®
a
AC ‘97 SoundMAX Codec
AD1981A
AC ’97 2.2-COMPLIANT CODEC
High Quality CD Input with Ground Sense
Mono Output for Speakerphone or Internal Speaker
Power Management Support
48-Lead LQFP Package
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
16-Bit Stereo Full-Duplex Codec
20-Bit DAC Input
ENHANCED FEATURES
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 VREFOUT Output for Microphone
Bias and External Power Amp
Three Analog Line-Level Stereo Inputs for
LINE-IN, AUX, and CD
Mono Line-Level Phone Input
Mono MIC Input with Built-In Programmable Preamp
Split Power Supplies: 3.3 V Digital and 5 V Analog
Multiple Codec Configuration Options
FUNCTIONAL BLOCK DIAGRAM
V
V
REFOUT
XTL_OUT XTL_IN
ID1
ID0
REF
MIC PREAMP
G
AD1981A
MIC_IN
AUX
G
VREF
XTAL OSCILLATOR
LINK PORT/
ID SELECT
PHONE_IN
PLL CLOCK
GENERATOR
A/D SAMPLE RATE
GENERATOR
CD_L
CD_GND
CD_R
CD
DIFF AMP
16-BIT ꢀ-ꢁ A/D
CONVERTER
G
G
M
M
LINE_IN
16-BIT ꢀ-ꢁ A/D
CONVERTER
D/A SAMPLE RATE
GENERATOR
16-BIT ꢀ-ꢁ A/D
CONVERTER
G
M
16-BIT ꢀ-ꢁ A/D
CONVERTER
G
M
M
20-BIT ꢀ-ꢁ D/A
CONVERTER
SPKR
EQ
GA
HP_OUT_L
M
M
HP
A
A
20-BIT ꢀ-ꢁ D/A
SPKR
EQ
GA
M
CONVERTER
GA
M
GA
M
GA
M
LINE_OUT_L
GA
M
GA
M
GA
M
GA
M
GA
M
EQ COEFF STORAGE
MONO_OUT
M
A
AC ’97 CONTROL REGISTERS
ANALOG
MUTE
CONTROL
LOGIC
M
M
M
LINE_OUT_R
HP_OUT_R
A
A
M
SPDIF
SPDIF
JACK SENSE
EAPD
EAPD
HP
JS0
JS1
KEY:
G = GAIN
A = ATTENUATE
M = MUTE
SoundMAX is a registered trademark of Analog Devices, Inc.
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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002