ANALOG DEVICES AD1987 Service Manual

High Definition Audio

DAC2

DAC3

DAC0

DAC1

S/PDIF OU T

DIGITAL
PCBEEP

MONO OUT

PORT H

POR T G

PORT A

AD1987

H
D

A
U
D

I

O

I
N
T
E
R
F
A
C
E

PORT E

PORT B

PORT C

ADC1

ADC0

⌺

S/PDIF Tx

POR T D

POR T F⌺

GPIO

⌺

⌺

⌺

⌺

⌺

⌺

⌺

⌺

www.BDTIC.com/ADI

SoundMAX Codec

AD1987

FEATURES

3 stereo headphones
Microsoft Vista Premium logo for desktop

95 dB audio outputs, 90 dB audio inputs
Internal 32-bit arithmetic for greater accuracy
Impedance and presence detection on all jacks
Retaskable jacks
4 independent microphone bias pins
Digital and analog PCBeep
C/LFE channel swapping
2 general-purpose digital I/O (GPIO) pins
Advanced power management modes
48-lead LFCSP_VQ package

EIGHT 192 kHz DACs

4 independent stereo DAC pairs

7.1 surround sound or 5.1 stereo out 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

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

FOUR 96 kHz ADCs

2 independent stereo ADC pairs
Simultaneous record of up to 4 channels
Independent 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz,

44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz sample rates
16-, 20-, and 24-bit PCM resolution
Support for quad microphone arrays

S/PDIF OUTPUT

Supports 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and

192 kHz sample rates
16-, 20-, and 24-bit data; PCM, AC3
Digital PCM gain control

DEDICATED AUXILIARY PINS

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

Rev. A

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.

Figure 1. AD1987 Block Diagram

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2008 Analog Devices, Inc. All rights reserved.

AD1987

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TABLE OF CONTENTS

Features ................................................................. 1

Revision History ...................................................... 2

General Description ................................................. 3

Additional Information .......................................... 3

Jack Configuration ................................................ 3

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

HD Audio Widgets ................................................ 12

HD Audio Parameters ............................................. 13

Widget Parameters ................................................. 14

Connection List ..................................................... 15

Default Configuration Bytes ..................................... 16

Outline Dimensions ............................................... 17

Ordering Guide ..................................................... 17

REVISION HISTORY

3/08—Rev. 0 to Rev. A

Revised notes in Power-Down States ............................ 7

Corrected PCBEEP pin number

AD1987 Pin Descriptions ........................................ 10

Corrected VREF_FLT pin number

AD1987 Pin Descriptions ........................................ 10

Rev. A | Page 2 of 20 | March 2008

GENERAL DESCRIPTION

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AD1987

The AD1987 audio codec and SoundMAX® software provides
superior HD audio quality that exceeds Vista Premium perfor­mance. The AD1987 has eight DACs and four ADCs, three
stereo headphone ports, C/LFE swapping, digital and analog
PCBeep, and S/PDIF output, making the AD1987 the right
choice for desktop PCs where performance is the primary
consideration.

The jack retasking feature on this product supports various con­figurations including platforms for 7.1 on 5 jacks, 5.1 on 3 jacks,
and front panel jack retasking.

The AD1987 is available in a 48-lead Pb-free frame chip scale
package in both reels and trays. See Ordering Guide on Page 17.

ADDITIONAL INFORMATION

This data sheet provides a general overview of the AD1987
SoundMAX codec’s architecture and functionality. Additional
information on the AD1987 is available in the AD1987 Pro­grammers Reference Manual. Please contact your local Analog
Devices Inc. sales representative for more information. For
information on SoundMAX codecs and software, see Analog
Devices website at http://www.analog.com/soundMAX.

JACK CONFIGURATION

The guidelines shown in Table 1 through Table 3 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.

Table 2. Retasking to Support 7.1 Audio on 5 Jacks

Port HP MIC LO LI

Port A – Front Panel Headphone x x x x
Port B – Front Panel Microphone x x x x
Port C – Rear Panel Line-In/Surround-

Center/Side (7.1)
Port D – Rear Panel Front/Headphone x x x
Port E – Rear Panel Microphone x x x
Port F – Rear Panel Surround-Rear (5.1) x
Port G – Rear Panel C/LFE x

Table 3. Desktop Applications with Retasking to Support 5.1
Audio on 3 Jacks

Port HP MIC LO LI

Port A – Front Panel Headphone x x x x
Port B – Front Panel Microphone x x x x
Port C – Rear Panel Line-In/Surround-Rear

(5.1)
Port D – Rear Panel Front/Headphone x x x
Port E – Rear Panel Microphone /C/LFE x x x

xxx

xxx

Table 1. Desktop Applications with Discrete Jacks (Default
Configuration)

Port HP MIC LO LI

Port A – Front Panel Headphone x x x x
Port B – Front Panel Microphone x x x x
Port C – Rear Panel Line-In x x x
Port D – Rear Panel Front/Headphone x x x
Port E – Rear Panel Microphone x x x
Port F – Rear Panel Surround-Rear (5.1) x
Port G – Rear Panel C/LFE x
Port H – Rear Panel Surround-

Center/Side (7.1)

x

Rev. A | Page 3 of 20 | March 2008

AD1987

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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
Input Ports (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

–85
95
95

–83
95
95

–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 0 0.4 f
Pass-Band Ripple ±0.005 dB
Stop Band 0.6 f
Stop-Band Rejection –100 dB
Group Delay 20 1/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

1

1

1

—fS = 8 kHz to 192 kHz

2

S

S

±10 %

±5mV

Hz

Hz

S

Rev. A | Page 4 of 20 | March 2008

AD1987

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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, DAC-2, DAC-3) 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

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

1

10 kΩ

32 Ω

190 Ω

15 pF

1000 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. A | Page 5 of 20 | March 2008

AD1987

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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 = High-Z High-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 = High-Z High-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 and GPIO 1

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 μA

IH

)–50μA

× 0.60 DV

IO

× 0.72 DV

IO

IO

× 0.24 V

IO

IO

× 0.10 V

IO

V

V

POWER SUPPLY

Analog (AVDD) 3.3 V ± 5%
Power Supply Range
Power Dissipation
Supply Current

3.13 3.30
135
41

3.46 V
mW
mA

Digital (DVDD) 3.3 V ± 10%
Power Supply Range

Power Dissipation
Supply Current
Digital I/O (DV

) 3.3 V ± 10%

IO

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.

2.97 3.30
218
66

2.97 3.30

3.96

1.20

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

S

3.63 V
mW
mA

3.63 V
mW
mA

Rev. A | Page 6 of 20 | March 2008