TDA7449L

LOW COST

DIGITALLY CONTROLLED AUDIO PROCESSOR

INPUT MULTIPLEXER

- 2 STEREO INPUTS

- SELECTABLE INPUT GAIN FOR OPTIMAL

ADAPTATION TO DIFFERENT SOURCES

ONE STEREO OUTPUT

VOLUME CONTROL IN 1.0dB STEPS

TWO SPEAKER ATTENUATORS:

- TWO INDEPENDENT SPEAKER CONTROL

IN 1.0dB STEPS FOR BALANCE FACILITY

- INDEPENDENT MUTE FUNCTION

ALL FUNCTION ARE PROGRAMMABLE VIA

SERIAL BUS

DESCRIPTION

The TDA7449L is a volume control and balance

(Left/Right) processor for quality audio applica-

tions in TV systems.

Selectable input gain is provided. Control of all

the functions is accomplished by serial bus.

The AC signal setting is obtained by resistor net-

works and switches combined with operational

amplifiers.

Thanks to the used BIPOLAR/CMOS Technology,

Low Distortion, Low Noise and DC stepping are

obtained.

April 1999

®

0/30dB

2dB STEP

MUXOUTL

VOLUME

VOLUME

MUXOUTR

SPKR ATT

LEFT

LOUT

SCL

SDA

DIG_GND

ROUT

D98AU868

I

100K

100K

G

L-IN1

L-IN2

100K

100K

R-IN1

R-IN2

G

INPUT MULTIPLEXER

+ GAIN

SPKR ATT

RIGHT

SUPPLY

CREF

AGND

5

8

9

7

6

19

20

18

4

2

3

11

1

10

BLOCK DIAGRAM

ORDERING NUMBER: TDA7449L

DIP20

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