PACAC97 California Micro Devices Corp, PACAC97 Datasheet
PACAC97
Manufacturer Part Number
PACAC97
Description
PC AUDIO RESISTOR NETWORK
Manufacturer
California Micro Devices Corp
Datasheet
1.PACAC97.pdf
(4 pages)
© 2000 California Micro Devices Corp. All rights reserved.
9/27/2000
Features
• Signal conditioning and gain setting resistors for
• Low noise thin film resistors ±1% match
• Better than 1% matching between channels
• Gain modification by changing resistors
• Better than –90dB inter-channel and channel-to-
• Single 28-pin QSOP package
• Saves board space and reduces assembly cost
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
215 Topaz Street, Milpitas, California 95035
all standard audio functions
externally
channel crosstalk
CALIFORNIA MICRO DEVICES
AMP_OUT1
LINE_IN_L
28
1
R2
6.8KΩ
R1
6.8KΩ
33KΩ
R23
LINE_IN_R
AMP1–
27
2
R4
6.8KΩ
R3
6.8KΩ
22KΩ
R23
AC97LINE_R
IN1
26
3
AC97LINE_L
AMP_OUT2
25
4
33KΩ
PC Audio Resistor Network
R22
AMP2–
GND
24
5
SCHEMATIC CONFIGURATION
22KΩ
R21
AC97MIC
IN2
23
6
Tel: (408) 263-3214
GND
GND
22
7
AC97CD_R
MIC IN
21
8
R20
4.7KΩ
AC97CD_GND
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
MIC+
Applications
• Analog audio system for Pentium II Class personal
20
9
computers, used in conjunction with Audio Codec,
CS4297 or AD1819A.
R19
33KΩ
AC97CD_L
MIC–
19
10
100KΩ
R18
4.7KΩ
MIC_AMP_OUT
R17
AC97AUX_R
Fax: (408) 263-7846
18
11
R15
510KΩ
R16
100KΩ
AC97AUX_L
CD_R
17
12
R13
6.8KΩ
R14
6.8 KΩ
CD_GND
AUXIN_L
16
13
R11
3.4KΩ
R12
3.4KΩ
R5
6.8KΩ
R6
6.8KΩ
AUXIN_R
CD_L
15
14
www.calmicro.com
R9
6.8KΩ
R10
6.8KΩ
R7
6.8KΩ
R8
6.8KΩ
PACAC97
C0441098
1
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PACAC97 Summary of contents
Page 1
... 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. ...
Page 2
... Specifically, stereo cross talk (Left to Right) and channel to channel cross talk must be minimized. For this reason much attention has been paid to the circuit layout of the PACAC97 in order to provide the necessary damping for signals in the 20Hz–20KHz audio band. Three examples are provided to illustrate inter-channel and channel- channel cross talk measurements that have been performed on the PACAC97 ...
Page 3
... GND GND 33KΩ 22KΩ 33KΩ Figure 2*. Tel: (408) 263-3214 GND 8 AC97CD_R TP1 10KΩ GND 2Vms GND GND 22KΩ Fax: (408) 263-7846 www.calmicro.com PACAC97 3 ...
Page 4
... Tel: (408) 263-3214 TP1 10KΩ GND & Fax: (408) 263-7846 www.calmicro.com PACAC97 9/27/2000 ...