Philips Semiconductors

Product data

NE570

Compandor

2

2003 Apr 03

GENERAL DESCRIPTION

The NE570 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 NE570 is well suited for use in cellular radio and radio

communications systems, modems, telephone, and satellite

broadcast/receive audio systems.

FEATURES

DC

APPLICATIONS

PIN CONFIGURATION

RECT_CAP_1

RECT_IN_1

∆G_CELL_IN_1

GND

RECT_CAP_2

RECT_IN_2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

16

15

RES_R3_1

OUTPUT_1

THD_TRIM_1

RES_R3_2

OUTPUT_2

THD_TRIM_2

TOP VIEW

SR02503

NE570D

INV_IN_1

INV_IN_2

∆G_CELL_IN_2

Figure 1. Pin configuration.

ORDERING INFORMATION

Type number

Package

Temperature range

Name

Description

Version

NE570D

SO16

plastic small outline package; 16 leads; body width 7.5 mm

SOT162-1

0

°C to +70 °C

BLOCK DIAGRAM

∆G CELL IN

RECT IN

1.8 V

THD TRIM

RECT CAP

R3

INVERTER IN

OUTPUT

+

–

SR02507

R2 20 k

Ω

R1 10 k

Ω

RECTIFIER

VARIABLE

GAIN

R4

30 k

Ω

R3

20 k

Ω

Figure 2. Block diagram