TDA7439DS Datasheet, PDF (1/16 Pages) STMicroelectronics – THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

®
TDA7439DS
THREE BANDS
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- 4 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE, MIDDLE 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
DESCRIPTION
The TDA7439DS is a volume tone (bass, middle
and treble) balance (Left/Right) processor for
quality audio applications in car-radio and Hi-Fi
systems.
Selectable input gain is provided. Control of all
SO28
ORDERING NUMBERS: TDA7439DS
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
4
L-IN1
5
L-IN2
6
L-IN3
7
L-IN4
100K
100K
100K
100K
3
R-IN1
2
R-IN2
1
R-IN3
28
R-IN4
100K
100K
100K
100K
MUXOUTL
8
TREBLE(L) MIN(L) MOUT(L) BIN(L) BOUT(L)
18
17
16 14
15
R_M
R_B
SPKR ATT
27
G
VOLUME
TREBLE
MIDDLE
BASS
LEFT
LOUT
0/30dB
2dB STEP
I²CBUS DECODER + LATCHES
21
SCL
22
SDA
20
DIG_GND
G
VOLUME
INPUT MULTIPLEXER
+ GAIN
9
MUXOUTR
TREBLE
MIDDLE
BASS
SPKR ATT
RIGHT
V_REF
SUPPLY
R_M
R_B
19
10
11 12
13
23
TREBLE(R) MIN(R) MOUT(R) BIN(R) BOUT(R) CREF
26
ROUT
24
25 ^VS
AGND
D97AU621
April 1999
1/16