ANALOG DEVICES AD1984A Service Manual

High Definition Audio

ADC0

ADC1

DAC0

DM_CLK

DM_1/2
DM_2

DIGITAL

MICROPHONE

MONO OUT

PORT A

PORT D

PORT F

AD1984A

H
D

A
U
D

I

O

I
N
T
E
R
F
A
C
E

PORT B

PORT E

PORT C

DAC1

⌺

⌺

⌺

⌺

⌺

PCBEEP

HP

HP

⌺

DIGITAL
PCBEEP

S/PDIF

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SoundMAX Codec

AD1984A

FEATURES

Microsoft Vista Premium Logo for desktop

96+ dB audio outputs, 90 dB audio inputs

WLP 3.0 and 4.0
Security feature prevents unauthorized recording
2 stereo headphone amplifiers
Internal 32-bit arithmetic for greater accuracy
Impedance and presence detection on all jacks
Full analog mixer with DAC inputs
3 independent microphone bias pins
Digital and analog PCBeep
3 general-purpose digital I/O (GPIO) pins

3.3 V analog supply voltage

1.7 V to 1.9 V or 3.3 V digital supply voltages

1.5 V or 3.3 V HD Audio link signaling voltage
Advanced power management modes
48-lead, RoHS compliant LFCSP_VQ package

192 kHz DACs/ADCs

2 independent stereo DAC/ADC pairs
Simultaneous record of 2 stereo channels
Simultaneous playback of 2 stereo channels
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
Selectable stereo mixer on outputs

STEREO DIGITAL MICROPHONE INTERFACE

Two 192 kHz digital microphone channels
Supports 1 or 2 microphones per pin
Selectable bit clock rates of 1.5 MHz, 2.0 MHz, and 3.0 MHz
Mono and stereo array support
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

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 and AC3 formats
Digital PCM gain control

AUXILIARY PINS

Stereo CD/auxiliary I/O port with ground sense
Stereo auxiliary/dock I/O port
Mono out pin for internal speakers or telephony

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.

Figure 1. Functional 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.

AD1984A

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TABLE OF CONTENTS

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

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

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

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

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

AD1984A Specifications ............................................ 4

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

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

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

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

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

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

ESD Caution ........................................................ 8

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

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

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

HD Audio Widgets ................................................ 14

HD Audio Parameters ............................................. 15

Widget Parameters ................................................. 16

Connection List ..................................................... 17

Default Configuration Bytes ..................................... 18

Outline Dimensions ............................................... 19

Ordering Guide ..................................................... 19

REVISION HISTORY

4/08—Rev 0. Initial version

Rev. 0 | Page 2 of 20 | April 2008

GENERAL DESCRIPTION

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AD1984A

The AD1984A audio codec and SoundMAX® software provide
superior high definition audio quality that exceeds Vista Pre­mium performance. The AD1984A has two 192 kHz DAC pairs,
two 192 kHz ADC pairs, an S/PDIF output, a 2-channel digital
microphone interface, and digital and analog PCBeep. These
features make the AD1984A the right choice for desktop and
notebook PCs where performance is key.

The AD1984A is available in a 48-lead, RoHS compliant lead
frame chip scale package in both reels and trays. See Ordering

Guide on Page 19.

ADDITIONAL INFORMATION

This data sheet provides a general overview of the AD1984A
SoundMAX codec’s architecture and functionality. Detailed
widget information is available in the AD1984A Programmers
Reference Manual. Please contact your local Analog Devices,
Inc., sales representative for more information.

JACK CONFIGURATION

The guidelines shown in Table 1 through Table 3 should be
used when selecting ports for particular functions.

Table 1. Typical Desktop Configuration

Port Function

Port A Front Panel Headphone
Port B Front Panel Microphone
Port C Rear Panel Line-In/Microphone
Port D Rear Panel Line-Out/Headphone
S/PDIF Optical/RCA S/PDIF Output

Table 3. Typical Notebook Configuration with Dock
Interface

Port Function

Port A Headphone
Port B Microphone
Port C Internal Microphone
Port D Dock Line-Out/Headphone
Port E Dock Line-In/Microphone
Port F Internal Stereo Speakers
S/PDIF Optical/RCA S/PDIF Output

Table 2. Typical Notebook Configuration

Port Function

Port A Headphone
Port B Microphone
Port C Internal Microphone
Port F Internal Stereo Speakers
S/PDIF Optical/RCA S/PDIF Output

Rev. 0 | Page 3 of 20 | April 2008

AD1984A

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AD1984A 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

S

Input Signal (Frequency Sine Wave)
Amplitude for THD + N
Analog Output Pass Band

1

DAC

ADC 0 dB Gain

1

DAC/ADC tests are performed with AES-17 filter enabled.

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

A-Weighted)

S

A-Weighted)

S

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
10 kΩ Output Load: Line-Out Tests
32 Ω Output Load: Headphone Tests

–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—f

= 8 kHz to 192 kHz

S

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) ±10 %
Interchannel Gain Mismatch (Difference of Gain Errors) ±0.2 ±0.5 dB
ADC Offset Error
ADC Crosstalk

1

1

Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L) –85 dB
Line Inputs to Other –100 –80 dB

Rev. 0 | Page 4 of 20 | April 2008

1

S

S

Hz

Hz

±5mV

S

AD1984A

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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 1.5 dB
Output Gain/Attenuation Range –58.5 0 dB
Mute Attenuation of 0 dB Fundamental

1

ADC VOLUMES

Step Size 1.5 dB
PGA Gain/Attenuation Range –58.5 +22.5 dB

ANALOG MIXER

Signal-to-Noise Ratio Input to Output—Ports B, C, E, 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 1.0

Ports A, D, E, F, and Mono Out

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

ANALOG HP DRIVE OUTPUTS

Full-Scale Output Voltage 1.0

Ports A and D

Output Impedance
External Load Impedance
Output Capacitance
External Load Capacitance

ANALOG INPUTS

Input Voltages—Ports B, C, E, or F

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

V rms

2.83

1

1

1

10 kΩ

190 Ω

15 pF

V p-p

V rms

2.83

1

1

1

1

32 Ω

15 pF

0.5 Ω

1000 pF

V p-p

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

Rev. 0 | Page 5 of 20 | April 2008

AD1984A

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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
MIC_BIAS_IN (Pin 33) = 5 V V
V
MIC_BIAS_IN (Pin 33) = 3.3 V V

Setting = High-Z High-Z

REF

V

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

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

IH

)–50μA

IL

= –500 μADV

OUT

= +1500 μA0DV

OUT

) 150 nA

× 0.60 DV

IO

× 0.72 DV

IO

IO

× 0.24 V

IO

IO

× 0.10 V

IO

V

V

GPIO 1 and GPIO 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

IH

)–50μA

IL

= –500 μAAV

OUT

= +1500 μA0AV

OUT

) 150 nA

× 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 DM_2

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

S/PDIF

Input Signal High (V
Input Signal Low (V
Output Signal High ( V
Output Signal Low (V

)DV

IH

)0DV

IL

) I

OH

)I

OL

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

= –500 μADV

OUT

= +1500 μA0DV

OUT

) 150 nA

IH

)–50μA

IL

× 0.60 DV

IO

× 0.72 DV

IO

IO

× 0.24 V

IO

IO

× 0.10 V

IO

V

V

Rev. 0 | Page 6 of 20 | April 2008