
REV. 0
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD1881A
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
AC’97 SoundMAX
Codec
FUNCTIONAL BLOCK DIAGRAM
G
A
M
G
A
M
G
A
M
SYNC
BIT_CLK
SPHAT
G
A
M
MV
MV
AD1881A
MIC1
MIC2
AUX
CD
VIDEO
LINE_OUT_L
MONO_OUT
LINE_IN
PHONE_IN
LINE_OUT_R
G = GAIN
M = MUTE
MV = MASTER VOLUME
NC = NO CONNECT
OSCILLATORS
XTL_OUT
XTL_IN
CS1
EAPD
MODE
RESET
SDATA_IN
CS0
MODE/SYNCHRONIZER
SDATA_OUT
G
A
M
G
A
M
G
A
M
16 D/A
CONVERTER
16 D/A
CONVERTER
PC_BEEP
PHAT
STEREO
MV
LNLVL_OUT_R
LNLVL_OUT_L
0dB/
S
PGA
PGA
16 A/D
CONVERTER
16 A/D
CONVERTER
SRATE
GENERATORS
A
D
A
M
G
A
M
NC
NC
POP
POP
A
M
AC’97 2.1 FEATURES
Variable Sample Rate
True Line-Level Output
Supports Secondary Codec Modes
AC’97 FEATURES
Designed for AC’97 Analog I/O Component
48-Lead LQFP Package
Multibit
Converter Architecture for Improved
S/N Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Four Analog Line-Level Stereo Inputs for Connection
from LINE, CD, VIDEO, and AUX
Two Analog Line-Level Mono Inputs for Speakerphone
and PC BEEP
Mono MIC Input Switchable from Two External
Sources
High Quality CD Input with Ground Sense
Stereo Line-Level Output
Mono Output for Speakerphone or Internal Speaker
Power Management Support
ENHANCED FEATURES
Mobile Low Power Mixer Mode
Digital Audio Mixer Mode
Full Duplex Variable 8 kHz to 48 kHz Sampling Rate
with 1 Hz Resolution
PHAT Stereo 3D Stereo Enhancement
Split Power Supplies (3.3 V Digital/5 V Analog)
Extended 6-Bit Master Volume Control
Audio Amp Power-Down Signal
SoundMAX is a registered trademark and PHAT is a trademark of Analog Device, Inc.