ANALOG DEVICES AD1988B Service Manual

High Definition Audio SoundMAX® Codec

AD1988A/AD1988B

FEATURES

Ten 192 kHz DACs

Five independent stereo DAC pairs

7.1 surround sound plus independent headphone Independent 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz sample rates

Selectable stereo mixer on outputs 16-, 20-, and 24-bit PCM resolution

Six 192 kHz ADCs

Three independent stereo ADC pairs Simultaneous record of up to three stereo channels

Support for quad microphone arrays plus independent capture channel

Independent 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz sample rates

16-, 20-, and 24-bit resolution S/PDIF output

44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz sample rates

16-, 20-, and 24-bit data widths

PCM, WMA/PRO, Dolby®, AC3, and DTS® formats Digital PCM gain control

Digital PCM ADC/stream mixer S/PDIF input

44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz sample rates

16-, 20-, and 24-bit data widths

PCM, WMA/PRO, Dolby, AC3, and DTS formats Digital PCM gain control

Auto synchronizes to source

High quality stereo CD input with GND sense MONO_OUT pin for internal speakers or telephony Retasking jack support

ENHANCED FEATURES

Three stereo headphone amps

AD1988A: Windows Vista™ Operating System Premium Logo compliant

95 dB outputs

90 dB audio inputs

AD1988B: Windows Vista Premium Logo compliant and Dolby Master Studio™ compliant

101 dB outputs

92 dB audio inputs

Internal 32-bit arithmetic for greater accuracy Impedance and presence detection on all jacks Analog PCBEEP and digital synthesis BEEP C/LFE channel swap

Two general-purpose digital I/O (GPIO) pins 3.3 V analog and digital supplies

Reduced support components Advanced power management modes

48-pin LQFP and LFCSP_VQ package options, Pb-free Supports Andrea Active Noise Reduction headphones Hardware volume control

Built-in microphone gain amps Adjustable microphone bias pins

Rev. 0

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AD1988A/AD1988B

TABLE OF CONTENTS

Features ..............................................................................................	1	Pin Configuration and Function Descriptions	..............................8
Enhanced Features............................................................................	1	Clarification of Output Configurations ..................................	11
Revision History ...............................................................................	2	HD Audio Widgets.........................................................................	12
Functional Block Diagram ..............................................................	3	Jack Presence Detection.................................................................	18
Specifications.....................................................................................	4	HD Audio Style Jack Presence Detection ...............................	18
Test Conditions.............................................................................	4	Hardware Volume Control............................................................	19
Absolute Maximum Ratings............................................................	7	Outline Dimensions .......................................................................	20
Thermal Resistance ......................................................................	7	Ordering Guide ..........................................................................	20
ESD Caution..................................................................................	7

REVISION HISTORY

10/06—Revision 0: Initial Version

Rev. 0 | Page 2 of 20

AD1988A/AD1988B

FUNCTIONAL BLOCK DIAGRAM

NID: 0 7

NID: 1 C

AVSS

24 bit

Digital

+3.3V +/-5%

AVDD

32-192 kHz

S/PDIF I n / GPIO_1

PCM / D igital

GAM

S/PDIF R X

Input_En

Z

GPIO_1

MIC Bias Regulator

MIC_BIAS_FILT

Stereo Paths

NID: 3 5

-34 .5 to +12 dB

N ID : 1 D

N ID : 0 2

Mono Paths

0 (01 )

M

24 bit

NID: 1 B

VREF

VREF_FILT

Σ

32-192 kHz

Digital

Z

S/PDIF Out

PCM / D igital

AM

NID: 2 3

101+ dB (AD1988B)

1 (0 B )

M

S/PDIF T X

Output_En

-58 .5 to 0 dB

24 bit

DAC _4

N ID : 0A

192 kHz

Di g ita l

0 (0 A )

M

N ID : 2 8

PCM

A

N ID : 2 5

Σ∆ DAC

Σ

M

Z

PORT-H

-58 .5 to 0 dB

1 (21 )

M

Split-Z

Surround

EN

Center

DAC _ 3

N ID : 1 6

24 bit

N ID : 0 6

BIAS

Z

PORT-F

MIC BIAS

192 kHz

Di g ita l

0 (06 )

M

NID: 2 A

PCM

A

Σ∆ DAC

Σ

M

Z

PORT-F

-58 .5 to 0 dB

Surround

1 (21 )

