Philips Semiconductors RF Communications Products

Product specification

NE/SA577

Unity gain level programmable low power compandor

December 15, 1993

4

BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT

1

2

3

4

5

6

7

8

9

10

14

13

12

11

VREF

VCC

GND

COMPIN

BANDGAP

IREF

Σ

Σ

∆G

∆G

EXPANDOR

COMPRESSOR

GAINCELL

GAINCELL

RECTIFIER

VCC

GND

COMPCAP2

COMPCAP1

GCELLIN

COMPOUT

RECTIN

VREF

EXPOUT

EXPCAP

RECTIN

EXPIN

RECTIFIER

C3

C1

R1*

C2

R2*

C4

10

µF

2.2

µF

10

µF

10

µF

C8

C7

C6

R3*

C5

+

+

+

+

+

+

+

10

µF

2.2

µF

10

µF

C9

+

10

µF

2.2

µF

+

*R1, R2 and R3 are 1% resistors.

30k

30k

10k

10k

10k

10k

10k

5k

10k

8.6k