TDA7438D STMicroelectronics, TDA7438D Datasheet - Page 5

• Manufacturer Part Number: TDA7438D
• Description: IC PROCESSOR TONE/BALANCE 28SOIC
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of TDA7438D

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3982-5

Figure 4. Test Circuit
3
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 = 44K
The Middle cell has an internal resistor Ri = 25K typical.
Several filter types can be implemented, connecting external components to the Bass/Middle IN and OUT
pins.
Figure 5.
APPLICATION SUGGESTIONS
0.47 F
0.47 F
0.47 F
0.47 F
0.47 F
0.47 F
R-IN1
R-IN2
R-IN3
L-IN1
L-IN2
L-IN3
3
4
5
2
1
28
100K
100K
100K
100K
100K
100K
INPUT MULTIPLEXER
+ GAIN
2dB STEP
0/30dB
MUXOUTR
MUXOUTL
G
G
C
IN
1
6
8
2.2 F
2.2 F
INR
INL
VOLUME
VOLUME
Ri internal
7
9
TREBLE(R)
TREBLE(L)
typical.
5.6nF
5.6nF
TREBLE
TREBLE
R
18
19
D95AU313
2
I
2
CBUS DECODER + LATCHES
18nF
18nF
2.7K
2.7K
17
10
OUT
MIDDLE
MIDDLE
MOUT(R)
MOUT(L)
C
R
R
M
M
2
22nF 100nF
16
11
22nF 100nF
BASS
BASS
5.6K
5.6K
BIN(L)
14
12
BIN(R)
R
R
B
B
100nF
100nF
BOUT(L)
15
13
BOUT(R)
SPKR ATT
SPKR ATT
SUPPLY
RIGHT
LEFT
V
REF
23
CREF
10 F
27
21
22
20
26
24
25
LOUT
SCL
SDA
DIGGND
ROUT
V
AGND
D96AU490A
S
TDA7438
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