M

Back

Boost

EN

DAC _ 2

NID: 3B

24 bit

NID: 0 5

192 kHz

Di g ita l

0 (05 )

M

N ID :2 7

PCM

A

N ID : 2 4

Σ∆ DAC

Σ

M

Z

S WA P

PORT-G

-58 .5 to 0 dB

1 (21 )

M

Center / LFE

EN

BIAS /

N ID : 1 2 PORT-D

DAC _ 1

Z

MIC BIAS /

24 bit

EAPD

H

N ID : 0 4

EAPD

192 kHz

Di g ita l

0 (04 )

M

N ID : 2 9

PCM

A

D

Σ∆ DAC

Σ

M

HP

Z

PORT-D

-58 .5 to 0 dB

AMP

Mixer

1 (21 )

M

HP-Front L/R

A

DAC _ 0

Power

Control

24 bit

N ID : 0 3

Boost

EN

U

NID: 1 9

192 kHz

Di g ita l

NID: 3D

PCM

A

D

Σ∆ DAC

N ID: 2 1

AM

N ID : 1 1

I

-58 .5 to 0 dB

BIAS

Z

PORT-A

-46 .5 to 0 dB

0 (03 )

MIC BIAS

O

1 (04 )

3:1

0 (37 )

M

N ID : 2 2

2 (06 )

HP

GPIO_1

NID: 20

Σ

M

Z

PORT-A

GPIO

5 (3 B – P or t-F)

N ID : 3 7

AMP

I

GPIO_0 /

3 (3 D – P ort-D)

1 (21 )

M

Headphone

Volume

SDI

N

-34.5 to +12dB

Boost

EN

SDO

T

HW

2 (38 – P ort-A)

NID: 38

Volume

GAM

GAM

GAM

0 (03 )

SYNC

E

Control

1 (04 )

0 (36 )

NID: 1 E

NID: 1 F

3:1

M

N ID : 2 D

N ID: 1 3

RESET#

2 (06 )

R

N ID : 3 3

Σ

Σ

A

M

MONO_OUT

2 (24 )

BITCLK

1 (33 – P ort-C/H/G)

1 (25 )

N ID : 3 6

F

5

3

GAM

1 (21 )

S te re o

-46 .5 to 0 dB

3:1

M

D own-M ix

0 (3 A )

2

A

Σ

1

N ID : 1 4

4

N ID : 3 4

N ID : 3 0

BIAS

Z

PORT-B

C

0

2 (24 )

0 (03 )

MIC BIAS

4 (34 – P ort-E /H /G)

1 (25 )

6

7

GAM

1 (04 )

E

3:1

3:1

0 (30 )

M

NID: 2 B

0 (3 C )

2 (06 )

Σ

M

HP

Z

PORT-B

AMP

GAM

GAM

1 (21 )

M

Microphone

7

0 (39 – P ort-B )

Boost

(1 6

- A(1

GAM

EN

NID: 39

N ID : 0 B

8

P

C -

CB

Selector

)D

ee

3:1

p)

N ID : 1 7

2

1

0

BIAS

Z

PORT-E

F) (0

)9 (0

) 8 (0

ADC _ 0

ADC SE L_ 0

1 (21 )

M

N ID : 2 6

MIC BIAS

NID: 0 8

N ID : 0 C

24 bit

Digital /

Σ

M

Z

S WA P

PORT-E

192 kHz

A na log

Selector

N ID : 3 2

PCM

10 :1

0 (05 )

MIC 1/2

GM

0 (32 )

Σ∆ ADC

1 (04 )

2:1

M

-58 .5 to +22 .5 dB

Boost

EN

NID: 3C

N ID : 1 5

+1.5V +/- 10 %

BIAS /

PORT-C

Z

MIC BIAS /

(A D 1988L15 )

ADC _ 1

ADC SE L_ 1

1 (21 )

EAPD

DVIO

M

NID: 2 C

EAPD

NID: 0 9

N ID : 0 D

+3.3V +/- 10 %

24 bit

Σ

M

Z

PORT-C

(A D 1988L33 )

Digital /

192 kHz

Selector

0 (04 )

N ID : 3 1

A na log

0 (31 )

Line In

DVDD

+3.3V +/- 10 %

PCM

GM

10 :1

1 (0 A )

