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廬

TDA7400

ADVANCED CAR SIGNAL PROCESSOR

FULLY INTEGRATED SIGNAL PROCESSOR

OPTIMIZED FOR CAR RADIO APPLICA-

TIONS

FULLY PROGRAMMABLE BY I

2

C BUS

INCLUDES AUDIOPROCESSOR, STEREO -

DECODER WITH NOISE BLANKER AND

MULTIPATH DETECTOR

PROGRAMMABLE ROLL-OFF COMPENSA-

TION

NO EXTERNAL COMPONENTS

DESCRIPTION

The TDA7400D is the newcomer of the CSP fam-

ily introduced by TDA7460/61. It uses the same

innovative concepts and design technologies

2

al-

lowing fully software programmability through I C

bus and overall cost optimisation for the system

designer.

The device includes an audioprocessor with con-

figurable inputs and absence of external compo-

nents for filter settings, a last generation

stereodecoder with multipath detector and a so-

BLOCK DIAGRAM

ACOUTR

ACOUTL

TQFP44

ORDERING NUMBER:

TDA7400

phisticated stereoblend and noise cancellation

circuitry.

Strength points of the CSP approach are flexibility

and overall cost/room saving in the application,

combined with high performances.

AUDIO PROCESSOR PART

ACINRR

ACINRF

CDL CDGND CDR

5

3

1

SMUTE

22

34

35

39

38

40

ACINLR

37

OUT LR

30

32

29

31

OUT LR

OUT LF

OUT RR

OUT RF

2

CDROUT

CDLOUT

AM

TAPE R

TAPE L

PH+

PH-

8

7

4

10

44

43

INPUT

MULTIPLEXER

+

AUTO ZERO

MUXR

MUXL

FM_R

FM_L

DEMODULATOR

+ STEREO ADJUST

+ STEREO BLEND

VOLUME

SOFT

MUTE

TREBLE

BASS

ACINLF

OUT LF

OUT RR

OUT RF

23

DIGITAL CONTROL

I C BUS

2

24

19

18

SCL

SDA

MUX R

MUX L

12

MPX

80KHz

LP

PILOT

CANCELLATION

25KHz

LP

S&H

HIGH

CUT

CONTROL

21

QUAL.

27

V

S

V

REF

41

SUPPLY

PLL

PIL

DET

D

MULTIPATH-

DETECTOR

15

MPIN

16

MPOUT

NOISE

BLANKER

PULSE

FORMER

A

14

LEVEL

D98AU852B

QUAL

26

GND

42

CREF

July 1999

1/28

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