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TDA7439

THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

STMicroelectronics 

®

TDA7439

THREE BANDS

DIGITALLY CONTROLLED AUDIO PROCESSOR

INPUT MULTIPLEXER

- 4 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

SDIP30

DIP28

SO28

ORDERING NUMBERS: TDA7439 (SDIP30)

TDA7439B (DIP28)

TDA7439D (SO28)

DESCRIPTION

The TDA7439 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 (TDA7439)

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

11

L-IN1

12

L-IN2

13

L-IN3

14

L-IN4

100K

100K

100K

100K

10

R-IN1

9

R-IN2

8

R-IN3

7

R-IN4

100K

100K

100K

100K

MUXOUTL INL

15

16

TREBLE(L) MIN(L) MOUT(L) BIN(L) BOUT(L)

27

26

25 23

24

RM

RB

G

VOLUME

TREBLE

MIDDLE

BASS

SPKR ATT

LEFT

6

LOUT

0/30dB

2dB STEP

I2CBUS DECODER + LATCHES

30

SCL

1

SDA

29

DIG_GND

G

VOLUME

TREBLE

MIDDLE

BASS

SPKR ATT

RIGHT

VREF

INPUT MULTIPLEXER

+ GAIN

17

18

MUXOUTR INR

SUPPLY

RM

RB

28

19

20 21

22

2

TREBLE(R) MIN(R) MOUT(R) BIN(R) BOUT(R) CREF

5

ROUT

3

4 VS

AGND

D95AU342B

April 1999

1/19

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