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廬

TDA7345

DIGITALLY CONTROLLED AUDIO PROCESSOR

WITH SURROUND SOUND MATRIX

1 STEREO INPUT

VOLUME CONTROL IN 1.25dB STEP

TREBLE AND BASS CONTROL

THREE SURROUND MODES ARE AVAIL-

ABLE:

鈥?MOVIE, MUSIC AND SIMULATED

FOUR SPEAKER ATTENUATORS:

鈥?4 INDEPENDENT SPEAKERS CONTROL

IN 1.25dB STEPS FOR BALANCE FACILITY

鈥?INDEPENDENT MUTE FUNCTION

ALL FUNCTIONS PROGRAMMABLE VIA SE-

RIAL BUS

DESCRIPTION

The TDA7345 is a volume tone (bass and treble)

balance (Left/Right) processor for quality audio

applications in car radio and Hi-Fi systems.

It reproduces surround sound by using phase

shifters and a signal matrix. Control of all the

functions is accomplished by serial bus.

The AC signal setting is obtained by resistor net-

PIN CONNECTION

SO28

ORDERING NUMBER:

TDA7345D

works and switches combined with operational

amplifiers.

Thanks to the used BIPOLAR/CMOS Technology,

Low Distortion, Low Noise and DC stepping are

obtained.

CREF

PS2

PS1

LP1

HP1

HP2

L-in

BASS-LA

BASS-LB

TREBLE-L

REC_OUT_L

REC_OUT_R

Lout

Rout

1

2

3

4

5

6

7

8

9

10

11

12

13

14

D94AU191A

28

27

26

25

24

23

22

21

20

19

18

17

16

15

Vs

PS3

PS4

LP

REAR IN

REAR OUT

R-in

BASS-RA

BASS-RB

TREBLE-R

DIG GND

SDA

SCL

AGND

November 1999

1/18

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