a
AC’97 SoundMAX® Codec
AD1887
ENHANCED FEATURES
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 2.1 FEATURES
Variable Sample Rate Audio
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
AD1887
MIC
ID1
VREF
CHIP SELECT
VREFOUT
MIC
PREAMP
SELECTOR
PGA
CD
16-BIT
⌺-⌬ A/D
CONVERTER
PGA
LINE_IN
16-BIT
⌺-⌬ A/D
CONVERTER
RESET
SYNC
GA
GA
GA
GA
GA
M
M
M
M
SAMPLE
RATE
GENERATORS
M
HP
M
M
GA
GA
GA
16-BIT
⌺-⌬ A/D
CONVERTER
M
SELECTOR
HP_OUT_R
HP
BIT_CLK
SDATA_OUT
M
HP_OUT_L
AC
LINK
GA
16-BIT
⌺-⌬ A/D
CONVERTER
SDATA_IN
M
M
G = GAIN
A = ATTENUATE
M = MUTE
OSCILLATOR
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, nor for any infringements of patents or other rights of third parties that
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
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
