GE570 Datasheet, PDF (1/7 Pages) List of Unclassifed Manufacturers – Dual Channel signal processing

DynamEQ^® II
WDRC IC
GE570 - DATA SHEET
FEATURES
• dual channel signal processing
• 4th order state variable filter
• adjustable crossover frequency
• adjustable compression ratio from 1:1 to 4:1
• independent compression ratio adjustment for
low and high frequency band
• adjustable AGC threshold levels
• unique twin average detectors
• handles high input levels
• low THD and IMD distortion
• drives class D integrated receivers
• MPO range externally adjustable
PACKAGING
• Chip
Au Bump
DEVICE DESCRIPTION
The DynamEQ^® II product family is a second generation Wide
Dynamic Range Compression (WDRC) system.
GE570 incorporates 24 dB/oct filtering and is designed to
accommodate CIC and ITC size requirements.
The gain and frequency response is dependant on the user’s
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^® II, are processed by 2:1
compression before subsequent band splitting.
The 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
18
C_SAD
7
C_FAD
2
1:1A
1:1B
1
6
4:1
5
V_{REG 8 REGULATOR}
1M
SLOW
AVERAGE
DETECTOR
1M
FAST
AVERAGE
DETECTOR
53k5 85k6
R_HI R_LO
43
R_{TH 19}
1
CONTROL
RECTIFIER
X
50k
R
AGC_IN
IN ¹¹
-A
10k
24 dB / Oct
BAND SPLIT
FILTER
GND ⁹
12k
10
12
A_OUT REC
14k
13
R_FC
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
V_B
R_H
High Frequency
Expander / Compressor
48k
-B
-C
20 _OUT
RL
Low Frequency
Expander / Compressor
14 16
17
F_OUT B_IN
B_OUT
48k
8k4
15 _MPO
FUNCTIONAL BLOCK DIAGRAM
Document No. 522 - 07 - 00
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]
Web Site: www.gennum.com E-mail: [e-mail]