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廬

TDA7461N

CAR RADIO SIGNAL PROCESSOR

HIGH PERFORMANCE SIGNAL PROCES-

SOR FOR CAR RADIO SYSTEMS

DEVICE INCLUDES AUDIO PROCESSOR,

STEREO DECODER, NOISEBLANKER AND

MULTIPATH DETECTOR

NO EXTERNAL COMPONENTS REQUIRED

FULLY PROGRAMMABLE VIA I

2

C BUS

LOW DISTORTION

LOW NOISE

DESCRIPTION

The TDA7461N is a high performance signal

processor specifically designed for car radio ap-

plications.

The device includes a complete audioprocessor

and a stereo decoder with noiseblanker,

stereoblend and all signal processing functions

necessary for state-of-the-art as well as future car

radio systems.

Switched-capacitors design technique allows to

obtain all these features without external compo-

BLOCK DIAGRAM

SO28

ORDERING NUMBER:

TDA7461ND

nents or adjustments. This means that higher

quality and reliability walks alongside an overall

cost saving.

The CSP is fully programmable by I

2

C bus inter-

face allowing to customize key device parameters

and especially filter characteristics.

The BICMOS process combined with the opti-

mized signal processing assure low noise and

low distortion performances.

ACOUTR

ACOUTL

CDL

7

10

CDG

6

CDR

5

MIXING

STAGE

SMUTE

17

SOFT

MUTE

28

27

1

ACINR

2

ACINL

OUT LR

OUT LF

OUT RR

OUT RF

23

25

22

24

OUT LR

OUT LF

OUT RR

OUT RF

AM

LOUDNESS

VOLUME

TREBLE

BASS

CASS R

CASS L

3

4

INPUT

MULTIPLEXER

+

AUTO ZERO

PHONE

BEEP

DIGITAL CONTROL

18

I C BUS

2

PHONE

9

19

SCL

SDA

PH GND

8

16

15

MUX R

MUX L

MPX

11

80KHz

LP

PILOT

CANCELLATION

DEMODULATOR

+ STEREO ADJUST

+ STEREO BLEND

25KHz

LP

S &H

HIGH

CUT

CONTROL

VS

21

SUPPLY

PLL

PIL

DET

D

MULTIPATH-

DETECTOR

13

MPIN

14

MPOUT

NOISE

BLANKER

PULSE

FORMER

A

12

LEVEL

D97AU646A

20

GND

26

CREF

June 2000

1/31

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