ANALOG DEVICES AD1981HD Service Manual
www.BDTIC.com/ADI
HD Audio SoundMAX® Codec
FEATURES
2 DAC channels: 16-, 20-, or 24-bit
2 ADC channels: 16- or 20-bit
HD audio sample rates
8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz,
44.1 kHz,
Greater than 90 dB dynamic range
S/PDIF output: 32 kHz, 44.1 kHz or 48 kHz, 16- or 24-bit
Digital beep and analog PC beep pass-through
Integrated headphone amplifiers on two ports
Port retasking
Selectable microphone and line inputs
Full analog mixer
Legacy inputs: CD and auxiliary inputs
External amplifier power-down (EAPD)
48-pin, Pb-free LQFP
48 kHz
GPIO
JACK
SENSE
HD AUDIO INTERFACE
SELECTOR
EQ
PC BEEP
GPIO
SENSE
PCM/AC3
S/PDIF TX
PCM
Σ-Δ DAC
DIGITAL
PC BEEP
FUNCTIONAL BLOCK DIAGRAM
S/PDIF_OUT
PC BEEP
G
M
SELECTOR
GA
GA GA
AD1981HD
ENHANCED FEATURES
No AFILT pins, results in BOM savings
5.0 V AV
Jack-sensing autoconfiguration options
Mute line output and monaural output (MONO_OUT)
Mute MONO_OUT when a device is in the line out jack
Selectable trip level: high/low supports all jack types
Peripheral identification/enumeration
Jack event/presence detection using SENSE or GPIO pins
Microphone to MONO_OUT for speakerphone applications
Advanced power management modes
4 software-controlled microphone bias pins
Up to 30 dB microphone boost
4 GPIOs—external control or traditional jack sense
GA
GA
M
M
Σ
M
MM
MM
GA
GA
supply, 3.3 V DVDD supply
DD
when headphones are used
AV
DD
AV
SS
PC BEEP
GAM
Σ
SELECTOR
GAM HP
SELECTOR
MIC
BOOST
MIC
BOOST
Z
HP
Z
Z
BIAS
GAM
SELECTOR
BIAS
GAM
SELECTOR
5V
RESET
MONO_OUT
PORT-A
HEADPHONE
MIC_BIAS-D
Z
PORT-D
LINE_OUT
MIC_BIAS-C
PORT-C
LINE_IN
MIC
BIAS
GAM
PCM/FLOAT32
Σ-Δ ADC
M G
SELECTOR
AUX
PORT-E
DIFF
AMP
CD_R
CD_GND
M
M
CD_L
SELECTOR
BOOST
MIC
BIAS
BOOST
Figure 1.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
Z
Z
Z
MIC_BIAS-F
PORT-F
REAR MIC
MIC_BIAS-B
PORT-B
FRONT MIC
04321-005
AD1981HD
www.BDTIC.com/ADI
TABLE OF CONTENTS
Functional Block Diagram Details................................................. 3
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 7
Environmental Conditions.......................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
REVISION HISTORY
6/05—Initial Version: Revision 0
HD Audio Codec Information ..................................................... 10
Jack Presence Detection................................................................. 15
HD Audio Style Jack Presence Detection ............................... 15
Classic Jack Presence Detection............................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
Rev. 0 | Page 2 of 16
AD1981HD
www.BDTIC.com/ADI
FUNCTIONAL BLOCK DIAGRAM DETAILS
OUTPUT_EN
NID: 0D
MIC_BIAS-C
PORT-C
LINE_IN
NID: 09
Z
Z
BIAS_EN
–46.5dB
BIAS_SEL
MIC
BIAS
OUTPUT_EN
0dB, 10dB, 20dB, 30dB
TO +3dB
GAM
2:1
BOOST
SELECTOR
OUTPUT_EN
MIC_BIAS-F
PORT-F
REAR MIC
NID: 18
Z
Z
BIAS_EN
–46.5dB
BIAS_SEL
TO +3dB
MIC
GAM
BIAS
2:1
0dB, 10dB, 20dB, 30dB
OUTPUT_EN
BOOST
SELECTOR
OUTPUT_EN
NID: 1F
MIC_BIAS-B
PORT-B
FRONT MIC
NID: 08
Z
BIAS_EN
0dB, 10dB, 20dB, 30dB
BIAS_SEL
M
BOOST
MIC
BIAS
M
NID: 1E
Σ
NID: 0C
M
GA
NID: 12
M
M
M
M
GA
NID: 1C
GA
NID: 1D
GA
NID: 13
GA
NID: 1B
–34.5 TO +12dB
8:1
NID: 19
SELECTOR
CD
DIFF
AMP
CD_L
CD_GND
CD_R
NID: 17
AUX
PORT-E
MIC_BIAS-D
PORT-D
BIAS_EN
–46.5dB
TO +3dB
GA
Z
HP
GAM
2:1
M
M
PC BEEP
LINE_OUT
OUTPUT_EN
HP_EN
BOOST
SELECTOR
–34.5 TO +12dB
NID: 0E
M
G
2:1
0dB, 10dB, 20dB, 30dB
Σ
0dB TO –45dB
SELECTOR
MONO_OUT
NID: 07
RESET
5V
PC BEEP
SS
DD
AV
AV
–46.5dB
TO +3dB
GAM
Σ
NID: 0F
6:1
NID: 0B
SELECTOR
PORT-A
HEADPHONE
NID: 06
HP
GAM
2:1
NID: 0A
HP_EN
SELECTOR
–46.5dB TO +3dB
S/PDIF_OUT
NID: 05
Z
BIAS_SEL
MIC
BIAS
NID: 1A
GA
NID: 11
DIGITAL
PC BEEP
NID: 16
RESET
NID: 10
PC BEEP IN
HD AUDIO INTERFACE
BIT_CLK
48kHz, 24-BIT
PCM/AC3
GPIO_3
GPIO_2
GPIO_1/JS_0
GPIO_0/JS_1
SENSE_A/SRC_B
SENSE_B/SRC_A
GPIO
NID: 01
JACK
SENSE
S/PDIF TX
48kHz, 24-BIT
PCM
2:1
SELECTOR
NID: 02
Σ-Δ DAC
EQ
NID: 03
SYNC
SDATA_IN
SDATA_OUT
Figure 2.
