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TDA7435

DIGITALLY CONTROLLED AUDIO PROCESSOR

WITH LOUDSPEAKERS EQUALIZER

INPUT

- FOUR HIGH PASS CHANNELS

- TWO AUX STEREO CHANNELS

VOLUME CONTROL IN 1dB STEPS WITH

GAIN UP TO 15dB

SOFT MUTE AND DIRECT MUTE

FOUR AUXILIARY CHANNELS:

- TWO SPEAKERS CONTROL IN 1dB STEP

- TWO CHANNELS MULTIPLEXED WITH

THE HIGH PASS CHANNELS

ALL FUNCTIONS PROGRAMMABLE VIA SE-

RIAL I

2

CBUS

DESCRIPTION

The audioprocessor TDA7435 is an upgrade of

the TDA731X audioprocessor family.

Due to a highly linear signal processing, using

CMOS-switching techniques instead of standard

bipolar multipliers, very low distortion and very

low noise are obtained.

BLOCK DIAGRAM

CSM

22

21

20

19

18

17

16

15

6

7

MUX

HP FILTER

HP FILTER

HP FILTER

SOFT

MUTE

HP FILTER

3

SDA SCL DGND AGND CREF

27

2

SO28

ORDERING NUMBER:

TDA7435D

A second programmable high pass filtering pro-

vides the loudspeakers equalization.

The soft Mute function is implemented andcan be

activated in two ways:

1 Via serial bus (Mute byte, bit D0)

2 Directly on pin 3 through an I/O line of the mi-

crocontroller

Very low DC stepping is obtained by use of a

BICMOS technology.

V

CC

28

12

26

25

24

23

HP FL 1

HP FL 2

HP FR 1

HP FR 2

HP RL 1

HP RL 2

HP RR 1

HP RR 2

AUX 2 IN L

AUX 2 IN R

I C BUS

SUPPLY

OUT REF

10

11

13

14

9

8

5

HP FL OUT

HP FR OUT

HP RL OUT

HP RR OUT

AUX 2 OUT L

AUX 2 OUT R

AUX 1 OUT L

1

AUX 1 IN L

AUX 1 IN R

2

GAIN

0-15dB/1dB step

ATTENUATOR

0/-79dB

ATTENUATOR

0/-79dB

4

AUX 1 OUT R

D96AU437A

November 1996

1/10

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