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CXA1878Q

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

Sony Semiconductor 

CXA1878Q

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

Description

The CXA1878Q is a bipolar IC with a built-in Dolby

B-C type noise reduction system (NR), Dolby S type

select switch, recording/playback equalizer, electronic

volume, and bias control circuit.

Use of this IC in combination with two CXA1417S/Q

completes a Dolby B-C-S type NR stereo system.

64 pin QFP (Plastic)

Features

• Dolby B-C type NR

• Built-in filter required for recording/playback equalizer

amplifiers

• Recording mute function

(requiring only an external time constant circuit to

implement soft mute)

• Fade in/out DC controllable

• NORM/CrO2/METAL tape mode switching function

• NORM/HIGH tape speed switching function

• DC controllable for recording level calibration

(approximately ±6dB variable)

• DC controllable for high frequency equalizer

amplifier gain (approximately ±4dB variable)

• Playback deck A/B select switch

• Recording volume control

• Bias control circuit

• Meter circuit

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage

VCC

17

V

• Operating temperature

Topr –20 to +75 °C

• Storage temperature

Tstg –65 to +150 °C

• Allowable power dissipation PD

1020 mW

Operating Conditions

Supply voltage

(VCC • VEE) ±6.5 to 8.0 V

Applications

Recording/playback equalizer amplifier for stereo

analog cassette decks

(Applicable to ALPS ELECTRIC CO., LTD.

HADKH55 series heads)

∗ These ICs are 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–

E95933A5Z-PK

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