TDA7439 Datasheet, PDF (5/19 Pages) STMicroelectronics – THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

TDA7439
Figure 4. TEST CIRCUIT
L-IN1 11
0.47µF
L-IN2 12
0.47µF
L-IN3 13
0.47µF
L-IN4 14
0.47µF
100K
100K
100K
100K
R-IN1 10
0.47µF
R-IN2 9
0.47µF
R-IN3 8
0.47µF
R-IN4 7
0.47µF
100K
100K
100K
100K
2.2µF
5.6nF
2.7K
18nF
5.6K
22nF 100nF
100nF
MUXOUTL
INL TREBLE(L)
15
16
27
MOUT(L)
26
25
R_M
BIN(L)
23
R_B
BOUT(L)
24
G
VOLUME
TREBLE
MIDDLE
BASS
SPKR ATT
LEFT
LOUT
6
0/30dB
2dB STEP
I²CBUS DECODER + LATCHES
30
SCL
1
SDA
29
DIGGND
G
VOLUME
TREBLE
MIDDLE
BASS
INPUT MULTIPLEXER
+ GAIN
17
18
28
MUXOUTR
INR TREBLE(R)
R_M
19
20
MOUT(R)
R_B
21
BIN(R)
SPKR ATT
RIGHT
5
ROUT
V_REF
3
SUPPLY
4
22
2
BOUT(R) CREF
V_S
AGND
2.2µF
5.6nF
18nF
2.7K
22nF 100nF
5.6K
100nF
10µF
D95AU339B
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 = 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
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