•

CIC suitable package size

•

8:1 compression ratio

•

38 dB maximum system gain,

adjustable over a 38 dB range

•

output compression threshold,

adjustable over 16 dB range

•

designed to drive a class D integrated receiver

•

averaging detector

STANDARD PACKAGING

Hybrid typical dimensions:

0.162 in x 0.094 in x 0.070 in

(4.11 mm x 2.39 mm x 1.78 mm)

C1

0

µ1

C2

0

µ1

C3

0

µ15

OUT

IN

GND

C4

33n

C5

22n

GS3026

12k

48k

REG.

48k

-A

RECT.

B

8:1

COMPRESSION

CONTROL

Rvc

VREG

R

TH

1

2

3

5

6

4

7

GS3026 - DATA SHEET

AGC-O in a CIC Size Hybrid

FEATURES

DESCRIPTION

The GS3026 CIC hybrid features AGC-O capability for low

distortion output limiting and offers a package size suitable

for CIC instruments. The circuit consists of a newly designed

AGC preamplifier and output stage, capable of driving the

class D integrated receiver.

The compression control

circuit varies the current controlled resistance, connected

between the input and output of the AGC preamplifier. The

compression circuit operates with an 8:1 compression

ratio and uses an averaging detector with a time constant

of 270 ms, selected to provide optimal sound quality over

the full range of sound and listening environments. The

actual attack and release times are typically 40 ms and 150

ms respectively when the circuit is fully in the compression

region of operation (measured times will vary depending

on gain and threshold settings).

The system gain and compression control can be adjusted

by the choice of two independent resistors.

Maximum

system gain is 38 dB and it can be adjusted within a 38 dB

range. The output compression threshold can be adjusted

within a 16 dB range.

BLOCK DIAGRAM

All resistors in ohms, all capacitors in farads unless otherwise stated.

Revision Date: July 1998

Document No. 521 - 71 - 02

GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996

Web Site: www.gennum.com

E-mail: hipinfo@gennum.com