TDA7449L_04 Datasheet, PDF (1/14 Pages) STMicroelectronics – LOW COST DIGITALLY CONTROLLED AUDIO PROCESSOR

TDA7449L
LOW COST
DIGITALLY CONTROLLED AUDIO PROCESSOR
1 FEATURES
■ 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
2 DESCRIPTION
The TDA7449L is a volume control and balance
(Left/Right) processor for quality audio applica-
tions in TV systems.
Figure 2. Block Diagram
Figure 1. Package
DIP20
Table 1. Order Codes
Part Number
TDA7449L
Package
DIP20
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.
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
June 2004
REV. 3
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