Philips Semiconductors

Product specification

SA571

Compandor

2

1997 Aug 14

853-0812 18285

DESCRIPTION

The SA571 is a versatile low cost dual gain control circuit in which

either channel may be used as a dynamic range compressor or

expandor. Each channel has a full-wave rectifier to detect the

average value of the signal, a linerarized temperature-compensated

variable gain cell, and an operational amplifier.

The SA571 is well suited for use in cellular radio and radio

communications systems, modems, telephone, and satellite

broadcast/receive audio systems.

FEATURES

PIN CONFIGURATION

RECT CAP 1

RECT IN 1

AG CELL IN 1

GND

RECT CAP 2

AG CELL IN 2

RECT IN 2

VCC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

16

15

INV. IN 1

RES. R3 1

OUTPUT 1

THD TRIM 1

INV. IN 2

RES. R3 2

OUTPUT 2

THD TRIM 2

TOP VIEW

NOTE:

1. SOL - Released in Large SO Package Only.

SR00675

Figure 1. Pin Configuration

APPLICATIONS

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

16-Pin Plastic Small Outline Large (SOL)

-40 to +85

°C

SA571D

SOT162-1

16-Pin Plastic Dual In-Line Package (DIP)

-40 to +85

°C

SA571N

SOT38-4

BLOCK DIAGRAM

VARIABLE

GAIN

∆G IN

RECT IN

VREF

THD TRIM

R2 20k

R1 10k

RECT CAP

R3

R3 20k

R4 30k

1.8V

INVERTER IN

OUTPUT

+

–

RECTIFIER

SR00676

Figure 2. Block Diagram