TDA7449 Datasheet, PDF (1/17 Pages) STMicroelectronics – TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR

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TDA7449
TONE CONTROL
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- 2 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE, AND BASS CONTROL IN 2.0dB
STEPS
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: TDA7449
DESCRIPTION
The TDA7449 is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
applications in TV systems.
Selectable input gain is provided. Control of all
the functions is accomplished by serial bus.
BLOCK DIAGRAM
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
100K
9
L-IN2
100K
MUXOUTL
10
TREBLE(L) BIN(L) BOUT(L)
16
15
14
R_B
G
VOLUME
TREBLE
BASS
SPKR ATT
LEFT
5
LOUT
7
R-IN1
100K
6
R-IN2
100K
0/30dB
2dB STEP
I²CBUS DECODER + LATCHES
19
SCL
20
SDA
18
DIG_GND
G
VOLUME
TREBLE
BASS
SPKR ATT
RIGHT
V_REF
INPUT MULTIPLEXER
+ GAIN
11
MUXOUTR
SUPPLY
R_B
17
12
13
1
TREBLE(R) BIN(R) BOUT(R) CREF
4
ROUT
2
3 ^VS
AGND
D98AU847A
April 1999
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