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參數(shù)資料
| 型號(hào)： | PACAC97T |
| 廠商： | California Micro Devices Corporation |
| 英文描述： | PC AUDIO RESISTOR NETWORK |
| 中文描述： | PC音頻阻網(wǎng)絡(luò) |
| 文件頁(yè)數(shù)： | 1/4頁(yè) |
| 文件大小： | 54K |
| 代理商： | PACAC97T |
2000 California Micro Devices Corp. All rights reserved.
9/27/2000
1
PACAC97
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
PC Audio Resistor Network
Features
Signal conditioning and gain setting resistors for
all standard audio functions
Low noise thin film resistors ±1% match
Better than 1% matching between channels
Gain modification by changing resistors
externally
Better than –90dB inter-channel and channel-to-
channel crosstalk
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
Applications
Analog audio system for Pentium II Class personal
computers, used in conjunction with Audio Codec,
CS4297 or AD1819A.
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
C0441098
R23
28
AMP_OUT1
IN1
AMP2–
IN2
GND
LINE_IN_L
AC97LINE_R
LINE_IN_R
AC97LINE_L
GND
AC97CD_R
AC97CD_L
AC97CD_GND
AC97MIC
MIC IN
MIC+
MIC
–
CD_R
CD_GND
CD_L
MIC_AMP_OUT
AMP_OUT2
AMP1
–
27
R23
R22
25
26
24
23
22
21
20
19
18
17
16
15
R21
R20
R19
R15
R16
100K
R18
R17
100K
R13
R2
6.8K
R1
1
2
3
4
5
6
8
9
10
14
12
11
R4
R3
R14
6.8 K
R11
R12
3.4K
R9
R10
6.8K
R7
6.8K
R8
6.8K
AC97AUX_R
AC97AUX_L
AUXIN_R
GND
7
13
R5
6.8K
R6
6.8K
AUXIN_L
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