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TDA7440D

April 1999

1

FEATURES

■

INPUT MULTIPLEXER

– 4 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

2

DESCRIPTION

The TDA7440D is a volume tone (bass and treble)

balance (Left/Right) processor for quality audio

applications in Hi-Fi 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

TONE CONTROL

DIGITALLY CONTROLLED AUDIO PROCESSOR

Figure 2. Block Diagram

0/30dB

2dB STEP

MUXOUTL

INL

VOLUME

VOLUME

TREBLE

TREBLE

TREBLE(L)

MUXOUTR

INR

TREBLE(R)

BOUT(L)

SPKR ATT

LEFT

LOUT

SCL

SDA

DIG_GND

ROUT

D98AU883

I

100K

100K

100K

100K

G

L-IN1

L-IN2

L-IN3

L-IN4

100K

100K

100K

100K

R-IN1

R-IN2

R-IN3

R-IN4

G

INPUT MULTIPLEXER

+ GAIN

BASS

BIN(L)

BASS

SPKR ATT

RIGHT

BOUT(R)

BIN(R)

SUPPLY

CREF

AGND

27

4

5

6

7

3

2

1

28

21

22

20

26

24

25

10

11

19

12

13

23

8

9

18

14

15

Figure 1. Package

Table 1. Order Codes

Part Number

Package

TDA7440D

SO-28

TDA7440D013TR

Tape & Reel

SO-28

REV. 3