TDA7309 Datasheet, PDF (1/12 Pages) STMicroelectronics – DIGITAL CONTROLLED STEREO AUDIO PROCESSOR WITH LOUDNESS

TDA7309
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
WITH LOUDNESS
INPUT MULTIPLEXER:
3 STEREO INPUTS
RECORD OUTPUT FUNCTION
LOUDNESS FUNCTION
VOLUME CONTROL IN 1dB STEPS
INDEPENDENT LEFT AND RIGHT VOLUME
CONTROL
SOFT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL I²C BUS
DESCRIPTION
The TDA7309 is a control processor with inde-
pendent left and right volume control for quality
audio applications. Selectable external loudness
and soft mute functions are provided.
Control is accomplished by serial I²C bus micro-
processor interface.
The AC signal setting is obtained by resistor net-
BLOCK DIAGRAM
DIP20
SO20
ORDERING NUMBER:
TDA7309
TDA7309D
works and switches combined with operational
amplifiers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and Low DC stepping
are obtained.
3x
2.2µF
17
18
LEFT
INPUTS
20
3x
2.2µF
14
13
RIGHT
INPUTS
11
Recout(L)
1
LOUD(L)
19
100nF
INPUT
SELECTOR
VOLUME +
LOUDNESS
2
MUTE
OUT
LEFT
SERIAL BUS DECODER + LATCHES
VOLUME +
LOUDNESS
SOFT
MUTE
6
DIGGND
4
SDA
5
SCL
8
ADDR
3 CSM
BUS
September 1997
SUPPLY
TDA7309
16
7
VS AGND
15
CREF
10
Recout(R)
22µF
12
LOUD(R)
100nF
MUTE
9
OUT
RIGHT
D93AU045A
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