GA3202 Просмотр технического описания (PDF) - Gennum -> Semtech
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GA3202 Datasheet PDF : 8 Pages
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DynamEQ®II
WDRC System - GA3202
PRELIMINARY DATA SHEET
FEATURES
• dual channel signal processing
• reflowable hybrid
• 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
• > 95dB dynamic range
• low THD and IMD distortion
• drives class D integrated receivers
• MPO range externally adjustable
thinSTAX™ PACKAGING
Hybrid Typical Dimensions:
0.190 x 0.105 x 0.050in.
(4.83 x 2.67 x 1.27mm)
DEVICE DESCRIPTION
The DynamEQ®II hybrid family is a second generation Wide
Dynamic Range Compression (WDRC) system.
The small hybrid design makes it particularly suitable for
CIC applications. GA3202 hybrid incorporates 24dB/oct
filtering. 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
adjustments (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.
The GA3202 is designed as a CIC alternative to GS3032,
GR3032 and GS3028 with MPO adjustment range modifications.
VREG 3
RTH 10
IN 4
GND 5
R2
12k
37k
R1
VB
1:1
2:1
4:1 RHI RLO
8
1
15
14
13 2
GA3202
C8
C5
C14
C6
8n5
8n
7n4
83n
VBAT
REGULATOR
C1 VREG
81n
CFAD
1M
FAST
AVERAGE
DETECTOR
CSAD VREF
2M
SLOW
AVERAGE
DETECTOR
1:1
2:1
4:1
85k6 42k8
RHI RLO
1
CONTROL
RECT.
RTH 3k3
X
VB
RAGC_IN
C2
81n IN 10k
GND
24 dB / Oct
-A
BAND SPLIT
FILTER
12k
AOUT REC
13k1
RFC
RH
High Frequency
Exp'der / Comp'r
RL
Low Frequency
Exp'der / Comp'r
FOUT BIN
-B
BOUT
48k
OUT C4
-C
92n
48k
11k
MPO
C3
C7
80n
0µ14
7 OUT
6 MPO
R4
100k
All resistors in ohms, all capacitors in farads, unless otherwise stated.
Patent Pending
R3
198k
9
RƒC
11
12
BIN
BOUT
Revision Date: September 1999
BLOCK DIAGRAM
Document No. 521 - 91 - 03
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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