ANALOG DEVICES AD1984 Service Manual

a

High Definition Audio

www.BDTIC.com/ADI

FEATURES

FOUR 192 kHz DACs/ADCs

Two independent stereo DAC/ADC pairs
Simultaneous record of two stereo channels
Simultaneous playback of two stereo channels
Independent 8, 11.025, 16, 22.05, 32, 44.1,

48, 88.2, 96, 176.4, and 192 kHz sample rates
16, 20, and 24-bit resolution
Selectable stereo mixer on outputs

4-CHANNEL DIGITAL MICROPHONE INTERFACE

Four 192 kHz digital microphone channels
Supports multiple microphone types

Two microphones per pin (four total)

One microphone per pin (two total)
Low pin count, uses 3 pins
Stereo or quad array support
8, 11.025, 16, 22.05, 32, 44.1, 48, 88.2, 96,

176.4, and 192 kHz sample rates

16, 20, and 24-bit resolution

SoundMAX

Codec

AD1984

S/PDIF OUTPUT

Supports 44.1, 48, 88.2, 96, 176.4, and 192 kHz sample rates
16, 20, and 24-bit data; PCM, and AC3 formats
Digital PCM gain control

DEDICATED AUXILLARY PINS

Stereo CD/auxillary I/O port w/GND sense
Stereo auxillary/dock I/O port
Mono out pin for internal speakers or telephony

ENHANCED FEATURES

Two stereo headphone amplifiers
Microsoft Vista premimum logo for notebook and desktop

96+ dB audio outputs, 90+ dB audio inputs
Internal 32-bit arithmetic for greater accuracy
Impedance and presence detection on all jacks
Three independent microphone bias pins
Digital and analog PCBeep
Three general-purpose digital I/O (GPIO) pins

3.3 V analog and digital supply voltages
Advanced power management modes
48-lead, Pb-free LFCSP_VQ package

®

H
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I

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Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.

DAC1

DAC0

S/PDIF OUT

DIGITAL

MICROPHONE

DIGITAL
PCBEEP

ADC0

ADC1

DM_1/2

DM_3/4

DM_CLK

Figure 1. Functional Block Diagram

AD1984

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⌺

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⌺

HP

HP

⌺

One Technology Way, P.O.Box 9106, Norwood, MA 02062-9106 U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

PORT A

PORT D

MONO OUT

PORT E

PORT F

PCBEEP

PORT C

PORT B

AD1984

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CONTENTS

AD1984 Specifications .............................................. 4

Test Conditions ....................................................... 4

Performance ........................................................... 4

General Specifications ............................................... 4

HD–Audio Link Specification ..................................... 7

Power Down States .................................................. 7

Absolute Maximum Ratings ....................................... 8

ESD Sensitivity ........................................................ 8

Environmental Conditions ......................................... 8

Pin Configuration and Function Descriptions ................. 9

Digital Microphone Interface Timing Specifications ....... 12

HD Audio Widgets ................................................ 16

AD1984 HD Audio Parameter .................................. 17

Outline Dimensions ............................................... 20

Ordering Guide ..................................................... 20

REVISION HISTORY

1/07–Rev 0: Initial version

Rev. 0 | Page 2 of 20 | January 2007

GENERAL DESCRIPTION

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The AD1984 family of audio codecs and SoundMAX® software
provides superior High Definition audio quality that exceeds
Vista Premium performance. The AD1984 has four 192 kHz
DACs, four 192 kHz ADCs, S/PDIF output, a four-channel digi­tal microphone interface, Digital Beep and analog PCBeep.
These features make the AD1984 the right choice for desktop
and notebook PCs where performance is key.

The AD1984 is available in a 48-lead, Pb-free frame chip scale
package in both reels and trays. See Ordering Guide on Page 20.

ADDITIONAL INFORMATION

This data sheet provides a general overview of the AD1984
SoundMAX codec’s architecture and functionality. Additional
information on the AD1984 is available in the AD1984 Pro­grammers Reference Manual. Please contact your local ADI
sales representitive for more information. For information on
SoundMAX codecs and software see Analog Devices website at

http://www.analog.com/soundMAX.

JACK CONFIGURATIONS

The guideline shown in Table 1 should be used when selecting
ports for particular functions. The symbols used in this table are
defined as: LI = Line Level Input, LO = Line Level Output,
HP = Output capable of driving headphone load, MIC = Input
supports microphones with MIC bias and boost amplifier.

