NE572 데이터 시트보기 (PDF) - Philips Electronics

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NE572

Programmable analog compandor

Philips Electronics 

Philips Semiconductors RF Communications Products

Programmable analog compandor

Product specification

NE/SA572

Basic Compressor

Figure 5 shows the hook-up of the circuit as a

compressor. The IC is put in the feedback

loop of the OPA A1. The system gain

expression is as follows:

ǒ Ǔ VOUT

VIN

+

1

I1

2

@

R2 @ R1

R3 @ VIN(AVG)

2

(7)

RDC1, RDC2, and CDC form a DC feedback

for A1. The output DC level of A1 is given by

ǒ Ǔ VODC + VREF 1 )

RDC1 ) RDC2

R4

(8)

ǒ Ǔ * VB @

RDC1 ) RDC2

R4

The zener diodes D1 and D2 are used for

channel overload protection.

Basic Compandor System

The above basic compressor and expandor

can be applied to systems such as tape/disc

noise reduction, digital audio, bucket brigade

delay lines. Additional system design

techniques such as bandlimiting, band

splitting, pre-emphasis, de-emphasis and

equalization are easy to incorporate. The IC

is a versatile functional block to achieve a

high performance audio system. Figure 6

shows the system level diagram for

reference.

R4

RDC1

9.1k

C2 .1µF

CDC

10µF

RDC2

9.1k

CIN1

VIN

2.2µF

R3

17.3k

C1

–

A1

+

1k R5

(6,10) VREF

D1

D2

(5,11)

(2,14)

(4,12)

R1 (7,9)

∆G

6.8k

CIN2

2.2µF

BUFFER

CIN3

2.2µF

CR CA

10µF 1µF

3.3k

R2

(3,13)

(8)

VCC (16)

Figure 5. Basic Compressor Schematic

VOUT

October 7, 1987

8

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