DynamEQ
廬
II
WDRC System
GS3027/GS3028 - DATA SHEET
FEATURES
鈥?dual channel signal processing
鈥?2nd (4th) order state variable filter
鈥?adjustable crossover frequency
鈥?adjustable compression ratio from 1:1 to 4:1
鈥?independent compression ratio adjustment for
low and high frequency band
鈥?adjustable AGC threshold levels
鈥?unique twin average detectors
鈥?handles high input levels
鈥?low THD and IMD distortion
鈥?drives class D Integrated Receivers
鈥?MPO range externally adjustable
STANDARD PACKAGING
Hybrid Typical Dimensions
0.180 in x 0.110 in x 0.080 in
(4.57 mm x 2.79 mm x 2.03 mm)
DEVICE DESCRIPTION
The DynamEQ
廬
II hybrid family is a second generation Wide
Dynamic Range Compression (WDRC) system.
GS3027 (GS3028) Hybrid incorporates 12 dB/oct (24 dB/
oct) filtering and is designed to accommodate CIC and ITC
size requirements.
The gain and frequency response is dependant on the user鈥檚
environment.
Twin averaging detector circuits are optimized for sound
quality during normal listening without sacrificing comfort
during sudden loud inputs.
All input signals to DynamEQ
廬
II, are processed by 2:1
compression before subsequent band splitting.
The 12 dB/oct (24 dB/oct) band split filter ahead of the
expander/compressor circuits allows for independent
compression ratio adjustment (1:1 to 4:1) in high and low
frequency channels.
The gain setting stage is followed by a class D Integrated
Receiver preamplifier stage. Symmetrical peak clipping is
used to achieve MPO adjustment.
V
B
1
C
SAD
9
C5
10n
1M
1M
1:1
13
2:1
16
4:1
10
R
HI
11
R
LO
12
V
REG
8
C1
0碌1
REGULATOR
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
R
TH
1
15
50k
CONTROL
RAGC_IN
R
H
C2
10k
-A
0碌2
48k
C4
-B
-C
0碌1
R
L
Low Frequency
Expander / Compressor
8k4
48k
14 OUT
RECTIFIER
X
V
B
IN
7
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
High Frequency
Expander / Compressor
GND
5
12k
14k
17 MPO
C3
0碌1
6
4
F
OUT
3
B
IN
2
B
OUT
GS3027
(GS3028)
R
茠c
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Patent Pending
FUNCTIONAL BLOCK DIAGRAM
Document No. 521 - 34 - 03
Revision Date: May 1998
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
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