2:1

M

Σ∆ ADC

-58 .5 to +22 .5 dB

Boost

EN

NID: 3A

DVFILT

+1.8V

+5 %

-20 %

PCBeep

9 (20 - M ixe r)

NID: 1 A

7 (25 – P ort-H )

ADC _ 2

ADC SE L_ 2

6 (24 – P ort-G)

NID: 0 F

N ID : 0 E

3 (3 B – P ort-F)

DVSS

24 bit

8 (3 D – P ort-D)

N ID : 1 0

Digital /

Digital Beep

AM

192 kHz

Selector

A na log

0 (38 – P ort-A )

PCM

10 :1

-45 .0 t o 0 dB

GM

Σ∆ ADC

1 (39 – P ort-B )

3 dB S tep s

-58 .5 to +22 .5 dB

4 (3 C – P ort-E )

2 (3 A – P ort-C)

NID: 1 8

-011

5 (18 - CD )

C D

CD _L

D iff

CD _GND

05843

A m p

CD _R

Figure 1. Block Diagram

Rev. 0 | Page 3 of 20

AD1988A/AD1988B

SPECIFICATIONS

TEST CONDITIONS

Test Conditions for the AD1988A and AD1988B are as follows, unless otherwise noted.

Analog Input/Output Conditions

Temperature at 25°C

Digital supply (DVDD) at 3.3 V ±10% Analog supply (AVDD) at 3.3 V ±5% MIC_BIAS_FILT at 5.0 V ±5% Sample rate (FS) at 48 kHz

Input signal at 1008 Hz

Analog output pass band at 20 Hz to 20 kHz

Table 1.

DAC Conditions

Calibrated

Output −3 dB relative to full scale 10 kΩ output load: line out tests 32 Ω output load: headphone tests

ADC Conditions

Calibrated

0 db PGA gain

Input −3.0 dB relative to full scale

			Typ
			AD1988A/
Parameter	Conditions/Comments	Min	AD1988B	Max	Unit
DIGITAL DECIMATION AND INTERPOLATION FILTERS1	fS 8 kHz ~ 192 kHz
Pass Band		0		0.40 fS	Hz
Pass-Band Ripple				±0.005	dB
Stop Band		0.60 fS			Hz
Stop Band Rejection				−100	dB
Group Delay			20		1/fS
Group Delay Variation over Pass Band			0		μs
ANALOG-TO-DIGITAL CONVERTERS
Resolution1			24		Bits
Gain Error	Full-scale span relative to nominal input			±10	%
	voltage
Interchannel Gain Mismatch	Difference of gain errors		±0.2	±0.5	dB
ADC Offset Error				±5	mV
ADC Crosstalk1
Line Inputs	Input L, Ground R, Read R;		−85		dB
	Input R, Ground L, Read L
LINE_IN to Other			−100	−80	dB
DIGITAL-TO-ANALOG CONVERTERS
Resolution1			24		Bits
Gain Error	Full-scale span relative to nominal input			±10	%
	voltage
Interchannel Gain Mismatch	Difference of gain errors		±0.2	±0.5	dB
Total Out-of-Band Energy 1	To 100 kHz		−85		dB
DAC Crosstalk1	Input L, Zero R, Read R;		−95		dB
	Input R, Zero L, Read L
DAC VOLUMES—PROGRAMMABLE GAIN ATTENUATOR
Step Size	DAC_0, DAC_1, DAC_2, DAC_3, DAC_4		+1.5		dB
Output Gain/Attenuation Range		−58.5		0	dB
ADC VOLUMES—PROGRAMMABLE GAIN
AMPLIFIER/ATTENUATOR
Step Size	ADCSEL_0, ADCSEL_1, ADCSEL_2		+1.5		dB
PGA Gain/Attenuation Range		−58.5		+22.5	dB
ANALOG MIXER—PROGRAMMABLE GAIN
AMPLIFIER/ATTENUATOR
Signal-to-Noise Ratio (SNR)1, 2	Input to output (including CD in)		95/96
Step Size	All mixer inputs		+1.5		dB
Input Gain/Attenuation Range	All mixer inputs	−34.5		+12.0	dB

