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廬

TDA7438

THREE BANDS

DIGITALLY CONTROLLED AUDIO PROCESSOR

INPUT MULTIPLEXER

- 3 STEREO INPUTS

- SELECTABLE INPUT GAIN FOR OPTIMAL

ADAPTATION TO DIFFERENT SOURCES

ONE STEREO OUTPUT

TREBLE, MIDDLE 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 TDA7438 is a volume tone (bass, middle and

treble) balance (Left/Right) processor for quality

audio applications in car-radio and Hi-Fi systems.

Selectable input gain is provided. Control of all

the functions is accomplished by serial bus.

BLOCK DIAGRAM

MUXOUTL

L-IN1

3

100K

4

100K

5

100K

G

VOLUME

TREBLE

6

INL

7

TREBLE(L)

18

SO28

DIP28

ORDERING NUMBER:

TDA7438D (SO28)

TDA7438 (DIP28)

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.

MIN(L) MOUT(L) BIN(L)

17

R

M

16

14

R

B

BOUT(L)

15

L-IN2

L-IN3

MIDDLE

BASS

SPKR ATT

LEFT

27

LOUT

R-IN1

2

100K

1

100K

28

0/30dB

2dB STEP

21

I

2

CBUS DECODER + LATCHES

22

20

SCL

SDA

DIG_GND

R-IN2

G

VOLUME

TREBLE

MIDDLE

BASS

SPKR ATT

RIGHT

V

REF

26

ROUT

R-IN3

100K

24

INPUT MULTIPLEXER

+ GAIN

8

MUXOUTR

9

INR

19

TREBLE(R)

10

SUPPLY

R

M

11

12

R

B

13

23

D96AU488A

25

V

S

AGND

MIN(R) MOUT(R) BIN(R)

BOUT(R) CREF

April 1999

1/17

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