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TDA7438 Fiches technique(PDF) 1 Page - STMicroelectronics

No de pièce TDA7438
Description  THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
PDF  17 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7438 Fiches technique(HTML) 1 Page - STMicroelectronics

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TDA7438
THREE BANDS
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- 3 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE, MIDDLE 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
DESCRIPTION
The TDA7438 is a volume tone (bass, middle and
treble) balance (Left/Right) processor for quality
audio applications in car-radio and 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.
April 1999
®
0/30dB
2dB STEP
MUXOUTL
INL
VOLUME
VOLUME
TREBLE
TREBLE
TREBLE(L)
MIDDLE
MIDDLE
MUXOUTR
INR
TREBLE(R)
BOUT(L)
SPKR ATT
LEFT
LOUT
SCL
SDA
DIG_GND
ROUT
D96AU488A
I
2CBUS DECODER + LATCHES
100K
100K
100K
G
L-IN1
L-IN2
L-IN3
100K
100K
100K
R-IN1
R-IN2
R-IN3
G
INPUT MULTIPLEXER
+ GAIN
MOUT(L)
BASS
BIN(L)
BASS
SPKR ATT
RIGHT
MIN(R) MOUT(R)
BOUT(R)
BIN(R)
SUPPLY
CREF
AGND
VS
MIN(L)
27
3
4
5
2
1
28
21
22
20
26
24
25
8
9
19
10
11
12
13
23
6
7
18
17
16
14
15
R
M
R
B
RM
RB
V
REF
BLOCK DIAGRAM
ORDERING NUMBER: TDA7438D (SO28)
TDA7438 (DIP28)
SO28
DIP28
1/17


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