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CXA1797Q

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

55 PB IN B2

56 PB IN A2

60 PB IN A1

61 PB IN B1

0.0V –21dBv I 50kΩ

CXA1797Q

Equivalent circuit

VCC

Description

147

VCT

Head select input

of playback

equalizer amplifier

VEE

VCC

57 REC IREF

VEE+

———

1.25V

VEE

58 GND

0V

———

VEE+

59 DOLBY IREF

———

1.25V

147

—11—

Reference current

of recording

147

equalizer amplifier

VCC

Ground (center

capacitance when

using a single

power supply)

VEE

VCC

VEE+1.25V Reference current

VEE

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