Samsung HT-DM150 Manual page 76

3. TDA7449L
[
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
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-
BLOCK DIAGRAM
L-IN1
L-IN2
R-IN1
R-IN2
Samsung Electronics
DIGITALLY CONTROLLED AUDIO PROCESSOR
8
100K
9
100K
0/30dB
7
2dB STEP
100K
6
100K
INPUT MULTIPLEXER MULTIPLEXER
+ GAIN
ORDERING NUMBER: TDA7449L
works and switches combined with operational
amplifiers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and DC stepping are
obtained.
MUXOUTL
10
G VOLUME
2
I CBUS DECODER + LATCHES
G VOLUME
11
MUXOUTR
TDA7449L
LOW COST
DIP20
5
SPKR ATT
LOUT
LEFT
19
SCL
20
SDA
18
DIG_GND
4
SPKR ATT
ROUT
RIGHT
V
REF REF
2
V
S
SUPPLY
3
AGND
1
D98AU868
CREF
8-3