLL:
+3dB TO -67dB

HPL

HPLEN

HPSNS

HPVOLR:
+3dB TO -67dB

HPR

HPREN

Stereo Audio CODEC

with FlexSound Technology

Table 28. Headphone Output Mixer Register

REGISTER BIT NAME DESCRIPTION

7

6

5

4

0x27

3

2

1

0

MIXHPL

MIXHPR

Headphone Output Volume

Table 29. Headphone Output Level Register

REGISTER BIT NAME DESCRIPTION

7 HPLM/HPRM

4

0x38/0x39

3

HPVOLL/HPVOLR

2

1

0

Left Headphone Output Mixer

10xx = Left DAC
01xx = Right DAC (requires DALEN = 0 for proper operation)
11xx = Left DAC
xx1x = Reserved
xxx1 = Preoutput mixer 1

Right Headphone Output Mixer

10xx = Left DAC (requires DAREN = 0 for proper operation)
01xx = Right DAC
11xx = Right DAC
xx1x = Reserved
xxx1 = Preoutput mixer 2

Headphone Output Mute

0 = Disabled
1 = Enabled

Left/Right Headphone Output Volume Level

VALUE VOLUME (dB) VALUE VOLUME (dB)

0x00 -67 0x10 -15
0x01 -63 0x11 -13
0x02 -59 0x12 -11
0x03 -55 0x13 -9
0x04 -51 0x14 -7
0x05 -47 0x15 -5
0x06 -43 0x16 -4
0x07 -40 0x17 -3
0x08 -37 0x18 -2
0x09 -34 0x19 -1
0x0A -31 0x1A 0
0x0B -28 0x1B +1
0x0C -25 0x1C +1.5
0x0D -22 0x1D +2
0x0E -19 0x1E +2.5
0x0F -17 0x1F +3

MAX9888

97

Stereo Audio CODEC
with FlexSound Technology

Output Bypass Switches

The IC includes two output bypass switches that solve
common applications problems. When a single trans­ducer is used for the loudspeaker and receiver, the need
exists for two amplifiers to power the same transducer.
Bypass switches connect the IC’s receiver amplifier
output to the speaker amplifier’s output, allowing either
amplifier to power the same transducer. In systems where

MAX9888

SPKLP

SPKLN

10I*

10I*

EXTERNAL

RECEIVER

AMP

0dB

RECEN

+6dB

SPLEN

POWER/DISTORTION

SPEAKER AMPLIFIER BYPASS USING THE

RECP/RXINP

0dB

RECEN

RECBYP

SPKBYP

+6dB

SPLEN

POWER/DISTORTION

LIMITER

*OPTIONAL 10I RESISTORS IMPROVE DISTORTION
THROUGH THE ANALOG SWITCH.

SPEAKER AMPLIFIER BYPASS USING AN

RECN/RXINN

SPKLVDD

SPKLGND

EXTERNAL RECEIVER AMPLIFIER

an external receiver amplifier is used, route its output to
the left speaker through RECP/RXINP and RECN/RXINN,
bypassing the Class D amplifier. In systems where an
external amplifier drives both the receiver and the IC’s
line input, one of the differential signals can be discon­nected from the receiver when not needed by passing it
through the analog switch that connects RECP/RXINP to
RECN/RXINN.

RECP/RXINP

RECN/RXINN

RECBYP

SPKBYP

SPKLVDD

SPKLP

SPKLN

SPKLGND

LIMITER

INTERNAL RECEIVER AMPLIFIER

0dB

RECEN

RECBYP

SPKBYP

+6dB

SPLEN

POWER/DISTORTION

LIMITER

CONTROLLING AN EXTERNAL RECEIVE

AMPLIFIER AND SPEAKER

EXTERNAL

RECEIVER AMP

RECN/RXINN

RECN/RXINN

SPKLVDD

SPKLP

SPKLN

SPKLGND

Figure 31. Output Bypass Switch Block Diagrams

Table 30. Output Bypass Switches Register

REGISTER BIT NAME DESCRIPTION

7 INABYP
4 MIC2BYP

1 RECBYP

0x48

0 SPKBYP

98

See the Microphone Inputs section.

RXINP to RXINN Bypass Switch

Shorts RXINP to RXINN allowing a signal to pass through the MAX9888. Disable the
receiver amplifier when RECBYP = 1.
0 = Disabled
1 = Enabled

RXIN to SPKL Bypass Switch

Shorts RXINP/RXINN to SPKLP/SPKLN allowing either the internal or an external
receiver amplifier to power the left speaker. Disable the left speaker amplifier when
SPKBYP = 1.
0 = Disabled
1 = Enabled

Stereo Audio CODEC

with FlexSound Technology

Click-and-Pop Reduction

The IC includes extensive click-and-pop reduction cir­cuitry. The circuitry minimizes clicks and pops at turn-on,
turn-off, and during volume changes.

