TDA7449L Datasheet, PDF (4/13 Pages) STMicroelectronics – LOW COST DIGITALLY CONTROLLED AUDIO PROCESSOR

TDA7449L
ELECTRICAL CHARACTERISTICS (continued.)
Symbol
Parameter
BUS INPUT
V_IL
Input Low Voltage
V_IH
Input High Voltage
IIN
Input Current
V_O
Output Voltage SDA
Acknowledge
Test Condition
VIN = 0.4V
IO = 1.6mA
Min. Typ. Max. Unit
1
V
3
V
-5
5
µA
0.4
0.8
V
TEST CIRCUIT
L-IN1 8
0.47µF
100K
L-IN2 9
0.47µF
100K
MUXOUTL
10
G
VOLUME
SPKR ATT
LEFT
5
LOUT
R-IN1 7
0.47µF
100K
R-IN2 6
0.47µF
100K
0/30dB
2dB STEP
I²CBUS DECODER + LATCHES
19
SCL
20
SDA
18
DIG_GND
G
VOLUME
INPUT MULTIPLEXER
+ GAIN
11
MUXOUTR
SPKR ATT
RIGHT
V_REF
SUPPLY
4
ROUT
2
3 ^VS
AGND
1
CREF
10µF
D98AU870
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 TDA7449L audioprocessor provides 2 bands
tones control.
CREF
The suggested 10µF reference capacitor (CREF)
value can be reduced to 4.7µF if the application
requires faster power ON.
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