
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
1
Copyright
Cirrus Logic, Inc. 1999
(All Rights Reserved)
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
FEATURES
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AC ‘97 2.0 compatible
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20-bit stereo output and 18-bit stereo input codec
with fixed 48 kHz sampling rate
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20-bit output and 18-bit input dual modem AFE
with fixed 48 kHz sampling rate
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Dedicated ADC for handset or speakerphone
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Four analog line-level stereo inputs for connec-
tion from LINE IN, CD, VIDEO, and AUX
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High quality pseudo-differential CD input
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Dual stereo line level output with independent 6-
bit volume control
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10 General Purpose I/O pins for Modem DAA
controls
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IEC-958 Digital Output (S/PDIF)
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Meets or exceeds Microsoft's
PC 98 and PC 99
audio performance requirements
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CrystalClear 3D Stereo Enhancement
DESCRIPTION
The CS4298
is an AC ‘97 compatible Audio/Mo-
dem Codec designed for PC multimedia systems.
Using the industry leading CrystalClear delta-
sigma and mixed signal technology, the CS4298 is
ideal for PC 98-compliant desktop, notebook, and
entertainment PCs, where high-quality audio and
modem features are required.The CS4298 offers
four channels of D/A and A/D conversion along
with analog mixing and 3D processing. For multi-
channel audio systems, the CS4298 can provide
four audio channels. For combined audio/modem
systems, the CS4298 can provide a modem AFE,
voice codec, and stereo audio codec..
ORDERING INFORMATION
CS4298
-KQ
CS4298
-JQ
64-pin TQFP 10x10x1.4mm
64-pin TQFP 10x10x1.4mm
VOL
MUTE
MUTE
MUTE
MUTE
VOL
VOL
VOL
+20dB
DAC
3D
STEREO TO
MONO MIXER
VOL
VOL
OUTPUT
BUFFER
OUTPUT
BUFFER
MASTER VOLUME
ALTERNATE VOLUME
MAIN D/A
CONVERTERS
PCM_OUT
PCM OUT
PATH
STEREO
INPUT
MIXER
STEREO
OUTPUT
MIXER
Σ
Σ
Σ
MIC1
AUX
CD
LINE
Mode Control
SYNC
SDATA_OUT
RESET#
MUTE
VOL
ADC
INPUT
MUX
VOL
MUTE
ADC
MAIN ADC GAIN
ADC
DAC
ALT_LINE_OUT
LINE_OUT
GPIO
BIT_CLK
SDATA_IN
AC-Link Interface
2/
2/
2/
2/
2/
2/
2/
10/
3/
MIC2
MIC SELECT
VIDEO
MUTE
VOL
2/
MUTE
VOL
ADC
DAC
VOL
VOL
VOL
VOL
(loopback) Vref
(loopback) HTX+
(loopback) Vref
(loopback) MTX+
MRX+
MRX-
HRX+
HRX-
HRX-
HRX+
MRX+
MRX-
Class AB
Dif out
+ -
- +
Class AB
Dif out
+ -
- +
MTX+
MTX-
HTX+
HTX-
SoundFusion
Audio/Modem
Codec ’97(AMC’97)
CS4298
AUG ‘99
DS315PP2