Philips Semiconductors

Product specification

SA5752

Audio processor – companding, VOX and amplifier section

1997 Nov 07

3

PIN DESCRIPTIONS

PIN NO.

SYMBOL

DESCRIPTION

1

Microphone input

2

Preamplifier gain resistor

3

Rectifier gain resistor

4

Noise cancellation timing capacitor

5

Voice operated transmission output

6

Voice operated transmission threshold resistor

7

GND

Ground

8

Reference voltage

9

Positive supply

10

Expandor timing capacitor

11

Expandor output

12

Expandor input

13

HPDN

Hardware power-down

14

Voice operated transmission control

15

Compressor capacitor 2 DC block

16

Compressor output

17

Compressor timing capacitor 1

18

Compressor capacitor 3 DC block

19

Compressor input

20

Noise cancellation output

BLOCK DIAGRAM

NOISE

COMPANDOR

CANCEL

EXPANDOR

BANDGAP

VOLTAGE REF

VOX

SA5752

BUFFER

PREAMP

12

11

20

19

18

17

16

15

14

13

10

9

8

7

6

5

4

3

2

1

SR00660

Figure 2. Block Diagram