PACAC97 Datasheet, PDF (3/4 Pages) California Micro Devices Corp – PC AUDIO RESISTOR NETWORK

CALIFORNIA MICRO DEVICES
PACAC97
Channel-to-Channel Crosstalk: Microphone CD
Figure 1 shows a cross talk measurement of the micro-
phone to the Right Codec CD signal. The microphone
amplifier output pin (pin 18) is driven with a 2Vrms
signal. The Right CD Codec signal is terminated by a
10KΩ load resistor while pins 5,7,17 and 22 on the
device are grounded. Crosstalk measured over the audio
band of 20Hz–20KHz is in excess of –90dB.
2Vms
GND
18 MIC_AMP_OUT 17
510Ω
6.8KΩ
100Ω
6.8KΩ
GND
6 AC97MIC
TP2
5,7,22
GND
10KΩ
GND
Figure 1*.
8 AC97CD_R
TP1
10KΩ
GND
Inter-channel Crosstalk: AMP2-AMP1 (LINE_OUT)
Figure 2 shows a crosstalk measurement of Left to Right
channel for the gain setting resistors of the headphone
amplifier (referred to as AMP1 and AMP2). The IN2
(output from Codec) and the AMP_OUT2 pin (pins 23
and 25) are driven by a 2Vrms source. The AMP_OUT1
is terminated by a 10KΩ resistor while the IN1 pin is
terminated with a 1KΩ resistor which represents the
output impedance of the LINE_OUT output of the Codec.
Pins 5, 7, 22 and 24, on the device are grounded.
Crosstalk measured over the audio band of
20Hz to 20KHz is in excess of –90dB.
10KΩ
GND
1KΩ
GND
28
27
26
33KΩ
22KΩ
2Vms
2Vms
GND
GND
25
24
23
33KΩ
22KΩ
5, 7, 22
Figure 2*.
© 2000 California Micro Devices Corp. All rights reserved.
9/27/2000 215 Topaz Street, Milpitas, California 95035
Tel: [phone]
Fax: [phone]
www.calmicro.com
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