GS3044 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – AGC-O with Active Low Cut Filter in a CIC Size Hybrid

AGC-O with Active Low Cut Filter
in a CIC Size Hybrid - GS3044
DATA SHEET
FEATURES
• CIC suitable package size
• low distortion compression limiting
• 38dB maximum system gain, adjustable over a
38dB range
• output compression threshold, adjustable over
16dB range
• 2nd order active low cut filter adjustable from 530Hz
to 2.0kHz
• designed to drive a class D integrated receiver
• averaging detector
• flexibility to add high cut filter
STANDARD PACKAGING
Hybrid typical dimensions:
0.180 x 0.110 x 0.070 in.
(4.57 x 2.79 x 1.78 mm)
DESCRIPTION
The GS3044 CIC hybrid features AGC-O capability for low
distortion output limiting with an active low cut filter in a
package size suitable for CIC instruments. The circuit consists
of an AGC preamplifier and output stage, capable of driving
a class D integrated receiver. The compression control circuit,
connected between the input and output of the AGC
preamplifier, varies the current controlled resistance. It
operates with an 8:1 compression ratio and uses an averaging
detector with a time constant of 270ms, selected to provide
optimal sound quality over a full range of sound and listening
environments. The actual attack and release times are typically
40ms and 150ms respectively when the circuit is fully in the
compression region of operation (measured times vary
depending on gain and threshold settings).
The system gain, compression control and filter corner
frequency can be adjusted by choosing three independent
resistors or 100k trimmers. Maximum system gain is 38dB. It
can be adjusted within a 38dB range. The output compression
threshold can be adjusted within a 16dB range. The filter's
corner frequency can be adjusted from 530Hz to 2kHz.
V_B
R_VC R_TH
1
2
3
C7
0µ15
GS3044
7
V_{REG C2}
0µ1
REGULATOR
80k
C1
C3
6
-F
IN ¹⁵ⁿ
6n8
10k
12k
C4
10n
800
8:1
COMPRESSION
CONTROL
RECT.
VB
48k
C8
-A
B
10
48k ^{33n OUT}
5
R_HP
All resistors in ohms, all capacitors
in farad, unless otherwidse stated.
C5
0µ1
R1 = 0
8
9
C6
22n
4
F_OUT
A_IN
GND
Note: R1 can be desoldered from hybrid to break connection between F_OUT and A_IN
Revision Date: March 2000
BLOCK DIAGRAM
Document No. 521 - 90 - 02
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]
Web Site: www.gennum.com E-mail: [e-mail]