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 I

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 I

processor interface.

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 Low DC stepping

are obtained.

September 1997

17

18

13

14

11

INPUT

SELECTOR

LEFT

INPUTS

RIGHT

INPUTS

SUPPLY

16

7

15

VOLUME +

LOUDNESS

SOFT

MUTE

19

LOUD(L)

22

µF

CREF

12

LOUD(R)

MUTE

MUTE

6

4

5

8

9

2

OUT

LEFT

SCL

SDA

DIGGND

OUT

RIGHT

ADDR

D93AU045A

BUS

SERIAL BUS DECODER + LATCHES

20

3 x

2.2

µF

3 x

2.2

µF

VOLUME +

LOUDNESS

AGND

VS

3

CSM

100nF

100nF

TDA7309

10

Recout(R)

1

Recout(L)

BLOCK DIAGRAM

DIP20

SO20

ORDERING NUMBER:

TDA7309

TDA7309D

1/12