AD1984

Table 1. Port Assignments

Port HP MIC LO LI

Port A x x
Port B x x
Port C x x
Port D x x
Port E x x x
Port F x x
MONO_OUT x

Rev. 0 | Page 3 of 20 | January 2007

AD1984

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AD1984 SPECIFICATIONS

TEST CONDITIONS

Parameter Test Condition

Tem pe ra tu re
Digital Supply
Analog Supply
MIC_BIAS_IN (via Low-Pass Filter)
Sample Rate F
Input Signal (Frequency Sine Wave)
Amplitude for THD + N
Analog Output Pass Band
DAC 10 kΩ Output Load: Line Out tests

ADC 0 dB Gain

S

PERFORMANCE

Parameter Min Typ Max Unit

Line Out Drive (10 kΩ loads—DAC to Pin)
Total Harmonic Distortion (THD + N)
Dynamic Range (–60 dB in ref to fS A-Weighted)
Signal-to-Noise Ratio
Headphone Drive (32 Ω loads—DAC to Pin)
Total Harmonic Distortion (THD + N)
Dynamic Range (–60 dB in ref to f
Signal-to-Noise Ratio
Microphone/Line In (Pin to ADC, Mic Boost = 0 dB)
Total Harmonic Distortion (THD + N)
Dynamic Range (–60 dB in ref to f
Signal-to-Noise Ratio

25°C

3.3 V

3.3 V

5.0 V
48 kHz
1008 Hz
–3.0 dB Full Scale
20 Hz to 20 kHz

32 Ω Output Load: Headphone Tests

A-Weighted)

S

A-Weighted)

S

–86
96
96

–80
96
96

–81
90
90

dB
dB
dB

dB
dB
dB

dB
dB
dB

GENERAL SPECIFICATIONS

Parameter Min Typ Max Unit

DIGITAL DECIMATION AND INTERPOLATION FILTERS

Pass Band – fS (kHz) = 8 ~ 192 0 0.4 f
Pass-Band Ripple– f
Stop Band – f
Stop-Band Rejection – f
Group Delay – f
Group Delay Variation Over Pass Band 0 μs

ANALOG-TO-DIGITAL CONVERTERS

Resolution 24 Bits
Gain Error (Full-Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors) ±0.2 ±0.5 dB
ADC Offset Error
ADC Crosstalk
Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L) –85 dB
Line_In to Other –100 –80 dB

(kHz) = 8 ~ 192 ±0.005 dB

S

(kHz) = 8 ~ 192 0.6 f

S

S

1

(kHz) = 8 ~ 192 –100 dB

S

(kHz) = 8 ~ 192 20 1/f

1

1

S

S

2

±10 %

±5mV

Hz

Hz

S

Rev. 0 | Page 4 of 20 | January 2007

AD1984

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Parameter Min Typ Max Unit

DIGITAL-TO-ANALOG CONVERTERS

Resolution 24 Bits
Gain Error (Full Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors) ±0.5 dB
Total Audible Out-of-Band Energy (Measured from 0.6 × fS to 20 kHz)
DAC Crosstalk (Input L, Zero R, Measure R_OUT; Input R, Zero L, Measure L_OUT)

DAC VOLUMES

Step size (DAC-0, DAC-1) 1.5 dB
Output Gain/Attenuation Range –58.5 0 dB
Mute Attenuation of 0 dB Fundamental

1

ADC VOLUMES

Step size (ADCSEL-0, ADCSEL-1) 1.5 dB
PGA Gain/Attenuation Range –58.5 +22.5 dB

ANALOG MIXER

Signal-to-Noise Ratio Input to Output – Ports B, C, or F, to Port D Output 95 dB
Step Size: All Mixer Inputs –1.5 dB
Input Gain/Attenuation Range: All Mixer Inputs –34.5 +12.0 dB

ANALOG LINE LEVEL OUTPUTS

Full-Scale Output Voltage: Line out drive enabled 1.0 V rms
Ports A, D, E, F, and Mono Out 2.83 V p-p

Output Impedance
External Load Impedance
Output Capacitance
External Load Capacitance 1000 pF

ANALOG HP DRIVE OUTPUTS

Full-Scale Output Voltage: Line Out Drive Enabled 1.0 V rms
Ports A and D (when HP Drive is Enabled) 2.83 V p-p

Output Impedance
External Load Impedance
Output Capacitance
External Load Capacitance

