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廬

TDA7437

DIGITALLY CONTROLLED AUDIO PROCESSOR

INPUT MULTIPLEXER

- FOUR STEREO, ONE MONO INPUT, AND

ONE DIFFERENTIAL INPUT

- SELECTABLE INPUT GAIN FOR OPTIMAL

ADAPTATION TO DIFFERENT SOURCES

FULLY

PROGRAMMABLE

LOUDNESS

FUNCTION

VOLUME CONTROL IN 1dB STEPS INCLUD-

ING GAIN UP TO 16dB

ZERO CROSSING MUTE, SOFT MUTE AND

DIRECT MUTE

BASS AND TREBLE CONTROL

FOUR SPEAKER ATTENUATORS

- FOUR INDEPENDENT SPEAKERS

CONTROL IN 1dB STEPS FOR

BALANCE AND FADER FACILITIES

PAUSE

DETECTOR

PROGRAMMABLE

THRESHOLD

ALL FUNCTIONS PROGRAMMABLE VIA SE-

RIAL I

2

CBUS

DESCRIPTION

The audioprocessor TDA7437 is an upgrade of

the TDA731X audioprocessor family.

PIN CONNECTION

PQFP44 and TQFP44

ORDERING NUMBERS:

TDA7437 (PQFP44)

TDA7437T (TQFP44)

Due to a highly linear signal processing, using

CMOS-switching techniques instead of standard

bipolar multipliers, very low distortion and very

low noise are obtained. Several new features like

softmute, and zero-crossing mute are imple-

mented.

The soft Mute function can be activated in two

ways:

1 Via serial bus (Mute byte, bit D0)

2 Directly on pin 28 through an I/O line of the

microcontroller

Very low DC stepping is obtained by use of a

BICMOS technology.

44 43 42 41 40 39 38 37 36 35 34

TREB_R

IN_R

MUXOUT_R

LOUD_R

DIFFGND_R

DIFF_R

STEREO4_R

STEREO1_R

STEREO2_R

STEREO3_R

MONO

1

2

3

4

5

6

7

8

9

10

11

12 13 14 15 16 17 18 19 20 21 22

DIFFGND_L

STEREO4_L

STEREO1_L

STEREO2_L

STEREO3_L

MUXOUT_L

LOUD_L

DIFF_L

MID_LI

CSM

IN_L

33

32

31

30

29

28

27

26

25

24

23

OUT_RF

OUT_LR

MID_RI

MID_RO

OUT_RR

SMEXT

BASS_RO

BASS_RI

BASS_LO

BASS_LI

MID_LO

OUT_LF

D96AU435A

TREB-L

PAUSE

DGND

AGND

DVDD

ADDR

AVDD

CREF

SDA

SCL

December 1999

1/23

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