CALIFORNIA MICRO DEVICES
PACAC97
PC Audio Resistor Network
Features
鈥?Signal conditioning and gain setting resistors for
all standard audio functions
鈥?Low noise thin film resistors 鹵1% match
鈥?Better than 1% matching between channels
鈥?Gain modification by changing resistors
externally
鈥?Better than 鈥?0dB inter-channel and channel-to-
channel crosstalk
鈥?Single 28-pin QSOP package
鈥?Saves board space and reduces assembly cost
Applications
鈥?Analog audio system for Pentium II Class personal
computers, used in conjunction with Audio Codec,
CS4297 or AD1819A.
Product Description
High quality audio systems have become standard for
most personal computers. Furthermore, the audio
functions have been migrating to the motherboard,
putting pressure on available board space. The
PACAC97 provides the components necessary for signal
conditioning of analog audio inputs for an AC97 compli-
ant Codec as well as gain setting resistors for head-
phone and microphone amplifiers. Since analog signal
levels can be as high as 2Vrms, the PACAC97 provides
6dB of attenuation (to 1Vrms) for LINE-IN, AUX, and CD
inputs. The CD line level inputs of the PACAC97 have an
additional ground signal, CD_GND, that supports the
pseudo differential amplifier present in AC97 Codecs.
This feature facilitates attenuation of common mode
ground noise typically present at the output of CD ROM
drives. Connecting the CD pins as indicated in the
application circuit provides attenuation of common mode
noise from the CD inputs, thereby producing a higher
quality CD signal. Finally, the device provides gain-
setting resistors for the headphone and microphone
amplifiers. The PACAC97 provides exceptional inter-
channel and channel-to-channel crosstalk attenuation
necessary for high quality audio.
The PACAC97 provides performance, high reliability, and
low cost through manufacturing efficiency, utilizing high
volume and low cost IC manufacturing and processes.
The process yields low noise and highly stable resistors
demanded in audio applications. In addition, the 28-pin
QSOP package is an industry standard that is easy to
handle in manufacturing and provides package reliability
SCHEMATIC CONFIGURATION
AMP1鈥?/div>
AMP_OUT1
28
R23
33K鈩?/div>
27
R23
22K鈩?/div>
IN1
26
25
R22
33K鈩?/div>
AMP_OUT2
AMP2鈥?/div>
24
R21
22K鈩?/div>
IN2
23
GND
22
MIC IN
21
MIC+
20
MIC_AMP_OUT
MIC鈥?/div>
19
R17
100K鈩?/div>
18
CD_R
17
CD_GND
16
CD_L
15
R20
4.7K鈩?/div>
R19
33K鈩?/div>
R13
6.8K鈩?/div>
R15
510K鈩?/div>
R14
6.8 K鈩?/div>
R16
100K鈩?/div>
R11
3.4K鈩?/div>
R9
6.8K鈩?/div>
R18
4.7K鈩?/div>
R12
3.4K鈩?/div>
R10
6.8K鈩?/div>
R4
6.8K鈩?/div>
R2
6.8K鈩?/div>
R5
6.8K鈩?/div>
R7
6.8K鈩?/div>
R1
6.8K鈩?/div>
R3
6.8K鈩?/div>
R6
6.8K鈩?/div>
R8
6.8K鈩?/div>
1
2
3
4
5
6
AC97MIC
7
GND
8
9
10
11
12
13
AUXIN_L
14
AUXIN_R
LINE_IN_L
AC97LINE_R
GND
LINE_IN_R
AC97LINE_L
AC97AUX_R
AC97CD_GND
AC97CD_L
AC97AUX_L
AC97CD_R
漏 2000 California Micro Devices Corp. All rights reserved.
9/27/2000
C0441098
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
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