SA572N datasheet(8/12 Pages) PHILIPS

8 / 12 page

Philips Semiconductors

Product specification

SA572

Programmable analog compandor

1998 Nov 03

–

(7,9)

100k

3.3k

(3,13)

(8)

(16)

(4,12)

(2,14)

(6,10) R6

17.3k

(5,11)

BUFFER

VOUT

VIN

CIN1

CIN2

CIN3

VREF

6.8k

+VB

+VCC

∆G

µF

2.2

µF

2.2

µF

2.2

µF

SR00700

Figure 7. Basic Expandor Schematic

Basic Compressor

Figure 8 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:

OUT

2 @ R1

3 @ VIN(AVG)

(7)

RDC1, RDC2, and CDC form a DC feedback for A1. The output DC

level of A1 is given by

ODC + VREF

)

DC1 ) RDC2

(8)

* V

B @

DC1 ) RDC2

The zener diodes D1 and D2 are used for channel overload

protection.

(7,9)

BUFFER

VREF

6.8k

∆G

RDC1

RDC2

9.1k

CDC

9.1k

17.3k

(6,10)

(5,11)

(2,14)

(4,12)

(8)

(3,13)

3.3k

(16)

CIN3

VCC

µF

2.2

µF

CIN1

VIN

µF

2.2

µF

CIN2

2.2

µF

VOUT

–

SR00701

Figure 8. Basic Compressor Schematic

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