CXA1797 Просмотр технического описания (PDF) - Sony Semiconductor

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CXA1797

Dolby B-C Type Noise Reduction System with Recording Equalizer Amplifier

Sony Semiconductor 

Pin

Typical pin voltage

Symbol

I/O Z (in)

No.

DC AC

13 BIAS MTL1

39 BIAS MTL2

14 BIAS CrO1

VEE

—I—

38 BIAS CrO2

+1.25V

15 BIAS NORM1

37 BIAS NORM2

CXA1797Q

Equivalent circuit

VCC

147

VEE

Description

Recording bias

control voltage

setting

16 BIAS OUT1

36 BIAS OUT2

—

—O—

VCC

147

VEE

Recording bias

control voltage

output

17 NR TC

18 B/C TC

34 S TC

VCC

—

— I/O 17kΩ

VEE

17k 147

Time constant for

selecting NR mode

Time constant for

selecting B/C

mode

Time constant for

selecting S and

B/C modes

VCC

19 METER OUT1

2.4V — O —

33 METER OUT2

4k

DGND

VEE

100p

76.6k

—7—

Meter output

(sensitivity:

65 mV/dB)

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