TDA7438D Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Lista de partido
TDA7438D Datasheet PDF : 19 Pages
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TDA7438
Figure 4. Test Circuit
L-IN1 3
0.47µF
L-IN2 4
0.47µF
L-IN3 5
0.47µF
100K
100K
100K
2.2µF
5.6nF
2.7K
18nF
5.6K
22nF 100nF
100nF
MUXOUTL
INL TREBLE(L)
6
7
18
MOUT(L)
17
16
RM
BIN(L)
14
RB
BOUT(L)
15
G
VOLUME
TREBLE
MIDDLE
BASS
SPKR ATT
LEFT
LOUT
27
R-IN1 2
0.47µF
R-IN2 1
0.47µF
R-IN3 28
0.47µF
100K
100K
100K
0/30dB
2dB STEP
I2CBUS DECODER + LATCHES
21
SCL
22
SDA
20
DIGGND
G
VOLUME
TREBLE
MIDDLE
BASS
INPUT MULTIPLEXER
+ GAIN
8
9
19
MUXOUTR
INR TREBLE(R)
RM
10
11
MOUT(R)
RB
12
BIN(R)
SPKR ATT
RIGHT
26
ROUT
VREF
24
SUPPLY
25
13
23
BOUT(R) CREF
VS
AGND
2.2µF
5.6nF
18nF
2.7K
22nF 100nF
5.6K
100nF
10µF
D96AU490A
3 APPLICATION SUGGESTIONS
The first and the last stages are volume control blocks. The control range is 0 to -47dB (mute) for the first
one, 0 to -79dB (mute) for the last one.
Both of them have 1dB step resolution. The very high resolution allows the implementation of systems free
from any noisy acoustical effect. The TDA7438 audioprocessor provides 3 bands tones control.
3.1 Bass, Middle Stages
The Bass and the middle cells have the same structure.
The Bass cell has an internal resistor Ri = 44KΩ typical.
The Middle cell has an internal resistor Ri = 25KΩ typical.
Several filter types can be implemented, connecting external components to the Bass/Middle IN and OUT
pins.
Figure 5.
Ri internal
IN
OUT
C1
C2
R2
D95AU313
5/19
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