ANALOG INPUTS

Input Voltages – Ports B, C, or E

Mic Boost = 0 dB 1

Input Voltages – Microphone Boost

Mic Boost = +10 dB 0.316

Amplifier, Ports B, C, or E

Mic Boost = +20 dB 0.1

Mic Boost = +30 dB 0.032

Input Impedance
PCBEEP
Ports B, C, E (Mic Boost = 0 dB)
Port F
Input Capacitance

1

1

1

1

–85 dB
–95 dB

±10 %

–80 dB

1

1

1

1

1

1

1

10 kΩ

32 Ω

190 Ω

15 pF

0.5 Ω

15 pF

1000 pF

V rms

2.83

V p-p
V rms

0.894

V p-p
V rms

0.283

V p-p
V rms

0.089

23
150
45

V p-p

kΩ
kΩ
kΩ

57.5pF

3

3

3

3

3

3

Rev. 0 | Page 5 of 20 | January 2007

AD1984

www.BDTIC.com/ADI

Parameter Min Typ Max Unit

MICROPHONE BIAS

MIC_BIAS-B, MIC_BIAS-C
MIC_BIAS_IN (Pin 33) = +5 V or +3.3 V V
V
V
MIC_BIAS_IN (Pin 33) = +5 V V
V
MIC_BIAS_IN (Pin 33) = +3.3 V V

Setting = Hi-Z Hi-Z

REF

Setting = 0 V 0 V dc

REF

Setting = 50% 1.65 V dc

REF

Setting = 80% 3.7 V dc

REF

Setting = 100% 3.9 V dc

REF

Setting = 80% 2.86 V dc

REF

V

Setting = 100% 3.0 V dc

REF

MIC_BIAS-E (When enabled as BIAS) V

Output Drive Current V

Setting = Hi-Z Hi-Z V dc

REF

Setting = 0 V 0 V dc

V

REF

V

Setting = 50% 1.65 V dc

REF

Setting = 80% 2.86 V dc

V

REF

V

Setting = 100% 3.0 V dc

REF

Setting = 50%, 80%, or 100% 1.6 mA

REF

GPIO 0

Input Signal High (VIH)DV
Input Signal Low ( V
Output Signal High (V
Output Signal Low (V
Input Leakage Current (Signal High) (I
Input Leakage Current (Signal Low) (I

)0DV

IL

) I

OH

)I

OL

IL

= –500 μADV

OUT

= +1500 μA0DV

OUT

) –150 nA

IH

)–50μA

× 0.60 DV

IO

× 0.72 DV

IO

IO

× 0.24 V

IO

IO

× 0.10 V

IO

V

V

GPIO 1 and 2

Input Signal High (VIH)AV
Input Signal Low ( V
Output Signal High (V
Output Signal Low (V
Input Leakage Current (Signal High) (I
Input Leakage Current (Signal Low) (I

)0AV

IL

)I

OH

)I

OL

IL

= –500 μAAV

OUT

= +1500 μA0AV

OUT

) –150 nA

IH

)–50μA

× 0.60 AV

DD

× 0.72 AV

DD

DD

× 0.24 V

DD

DD

× 0.10 V

DD

V

V

DM Clock

Output Signal High (VOH)I
Output Signal Low (V

)I

OL

= –500 μAAV

OUT

= +1500 μA0AV

OUT

× 0.72 AV

DD

DD

× 0.10 V

DD

V

DM 1/2 and 3/4

Input Signal High (V
Input Signal Low ( V

)AV

IH

)0AV

IL

Input Leakage Current (Signal High) (I
Input Leakage Current (Signal Low) (I

) –150 nA

IH

)–50nA

IL

× 0.60 AV

DD

DD

× 0.24 V

DD

V

POWER SUPPLY

Analog (AV
Power Supply Range
Power Dissipation
Supply Current
Digital (DV

Power Supply Range
Power Dissipation
Supply Current
Digital I/O (DV
Power Supply Range
Power Dissipation
Supply Current
Power Supply Rejection (reference to f

1

Guaranteed but not tested.

2

Measurements reflect main ADC.

3

RMS values assume sine wave input.

) 3.3 V ±5%

DD

) 3.3 V ±10%

DD

) 3.3 V ±10%

IO

3.13 3.30

3.46 V
99
31

2.97 3.30

3.63 V
162
58

2.97 3.30

3.63 V

3.96

1.2

100 mV p-p Signal @ 1 kHz)1 80 dB

S

mW
mA

mW
mA

mW
mA

Rev. 0 | Page 6 of 20 | January 2007