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參數(shù)資料
| 型號： | GR581PLID |
| 英文描述： | Analog Filter |
| 中文描述： | 模擬濾波器 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大?。?/td> | 80K |
| 代理商： | GR581PLID |
DESCRIPTION
The GR581 is a level-sensitive, adaptive highpass filter
comprised of a current controlled highpass filter, a half- wave
rectifier, a voltage regulator for microphone bias and a separate
preamplifier.
The internal rectifier senses the long term average signal level
and controls the filter response by setting the control current
of the filter. The rectifier sensitivity, with respect to the input
signal, can be increased by placing the internal preamplifier
(A) before the filter section of the GR581. The preamplifier has
an internal 265 k
feedback resistor from its input to output, to
facilitate in setting the gain.
An increase of 20 dB above the rectifier threshold will
automatically increase the corner frequency one decade
above the initial corner frequency. The filter will only allow an
increase in corner frequency of one decade, regardless of
further increases in the input signal level.
It is recommended that the attack and release times be set to
30 ms and 90 ms respectively. The average time period of a
speech frame is about 15 ms which is not long enough to
activate the filter, however long term average noise, which can
have time periods greater than 30 ms, will activate the filter
(providing that the amplitude is above the rectifier threshold).
The GR581 is an improved version of the LS581adaptive high
pass filter and has an identical pinout.
GR581 DATA SHEET
All resistors in ohms, all capacitors
in farads unless otherwise stated.
5
9
8
3
7
4
RECTIFIER
VREG
10
2
1
6
265k
-A
+
-
B
VREG
A IN
B OUT
10k
VB
A OUT
CA
CB
RECT IN
RECTCAP
GND
Adaptive Highpass Filter
with Independent Gain Block
FEATURES
unity gain 12 dB/oct. highpass Butterworth filter
adaptive frequency range from 200 Hz to 2 kHz
rectifier threshold set to 82 dBSPL (adjustable)
low noise, typically 2.6
μ
V
300
μ
A typical current drain
operates from 1.1 to 3 VDC
preamplifier with 56 dB open loop gain
PACKAGING
10 pin MICROpac
10 pin PLID
Chip (73 x 59 mils)
FUNCTIONAL BLOCK DIAGRAM
Document No. 520 - 60 - 05
Revision Date: January 2001
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2814
Gennum Japan Corporation: C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan tel. (03) 3334-7700 fax:(03) 3247-8839
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