
Copyright
Cirrus Logic, Inc. 1999
(All Rights Reserved)
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
CS4297A
Preliminary Product Data Sheet
CrystalClear
SoundFusion Audio
Codec ’97
FEATURES
n
AC ’97 2.1 Compatible
n
Industry Leading Mixed Signal Technology
n
20-bit Stereo Digital-to-Analog Converter and 18-bit Ste-
reo Analog to Digital Converter
n
Four Analog Line-level Stereo Inputs for Connection
from LINE IN, CD, VIDEO, and AUX
n
Two Analog Line-level Mono Inputs for Modem Sub-
system and Internal PC Beeper
n
Mono Microphone Input Switchable from Two External
Sources
n
High Quality Pseudo Differential CD Input
n
Dual Stereo Line-level Outputs
n
Extensive Power Management Support
n
Meets or Exceeds Microsoft’s
PC 98 and PC 99 Audio
Performance Requirements
n
CrystalClear 3D Stereo Enhancement
n
S/PDIF Digital Audio Output
DESCRIPTION
T
he CS4297A
is an AC ’97 2.1 compatible stereo
audio codec designed for PC multimedia systems.
Using
the
industry
delta-sigma and mixed signal technology, the
CS4297A paves the way for PC 98 and
PC 99-compliant
desktop,
entertainment PCs, where high-quality audio is
required.
leading
CrystalClear
portable,
and
The CS4297A, when coupled with a PCI audio ac-
celerator or core logic supporting the AC ‘97
interface, implements a cost effective, superior
quality, audio solution. The CS4297A surpasses
audio quality standards such as PC 98, PC 99,
and AC ‘97 2.1.
ORDERING INFO
CS4297A
-KQ, 48-pin TQFP, 9x9x1 mm
CS4297A
-JQ, 48-pin TQFP, 9x9x1 mm
DS318PP3
MAR ‘99
AC’97
REGISTERS
LINE
CD
AUX
VIDEO
MIC1
MIC2
PHONE
PC_BEEP
LINE_OUT
ALT_LINE_OUT
MONO_OUT
ANALOG INPUT MUX
AND OUTPUT MIXER
AC-LINK AND AC’97
REGISTERS
GAIN / MUTE CONTROLS
INPUT
MUX
Σ
OUTPUT
MIXER
MIXER / MUX SELECTS
AC-
LINK
PWR
MGT
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET#
PCM_DATA
DAC
20 bits
ADC
18 bits
S/PDIF
PCM_DATA