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廬

TDA7449

TONE CONTROL

DIGITALLY CONTROLLED AUDIO PROCESSOR

INPUT MULTIPLEXER

- 2 STEREO INPUTS

- SELECTABLE INPUT GAIN FOR OPTIMAL

ADAPTATION TO DIFFERENT SOURCES

ONE STEREO OUTPUT

TREBLE, AND BASS CONTROL IN 2.0dB

STEPS

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 TDA7449 is a volume tone (bass and treble)

balance (Left/Right) processor for quality audio

applications in TV systems.

Selectable input gain is provided. Control of all

the functions is accomplished by serial bus.

BLOCK DIAGRAM

MUXOUTL

10

8

100K

TREBLE(L)

16

DIP20

ORDERING NUMBER:

TDA7449

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.

BIN(L) BOUT(L)

15

R

B

14

L-IN1

L-IN2

9

100K

G

VOLUME

TREBLE

BASS

SPKR ATT

LEFT

5

LOUT

R-IN1

7

100K

0/30dB

2dB STEP

19

I CBUS DECODER + LATCHES

2

20

18

SCL

SDA

DIG_GND

R-IN2

6

100K

G

VOLUME

TREBLE

BASS

SPKR ATT

RIGHT

V

REF

4

ROUT

2

INPUT MULTIPLEXER

+ GAIN

11

MUXOUTR

17

TREBLE(R)

12

SUPPLY

R

B

13

1

CREF

3

V

S

AGND

BIN(R) BOUT(R)

D98AU847A

April 1999

1/17

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