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TDA7439D Fiches technique(PDF) 5 Page - STMicroelectronics

No de pièce TDA7439D
Description  THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
Download  19 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7439D Fiches technique(HTML) 5 Page - STMicroelectronics

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TDA7439
Figure 4. TEST CIRCUIT
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 TDA7439 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
typical.
The Middle cell has an internal resistor Ri = 25K
Ω typical.
Several filter types can be implemented, connecting external components to the Bass/Middle IN and OUT
pins.
Figure 5.
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
DIGGND
ROUT
D95AU339B
I
2CBUS DECODER + LATCHES
5.6nF
2.2
µF
100K
100K
100K
100K
G
L-IN1
L-IN2
L-IN3
L-IN4
0.47
µF
0.47
µF
0.47
µF
0.47
µF
100K
100K
100K
100K
R-IN1
R-IN2
R-IN3
R-IN4
0.47
µF
0.47
µF
0.47
µF
0.47
µF
G
INPUT MULTIPLEXER
+ GAIN
MOUT(L)
BASS
BIN(L)
18nF
22nF
100nF
100nF
2.7K
5.6K
BASS
SPKR ATT
RIGHT
MOUT(R)
BOUT(R)
BIN(R)
5.6nF
18nF
22nF
100nF
100nF
2.7K
5.6K
SUPPLY
10
µF
CREF
AGND
VS
RM
RB
RM
RB
6
11
12
13
14
10
9
8
7
30
1
29
5
3
4
17
18
28
19
20
21
22
2
15
16
27
26
25
23
24
VREF
2.2
µF
Ri internal
C2
OUT
IN
C1
R2
D95AU313


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