Zero-crossing detection is implemented on all analog
PGAs and volume controls to prevent large glitches
when volume changes are made. Instead of making a
volume change immediately, the change is made when
the audio signal crosses the midpoint. If no zero-crossing
occurs within the timeout window, the change is forced.

Volume slewing breaks up large volume changes into the
smallest available step size and the steps through each
step between the initial and final volume setting. When

Table 31. Click-and-Pop Reduction Register

REGISTER BIT NAME DESCRIPTION

Enhanced Volume Smoothing

During volume slewing, the controller waits for each step in the ramp to be applied
before sending the next step. When zero-crossing detection is enabled this prevents

7 VS2EN

6 VSEN

0x49

5 ZDEN

1 EQ2EN
0 EQ1EN

large steps in the output volume when no zero crossings are detected.
0 = Enabled
1 = Disabled
Applies to volume changes in HPVOLL, HPVOLR, RECVOL, SPVOLL, and SPVOLR.

Volume Adjustment Smoothing

Volume changes are smoothed by stepping through intermediate steps. Also ramps
the volume from minimum to the programmed value at turn-on and back to minimum at
turn-off.
0 = Enabled
1 = Disabled
Applies to volume changes in HPVOLL, HPVOLR, RECVOL, SPVOLL, and SPVOLR.

Zero-Crossing Detection

Holds volume changes until there is a zero crossing in the audio signal. This reduces
click and pop during volume changes (zipper noise). If no zero crossing is detected
within 100ms, the volume change is forced.
0 = Enabled
1 = Disabled
Applies to volume changes in PGAM1, PGAM2, PGAOUTA, PGAOUTB, PGAOUTC,
HPVOLL, HPVOLR, RECVOL, SPVOLL, and SPVOLR.

See the 5-Band Parametric EQ section.

enabled, volume slewing also occurs at device turn-on
and turn-off. During turn-on the volume is set to mute
before the output is enabled. Once the output is on, the
volume ramps to the desired level. At turn-off the volume
is ramped to mute before the outputs are disabled.

When there is no audio signal zero-crossing detection
can prevent volume slewing from occurring. Enable
enhanced volume slewing to prevent the volume control­ler from requesting another volume level until the previ­ous one has been set. Each step in the volume ramp
then occurs after a zero crossing has occurred in the
audio signal or the timeout window has expired. During
turn-off, enhance volume slewing is always disabled.

MAX9888

99

Stereo Audio CODEC
with FlexSound Technology

Jack Detection

The IC features jack detection that can detect the inser­tion and removal of a jack as well as the load type. When
a jack is detected, an interrupt on IRQ can be triggered
to alert the microcontroller of the event. Figure 32 shows
the typical configuration for jack detection.

Jack Insertion

To detect a jack insertion, the IC must have a power

MAX9888

supply and MICBIAS should be disabled. Set JDETEN
to enable jack detection circuitry and apply a pullup cur­rent to JACKSNS. Set JDWK to minimize supply current.
Clear JDWK to differentiate between headsets with a
microphone and headphones without a microphone. The
voltage on JACKSNS is equal to SPKLVDD as long as no

Figure 32. Typical Configuration for Jack Detection

load is applied to JACKSNS. Table 32 shows the change
in JKSNS that occurs when a jack is inserted.

Accessory Button Detection

After jack insertion, the MAX9888 can detect button
presses on accessories that include a microphone and
a switch that shorts the microphone signal to ground.
Set JDETEN to enable jack detection circuitry. A pullup
current is automatically applied to JACKSNS if MICBIAS
is disabled. Clear JDWK to allow differentiation between
the microphone load and a short to ground. Button
presses can be detected both when MICBIAS is enabled
and disabled. Table 33 shows the change in JKSNS that
occurs when the accessory button is pressed.

HPL

HPR

MICBIAS

JACKSNS

MIC1P

Table 32. Change in JKSNS Upon Jack Insertion

JACK TYPE JDWK = 1 JDWK = 0

GND GND R L

MIC GND R L

JKSNS: 11 è 00 JKSNS: 11 è 00

JKSNS: 11 è 00 JKSNS: 11 è 01

Table 33. Change in JKSNS Upon Button Press

JACK TYPE MICBIAS ENABLED OR DISABLED

MIC GND R L

JKSNS: 01 è 00

100