QS7785PF/CF

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

3D 2/4-Channel Stereo Surround Synthesizer

OVERVIEW

The QS7785PF/CF is an audio processor IC that

generates 2, 4, 5-channel stereo surround signals

from 2-channel stereo or mono sources using QSur-

round™ technology developed and licensed by

QSound Labs, Inc.

It can create 2-channel left and right surround effect

signal for front speakers, and a rich enhanced sur-

round signal using front speakers and surround

speakers for 4-channel output. It also features a cen-

ter signal output for clear listening of vocal and

speech signals.

FEATURES

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Surround signal output for 2-channel front speak-

ers

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Surround signal output for 4-channel front + sur-

round speakers

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Center speaker output for voice signals

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Parallel and 2 serial interfaces for mode control

supported

(Data and Clock)

• QS7785PF: 3-wire serial interface (Data, Clock

and Strobe)

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5 to 13V analog supply

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4.5 to 5.5V digital supply

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48-pin QFP package

APPLICATIONS

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TV, radio and VCRs

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Car audio

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Multimedia products

PINOUT (Top view)

QS7785PF

QS7785CF

ORDERING INFORMATION

Dolby and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation.

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LIN

BASC2

MSC6

MSC5

MSC4

MSC3

MSC2

MSC1

QXCC1

QXCC2

QXCC3

SLOUT

COUT

CIN

LPC

VREFIN

N.C.

VREFOUT

PSAVE

MUTE

BASS

SUR(SCL)

24

SROUT

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RIN

QS7785PF

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LIN

BASC2

MSC6

MSC5

MSC4

MSC3

MSC2

MSC1

QXCC1

QXCC2

QXCC3

SLOUT

COUT

CIN

LPC

VREFIN

N.C.

VREFOUT

PSAVE

MUTE

BASS

SUR(SCL)

24

SROUT

37

RIN

QS7785CF

Device

Package

QS7785PF

48-pin QFP

QS7785CF

48-pin QFP