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
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Operating Temperature Range
Storage Temperature Range
VALUE/UNITS
5 V DC
-10°C to 50° C
-40°C to 100° C
V
B
PIN CONNECTION
TOP VIEW
4
5
B
B
A
1
8
A
OUT
IN
OUT
IN
CONTROL
N/C
GND
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage V
B
= 1.3 V
Parameter
Insertion Loss
Current Drain
Corner Frequency
Distortion
Ouput Noise
Supply Rejection
Symbol
Conditions
V
IN
=1 V
RMS
Note 1
Min
-
200
Typ
2
280
Max
3
370
1900
5
10
56
Units
dB
µA
Hz
%
µV
dB
I
T
f
C
THD
R
CNT
= 100 kΩ
V
IN
=1 V
RMS
V
IN
=1.25 V
RMS
Note 3
Note 2
1300 1650
-
-
-
2
8
45
SR
V
B
= 3.0V
DC
Note 4
All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column
Notes 1:
Insertion Loss = 20 Log(V
OUT
/V
IN
)-12
2:
a) measure output voltage V
OUT1
(R
CNT
=100kΩ)
b) measure output voltage V
OUT2
(R
CNT
=10.274kΩ)
f
C
= 1000 x 2
(VOUT1
/
VOUT2)
3:
Output Noise = V
OUT
/100, filter bandwidth 200Hz to 10kHz at 12dB/Oct
4:
V
B
modulated with 1V
RMS
at 1 kHz
Supply Rejection = 20 Log (V
OUT
)-40
0.001
R
B
=4.7
V
B
=1.3 VDC
+15 V
DC
7
1.82k
150
0.001
6
LF580
3
4
1.0
8
ATTENUATOR
28dB
5
1
+ IC1
40.0 dB
_
-15 V
DC
V
OUT
82.1
V
IN
R
L
=10k
R
CNT
=100k
100k
1000
10
All resistors in ohms, all capacitors in microfarads unless otherwise stated in conditions column
Fig. 1 Test Circuit
500 - 73 - 08
2
4
0.001 0.001
2
1
1.8k
7
5
8
6
3
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 2 Functional Schematic
1.3 VDC
1
/ GL504
2
6
4
1
/ GL504
2
7
1.0
R
MIC
0.001
8
0.001
+
_
A
0.001
+
_
B
5
R
PULL
0.1
3
- B
8
0.033
EP3075
1.0
0.22
5
- A
R
CLIP
CONTROL
47k
1.8k
4
LF580
7
6
3
1
1
2
0.001
100k
1.5nF
R
VC
R
CNT
10k
R
MPO
10k
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 3 GL504-LF580 Application Circuit
3
500 - 73 - 08
2
1
0
R
CNT
=100K
R
CNT
=10K
R
CNT
=1K
24
22
20
18
16
RELATIVE OUTPUT (dB)
-1
-2
THD (%)
1K
10K
100K
-3
-4
-5
-6
-7
-8
-9
-10
100
14
12
10
8
6
4
2
0
10
20
30
40
50
60
70
80
90
100
FREQUENCY (Hz)
INPUT (mV
DC
)
Fig. 4 Frequency Response at Various
R
CNT
Values
Fig. 5 Total Harmonic Distortion vs Input
Level (measured at Pin 7)
20K
10K
400
380
CORNER FREQUENCY (Hz)
CURRENT DRAIN (µA)
360
340
320
300
280
1K
100
10
100
1K
10K
100K
260
100
10000
CONTROL RESISTANCE R
CNT
(Ω)
CORNER FREQUENCY (Hz)
Fig. 6 Corner Frequency vs Control Resistance
Fig. 7 Current Drain vs Corner Frequency
GENNUM CORPORATION
MAILING ADDRESS:
P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814
SHIPPING ADDRESS:
970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
DOCUMENT IDENTIFICATION:
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
REVISION NOTES:
Changes to standard packaging information
GENNUM JAPAN CORPORATION
C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081,
Japan
Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright October 1987 Gennum Corporation.
All rights reserved.
Printed in Canada.
500 - 73 - 08
4
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