a
FEATURES
AC ’97 2.3 COMPATIBLE FEATURES
S/PDIF Output, 20 Bits Data Format, Supporting
48 kHz and 44.1 kHz Sample Rates
Integrated Stereo Headphone Amplifier
Variable Sample Rate Audio
External Audio Power-Down Control
Greater than 90 dB Dynamic Range
Stereo Full-Duplex Codec
20-Bit PCM DAC
3 Analog Line-Level Stereo Inputs for
Line-In, AUX, and CD
Mono Line-Level Phone Input
Dual MIC Input with Built-In Programmable Preamp
High Quality CD Input with Ground Sense
AC ’97 SoundMAX Codec
AD1981B
Mono Output for Speakerphone or Internal Speaker
Power Management Support
48-Lead LQFP Package, Lead-Free Available
ENHANCED FEATURES
Stereo MIC Preamps Support
Built-In Digital Equalizer Function for Optimized
Speaker Sound
Full-Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Jack Sense Pins Provide Automatic Output Switching
Software Programmed V
REFOUT
Output for Biasing
Microphone and External Power Amp
Split Power Supplies: 3.3 V Digital and 5 V Analog
Multiple Codec Configuration Options
®
FUNCTIONAL BLOCK DIAGRAM
V
REFOUT
V
REF
XTL_OUT XTL_IN SPDIF
AD1981B
G
MIC PREAMP
MIC1
MS
VOLTAGE
REFERENCE
CODEC CORE
G
G
2CMIC
SPDIF
TX
MIC2
PHONE_IN
CD_L
CD_GND
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
CD
DIFF AMP
PCM L/R
ADC RATE
RECORD
SELECTOR
PLL
ID0
G
M
16-BIT
- ADC
16-BIT
- ADC
ID1
G
M
G
G
MONO_OUT
M
A
MIX
M
M
16-BIT
- ADC
16-BIT
- ADC
AC '97 INTERFACE
ADC
AND
DAC
SLOT
LOGIC
RESET
SYNC
BIT_CLK
EQ CORE STORAGE
M
GA
20-BIT
- DAC
BYPASS
SDATA_OUT
EQ
HP_OUT_L
HP
M
A
OUTPUT SELECTOR
M
GA
GA
M
M
M
M
GA
GA
GA
GA
M
M
M
M
M
GA
GA
GA
20-BIT
- DAC
PCM FRONT
DAC RATE
BYPASS
SDATA_IN
EQ
LINE_OUT_L
MZ
A
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH Z
LINE_OUT_R
MZ
A
AC '97
CONTROL
REGISTERS
HP_OUT_R
HP
M
A
M
ANALOG MIXING
CONTROL LOGIC
EAPD
JS0
JS1
EAPD
REV. B
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© 2003 Analog Devices, Inc. All rights reserved.
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