®
a
AC’97 SoundMAX Codec
AD1887
AC’97 2.1 FEATURES
ENHANCED FEATURES
Variable Sample Rate Audio
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Software-Enabled VREFOUT Output for Microphones and
External Power Amp
Split Power Supplies (3.3 V Digital/5 V Analog)
Mobile Low-Power Mixer Mode
Extended 6-Bit Headphone Volume Control
Digital Audio Mixer Mode
AC’97 FEATURES
AC’97 2.2 Compliant
Greater than 90 dB Dynamic Range
Integrated Stereo Headphone Amplifier
Multibit ⌺-⌬ Converter Architecture for Improved S/N
Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Two Analog Line-Level Stereo Inputs for:
LINE-IN and CD
Mono MIC Input with Built-In Programmable Preamp
High-Quality CD Input with Ground Sense
Power Management Support
48-Terminal TQFP Package
FUNCTIONAL BLOCK DIAGRAM
ID0
ID1
AD1887
V
REF
V
CHIP SELECT
REFOUT
MIC
PREAMP
MIC
LINE_IN
CD
16-BIT
⌺-⌬ A/D
CONVERTER
PGA
PGA
16-BIT
⌺-⌬ A/D
RESET
CONVERTER
SYNC
SAMPLE
RATE
AC
LINK
BIT_CLK
SDATA_OUT
SDATA_IN
GA
M
GA
M
GA
M
GA
M
GA
M
GENERATORS
16-BIT
⌺-⌬ A/D
CONVERTER
M
M
GA
GA
M
GA
HP
HP_OUT_L
HP_OUT_R
16-BIT
⌺-⌬ A/D
CONVERTER
M
GA
HP
M
M
OSCILLATOR
G = GAIN
A = ATTENUATE
M = MUTE
XTL_OUT
XTL_IN
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., 2001