GS3020 Datasheet, PDF (1/6 Pages) Gennum Corporation – Dynamic Equalizer

DynamEQ^® I
Dynamic Equalizer
FEATURES
• handles high input levels (up to 100 mVRMS)
cleanly
• low THD and IMD distortion
• unique twin average detectors
• dual channel signal processing
• adjustable AGC threshold levels
• highpass filter with adjustable corner frequency
• 2:1 compression of high frequencies
• no external capacitors or resistors required
• 30% smaller by volume than DynamEQ^® I GS3011
STANDARD PACKAGING
• Hybrid Typical Dimensions
0.250 in x 0.115 in x 0.115 in
(6.35 mm x 2.92 mm x 2.92 mm)
V_B
5
C7
2µ2
GS3020 - DATA SHEET
DESCRIPTION
The DynamEQ^® I hybrid is a dynamically adaptive loudness
growth equalizer. Its gain and frequency response is
dependent on the user's environment, and is designed for
level dependant frequency response providing treble
increase at low levels (TILL). The unique twin averaging
detector circuit dramatically reduces pumping effects and
is optimized for mild to moderate hearing loss.
DynamEQ^® I has two signal paths for dual channelprocessing
incorporating 4 amplifying stages ( A, B, C, D ) and the
AGC processing circuit.
Stage A is a highpass channel with 2:1 compression,
Stage B is a wideband unity gain buffer. The sum of the two
paths gives a high frequency boost to low level signals,
which gradually compresses to a flat response at high
input levels. Stage C is used for volume control adjustment,
while stage D is a class A power amplifier with receiver
bias current adjustment.
C6
0µ1
V_{REG 10}
C1
2µ2
REGULATOR
100k
SLOW
AVERAGE
DETECTOR
100k
FAST
AVERAGE
DETECTOR
R_TH 1
R1
CURRENT
REFERENCE
2:1
COMPRESSION
CONTROL
RECTIFIER
68k
VB
C_HP 11
C2
12k
IN ⁹
-A
-C
3n9
C3
0µ1
MGND 8
GND ⁴
R2
-B
50k
50k 50k
50k
C5
C4 ^0µ1
All resistors in ohms, all capacitors in farads unless otherwise stated.
Patent Pending.
0µ1
7
C_IN
FUNCTIONAL BLOCK DIAGRAM
24k
D
3
OUT
121 R_E
1k
515
GS3020
6
C_OUT
Revision Date: May 1998
Document No. 521 - 05 - 04
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]
Web Site: www.gennum.com E-mail: [e-mail]