TDA7437 Datasheet, PDF (1/23 Pages) STMicroelectronics – DIGITALLY CONTROLLED AUDIO PROCESSOR

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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 I² 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.
December 1999
TREB_R
IN_R
MUXOUT_R
LOUD_R
DIFFGND_R
DIFF_R
STEREO4_R
STEREO1_R
STEREO2_R
STEREO3_R
MONO
44 43 42 41 40 39 38 37 36 35 34
1
33
2
32
3
31
4
30
5
29
6
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
OUT_RF
OUT_LR
MID_RI
MID_RO
OUT_RR
SMEXT
BASS_RO
BASS_RI
BASS_LO
BASS_LI
MID_LO
D96AU435A
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