PACAC97Q datasheet(3/4 Pages) CALMIRCO

3 / 4 page

9/27/2000

PACAC97

CALIFORNIA MICRO DEVICES

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

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 10K

Ω resistor while the IN1 pin is

Figure 2*.

terminated with a 1K

Ω 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.

510

Ω

100

Ω

10K

Ω

6.8K

Ω

6.8K

Ω

5,7,22

TP2

18 MIC_AMP_OUT

2Vms

AC97CD_R

6 AC97MIC

TP1

10K

Ω

GND

Figure 1*.

10K

Ω

33K

Ω

22K

Ω

33K

Ω

22K

Ω

5, 7, 22

Ω

2Vms

GND

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

10K

Ω 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.

Channel-to-Channel Crosstalk: Microphone CD

Inter-channel Crosstalk: AMP2-AMP1 (LINE_OUT)

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