TDA7449L Datasheet, PDF (1/13 Pages) STMicroelectronics – LOW COST DIGITALLY CONTROLLED AUDIO PROCESSOR

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TDA7449L
LOW COST
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- 2 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
VOLUME CONTROL IN 1.0dB STEPS
TWO SPEAKER ATTENUATORS:
- TWO INDEPENDENT SPEAKER CONTROL
IN 1.0dB STEPS FOR BALANCE FACILITY
- INDEPENDENT MUTE FUNCTION
ALL FUNCTION ARE PROGRAMMABLE VIA
SERIAL BUS
DIP20
ORDERING NUMBER: TDA7449L
DESCRIPTION
The TDA7449L is a volume control and balance
(Left/Right) processor for quality audio applica-
tions in TV systems.
Selectable input gain is provided. Control of all
the functions is accomplished by serial bus.
The AC signal setting is obtained by resistor net-
works and switches combined with operational
amplifiers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and DC stepping are
obtained.
BLOCK DIAGRAM
8
L-IN1
9
L-IN2
100K
100K
MUXOUTL
10
G
VOLUME
SPKR ATT
LEFT
5
LOUT
7
R-IN1
6
R-IN2
100K
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
1
CREF
4
ROUT
2
3 ^VS
AGND
D98AU868
April 1999
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