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CXA1797

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

Sony Semiconductor 

CXA1797Q

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

Description

The CXA1797Q is an audio signal processing LSI

designed for use in cassette decks.

Functions include Dolby B-C noise reduction,

recording equalizer amplifier, meter circuit

(logarithmic), bias control circuit, and playback

switching circuit. Serial control of these functions is

possible.

64 pin QFP (Plastic)

Features

• Few external parts

• Serial control of each functions possible

• Dolby B-C noise reduction

• Dolby S noise reduction select switch

• Recording equalizer amplifier

• Recording volume control

• Playback input select switch

• Meter circuit (logarithmic wave detection)

• Bias control circuit (left and right independent)

Applications

Cassette decks

Absolute Maximum Ratings (Ta=25°C)

• Supply voltage

VCC

+12

V

(between VCC and VEE)

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

PD

1.02

W

Recommended Operating Conditions

Supply voltage

VCC ±5.25 to ±6.0 V

Structure

Bipolar silicon monolithic IC

∗This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications

information may be obtained.

∗"Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation.

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by

any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the

operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

—1—

E94X42-TE

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