CXA1897Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA1897Q

Dolby B Type Noise Reduction System with Recording/Playback Equalizer

Sony Semiconductor 

CXA1897Q

Pin Description

Pin

No.

Symbol

DC

voltage

I/O

I/O

resistance

Equivalent circuit

(Ta=25°C, Vcc=8 V, no signals)

Description

1 Vcc

8.0V — —

1

Vcc

Power supply pin.

Vcc

Vcc

2 RFC

8.0V — —

×3

×3

2

147

GND

×250

to RFS

Connects the resistor and

capacitor for providing a ripple

eliminated stable voltage in

the power supply.

3 AMS OUT 8.0V O —

Vcc

3

147

×2

GND

AMS output pin.

Connects the resistor and

capacitor which determine the

attack and recovery time

constants of the output to Vcc.

No signal supplied → High

level

Signal supplied → Low level

Vcc

Vcc

4 AMS GAIN 2.8V — —

147

4

×2

5p

10k

Connects the resistor which

determines the AMS signal

detection level.

GND

Vcc

5 AGC IN1 4.0V I 50kΩ

32 AGC IN2

147 10k

5

32

40k

×4

GND

VGS

Vcc

AGC signal input pin.

The input resistance varies

from 50kΩ to 10kΩ.

AGC is applied when a signal

of –30dB or more level is input

to AGC.

(Pin 33 external 47µF //

300kΩ)

—4—

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