Rev. 0 | Page 3 of 16
M G
NID: 15
NID: 04
3.3V
SS
DD
DV
DV
0dB TO 22.5dB
Σ-Δ ADC
48kHz, 20-BIT
PCM/FLOAT32
04321-001
AD1981HD
www.BDTIC.com/ADI
SPECIFICATIONS
Test conditions, unless otherwise noted.
Table 1. Test Conditions
Parameter Typ Unit
TEMPERATURE 25 °C
DIGITAL SUPPLY (DVDD) 3.3 ±10% V
ANALOG SUPPLY (AVDD) 5.0 ±10% V
SAMPLE RATE (FS) 48 kHz
INPUT SIGNAL 1.0 kHz
ANALOG OUTPUT PASS BAND 20 to 20,000 Hz
V
IH
V
IL
V
IH
V
IL
2.0 V
0.8 V
2.4 V
0.6 V
DAC Test Con diti ons
rated
Calib
Output −3 dB relative to full scale
10 kΩ output load, Ports C, D, F, and mono
32 Ω output load, Port A
ADC Test Conditions
Calib
rated
0 dB PGA gain
Input −3.0 dB relative to full scale
Input sourced on Port B, 0 dB boost
Table 2. Analog Input
Parameter Min Typ Max Unit
PORTS B, C, D, E: 0 dB 1 V rms
2.83 V p-p
PORTS B, C, D, E: 30 dB 0.032 V rms
0.089 V p-p
PORTS B, C, D, E: 20 dB 0.1 V rms
0.283 V p-p
PORTS B, C, D, E: 10 dB 0.316 V rms
0.894 V p-p
PORT F, CD IN 1 V rms
2.83 V p-p
INPUT IMPEDANCE
INPUT CAPACITANCE 5 7.5 pF
1
RMS values assume sine wave input.
2
Guaranteed by design; not production tested.
2
20 kΩ
1
Table 3. Master Volume
Parameter Min Typ Max Unit
STEP SIZE (Ports A, B, C, D, E, MONO_OUT) 1.5 dB
OUTPUT GAIN RANGE –46.5 +3 dB
MUTE ATTENUATION OF 0 dB FUNDAMENTAL 80 dB
1
Guaranteed by design; not production tested.
Rev. 0 | Page 4 of 16
AD1981HD
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Table 4. Programmable Gain Amplifier—ADC
Parameter Min Typ Max Unit
STEP SIZE 1.5 dB
PGA GAIN RANGE SPAN 0.0 22.5 dB
Table 5. Analog Mixer—Input Gain/Amplifiers/Attenuators
Parameter Min Typ Max Unit
SIGNAL-TO-NOISE RATIO (SNR)
Line In to Line Out 85 dB
Microphone In to Line Out
STEP SIZE: ALL MIXER INPUTS (Except PC BEEP) 1.5 dB
STEP SIZE: PC BEEP 3.0 dB
INPUT GAIN RANGE: ALL MIXER INPUTS (Except PC BEEP) −34.5 +12.0 dB
DIGITAL PC BEEP −45.0 0.0 dB
1
Guaranteed by design; not production tested.
Table 6. Digital Decimation and Interpolation Filters
Parameter Min Typ Max Unit
PASS BAND 0 0.4 × F
PASS-BAND RIPPLE ±0.09 dB
TRANSITION BAND 0.4 × F
STOP BAND 0.6 × F
STOP-BAND REJECTION −74 dB
GROUP DELAY 16/F
GROUP DELAY VARIATION OVER PASS BAND 0 μs
1
Guaranteed by design; not production tested.
1
1
80 dB
Hz
S
S
S
0.6 × F
∞ Hz
S
sec
Hz
S
Table 7. Analog-to-Digital Converters
Parameter Min Typ Max Unit
RESOLUTION 20 Bits
TOTAL HARMONIC DISTORTION (THD) −95 dB
DYNAMIC RANGE (−60 dB Input, THD + N Referenced to Full Scale, A-Weighted) −85 dB
CROSSTALK: LINE INPUTS (Input L, Ground R, Read R; Input R, Ground L, Read L) −80 dB
CROSSTALK: LINE INPUTS AND OTHER INPUTS −100 −80 dB
GAIN ERROR (Full-Scale Span Relative to Nominal Input Voltage) ±10 %
INTERCHANNEL GAIN MISMATCH (Difference of Gain Errors) ±0.5 dB
ADC OFFSET ERROR ±5 mV
Table 8. Digital-to-Analog Converters
Parameter Min Typ Max Unit
RESOLUTION 24 Bits
TOTAL HARMONIC DISTORTION (Line Out) −92 dB
TOTAL HARMONIC DISTORTION (Headphone Out) −75 dB
DYNAMIC RANGE (−60 dB Input, THD + N Referenced to Full Scale, A-Weighted) 90 dB
GAIN ERROR (Full-Scale Span Relative to Nominal Input Voltage) ±10 %
INTERCHANNEL GAIN MISMATCH (Difference of Gain Errors) ±0.7 dB
DAC CROSSTALK1 (Input L, Zero R, Read R Out; Input R, Zero L, Read L Out) −80 dB
1
Guaranteed by design; not production tested.
Rev. 0 | Page 5 of 16
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