Rev. 0 | Page 4 of 20

AD1988A/AD1988B

			Typ
			AD1988A/
Parameter	Conditions/Comments	Min	AD1988B	Max	Unit
ANALOG LINE LEVEL OUTPUTS
Full-Scale Output Voltage	Line out drive enabled	1.0			V rms3
PORT-C, PORT-E, PORT-F, PORT-G, PORT-H, and	When ports are used as line level outputs	2.83			V p-p
MONO_OUT
Output Impedance1			300		Ω
External Total Load Impedance		10			kΩ
Output Capacitance1			15		pF
External Load Capacitance1				1000	pF
Total Harmonic Distortion (THD+N)1			−85/−85		dB
Dynamic Range1	−60 dB reference to fS A-weighted		+95/+101		dB
ANALOG HP DRIVE OUTPUTS
Full-Scale Output Voltage	Output drive enabled	1.0			V rms3
PORT-A, PORT-B, and PORT-D	When ports are used as outputs	2.83			V p-p
Output Impedance1				0.5	Ω
External Load Impedance1		32			Ω
Output Capacitance1			15		pF
External Load Capacitance1				1000	pF
Total Harmonic Distortion (THD+N)1	10 kΩ load		−83/−84		dB
	32 Ω load		−83/−84		dB
Dynamic Range1	−60 dB reference to fS A-weighted, 10 kΩ or		+95/+101		dB
	32 Ω loads
ANALOG INPUTS	When ports are used as inputs
PORT-G, PORT-H, or CD			1		V rms3
			2.83		V p-p
Microphone Boost Amplifiers
PORT-A, PORT-B, PORT-C, PORT-D, PORT-E, or PORT-F	0 dB boost		1		V rms3
			2.83		V p-p
	+10 dB boost		0.316		V rms3
			0.894		V p-p
	+20 dB boost		0.1		V rms3
			0.283		V p-p
	+30 dB boost		0.032		V rms3
			0.089		V p-p
Input Impedance1
PCBEEP			23		kΩ
PORT-G, PORT-H			60		kΩ
All others (with 0 dB boost)			150		kΩ
Input Capacitance1			5	7.5	pF
ANALOG INPUT PERFORMANCE
Total Harmonic Distortion Plus Noise (THD+N)1			−81/−82		dB
Dynamic Range	−60 dB in reference to fS A-weighted		+90/+92		dB
Signal-to-Noise Ratio (SNR)2			+90/+92		dB
STATIC DIGITAL SPECIFICATIONS
Digital I/O (DVIO)	DVIO @ 3.3 V ± 10%	2.97	3.3	3.63	V
VIH			2.0		V
VIL			0.8		V
VOH			2.4		V
VOL			0.6		V

Rev. 0 | Page 5 of 20

AD1988A/AD1988B

			Typ
			AD1988A/
Parameter	Conditions/Comments	Min	AD1988B	Max	Unit
POWER SUPPLY
Analog (AVDD)	3.3 V ± 5%
Power Supply Range		3.13	3.30	3.46	V
Power Dissipation			155/172		mW
Supply Current			47/52		mA
Digital (DVDD)	3.3 V ± 10%
Power Supply Range		2.97	3.30	3.63	V
Power Dissipation			247.5/238		mW
Supply Current			75/75		mA
Digital I/O (DVIO)	3.3 V ± 10%
Power Supply Range		2.97	3.30	3.63	V
Power Dissipation			3.96		mW
Supply Current			1.20		mA
Power Supply Rejection1 (AVDD)	100 mV p-p signal @ 1 kHz		80		dB V

1 Guaranteed, not tested.

2SNR measurement defined as “the difference in level between a reference output signal and the device output with no signal applied.” This definition is taken from B. Metzler, Audio Measurement Handbook, 1st edition, Audio Precision, Inc., 1993, p. 165.

3 RMS values assume sine wave input.

Table 2. Power-Down States

			AD1988A/AD1988B
Parameter	Comments	D-State	DIDD Typ		AIDD Typ	Unit
POWER-DOWN STATES
FUNCTION Node		D3	21/20		1.2/1.7	mA
DAC Pair	Powered down saves (each)	D3	6/6		5/5.6	mA
ADC Pair	Powered down saves (each)	D3	5.3/5.4		3.2/3.1	mA
Mixer Power Control (and Associated Amps)	Saves	D3	0/0		2.0/2.4	mA
MIC_BIAS	Powered down saves	D3	0/0		0.5/0.5	mA
RESET	Low (active) state		2.9/2.7		3.1/3.4	mA

Rev. 0 | Page 6 of 20