SA571_97 Просмотр технического описания (PDF) - Philips Electronics

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SA571_97

Compandor

Philips Electronics 

Philips Semiconductors

Compandor

Product specification

SA571

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

• Complete compressor and expandor in one IChip

• Temperature compensated

• Greater than 110dB dynamic range

• Operates down to 6VDC

• System levels adjustable with external components

• Distortion may be trimmed out

• Dynamic noise reduction systems

• Voltage-controlled amplifier

ORDERING INFORMATION

DESCRIPTION

16-Pin Plastic Small Outline Large (SOL)

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

PIN CONFIGURATION

D, and N Packages1

RECT CAP 1 1

RECT IN 1 2

AG CELL IN 1 3

GND 4

INV. IN 1 5

RES. R3 1 6

OUTPUT 1 7

THD TRIM 1 8

16 RECT CAP 2

15 RECT IN 2

14 AG CELL IN 2

13 VCC

12 INV. IN 2

11 RES. R3 2

10 OUTPUT 2

9 THD TRIM 2

TOP VIEW

NOTE:

1. SOL - Released in Large SO Package Only.

Figure 1. Pin Configuration

SR00675

APPLICATIONS

• Cellular radio

• High level limiter

• Low level expandor—noise gate

• Dynamic filters

• CD Player

TEMPERATURE RANGE

-40 to +85°C

-40 to +85°C

ORDER CODE

SA571D

SA571N

DWG #

SOT162-1

SOT38-4

BLOCK DIAGRAM

∆G IN

RECT IN

THD TRIM

R2 20k

VARIABLE

GAIN

R1 10k

RECTIFIER

R3

INVERTER IN

R3 20k

–

VREF

R4 30k 1.8V

+

RECT CAP

Figure 2. Block Diagram

OUTPUT

SR00676

1997 Aug 14

2

853-0812 18285

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