GA3206 Просмотр технического описания (PDF) - Gennum -> Semtech
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GA3206 Datasheet PDF : 8 Pages
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Programmable AGC-O
CIC-size Hybrid - GA3206
PRELIMINARY DATA SHEET
FEATURES
• 6 programmable parameters
• 38dB maximum system gain
• 8:1 compression ratio
• output compression threshold, adjustable over
22dB range
• 2nd order active low cut filter adjustable
from 530Hz to 2.0kHz
• low frequency boost
• 1st order high cut filter
• programmable or manual volume control
• multimemory
• averaging detector
thinSTAX™ PACKAGING
Hybrid typical dimensions:
0.195 x 0.110 x 0.070in.
(4.95 x 2.79 x 1.78 mm)
DESCRIPTION
The GA3206 programmable hybrid is composed of an AGC
amplifier and the GP523 controller memory chip. The hybrid
features AGC-O capability for low distortion output limiting
and offers a package size suitable for CIC instruments.
The compression circuit 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 will vary depending on gain and threshold
settings).
The GA3206 features six programmable parameters: VC
adjustment, threshold adjustment, high and low cut filters,
gain trim and low frequency boost.
Four independent memories add to the flexibility of this
hybrid.
The output stage is designed as a preamplifier for the
class␣ D integrated receiver.
The GA3206 hybrid code programmed into the GP523 is “3”.
VREG 4
IN 5
R7
460k
R6
185k
VB
SDA
MS
2
9
10
VB
SDA
MS
R5
92k
VB
REGULATOR
C1
VREG
0µ1
C2
10k
80k
0µ1 C3
FIN
6n8
C4
15n
-F
RF4B
C5
0µ1
800
RF4A
C6 10n
R2
45k5
12k
FOUT
C7
0µ1
AIN
R4
184k
VC
8
SW
R1
64k
C11
0µ15
RVC RTH
CAGC
GA3206
GP523
8:1
COMPRESSION
CONTROL
VB
RECT.
48k
-A
B
BOUT C10
1 OUT
33n
48k
VB
C9
R8
5n
92k
AOUT
C8
22n
RECT
GND
C12
5n
R3
185k
GND2 GND1
All resistors in ohms, all capacitors
in farads, unless otherwise stated.
Revision Date: February 2000
6
7
FOUT
AIN
BLOCK DIAGRAM
3
GND
Document No. 522 - 46 - 00
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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