Dual, Continuous, Analog
Highpass Filter
LF580 DATA SHEET
FEATURES
•
only 2 small capacitors required
•
200 to 10 kHz adjustable corner frequency
•
dual 12 dB/Oct Butterworth filter (24 dB/Oct cascaded)
•
1.1 to 3.0 VDC operating range
•
adjustable by a single potentiometer
DESCRIPTION
The LF580 continuous analog filter consists of two second
order (12 dB/oct), tunable (0.2 to 10 kHz) highpass Butterworth
filter blocks.
Tracking and corner frequency of each block are controlled
by a single potentiometer. Cascading the two blocks
together results in a single 24dB/oct high pass filter requiring
only two external 0.001
µF
capacitors for the filter response.
The output noise of each filter stage is typically 5.6µV.
Cascading the two filter blocks together will produce a
noise level which is
V
N
= (V
N1
)
2
+ (V
N2
)
2
Where V
N
is the total output noise of both filters, V
N1
and
V
N2
is the noise of each filter.
To improve the signal-to-noise ratio of the filter the LF580
should be placed after a preamplifier, provided that the
signal level does not exceed the maximum signal capability
of 50mV
RMS
STANDARD PACKAGING
• 8 pin MICROpac
• 8 pin PLID
®
• Chip (66 x 61mils)
V
B
4
8
A
IN
0.001
+
A
_
0.001
+
_
B
5
B
OUT
CONTROL
1.8k
7
6
3
1
A
OUT
B
IN
CONTROL
GND
All resistors in ohms, all capacitors in microfarads unless otherwise stated
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 500 - 73 - 08
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
GENNUM [ GENNUM CORPORATION ]
