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Part: LMF90CIN
Category:
Analog & Mixed-Signal Processing
-> Filters
Description: 4th-order Elliptic Notch Filter
Company: National Semiconductor Corporation
Datasheet: Download LMF90CIN datasheet File size : 172 kB
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Datasheet text preview:
LMF90 4th-Order Elliptic Notch Filter
December 1994
LMF90 4th-Order Elliptic Notch Filter
General Description
The LMF90 is a fourth-order elliptic notch (band-reject) filter based on switched-capacitor techniques No external components are needed to define the response function The depth of the notch is set using a two-level logic input and the width is programmed using a three-level logic input Two different notch depths and three different ratios of notch width to center frequency may be programmed by connecta b ing these pins to V ground or V Another three-level logic pin sets the ratio of clock frequency to notch frequenA cy n internal crystal oscillator is provided Used in conjunction with a low-cost color TV crystal and the internal clock frequency divider a notch filter can be built with center frequency at 50 Hz 60 Hz 100 Hz 120 Hz 150 Hz or 180 Hz for rejection of power line interference Several LMF90s can be operated from a single crystal An additional input is provided for an externally-generated clock signal F
Y Y
Y
No external components needed to set response characteristics Notch width attenuation and clock-to-center-frequency ratio independently programmable 14 pin 0 3 wide package
Key Specifications
Y Y Y Y Y Y Y Y
f0 Range 0 1 Hz to 30 kHz f0 accuracy over full temperature range (max) 1 5% g 2V to g 7 5V or 4V to 15V Supply voltage range Passband Ripple (typ) 0 25 dB Attenuation at f0 (typ) 39 dB or 48 dB (selectable) fCLK f0 100 1 50 1 or 33 3 1 Notch Bandwidth (typ) 0 127 f0 0 26 f0 or 0 55 f0 Output offset voltage (max) 120 mV
Applications
Y Y Y
eatures
Y
Center frequency set by external clock or on-board clock oscillator
Automatic test equipment Communications Power line interference rejection
Typical Connection
60 Hz Notch Filter
Connection Diagram
Dual-In-Line and Small Outline Packages
TL H 10354 2
Top View Order Number LMF90CCN L L MF90CIWM MF90CCWM LMF90CIJ LMF90CCJ LMF90CIN LMF90CMJ or LMF90CMJ 883 See NS Package Number J14A M14B or N14A
TL H 10354 1
C1995 National Semiconductor Corporation
TL H 10354
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings (Notes 1 3) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications
Soldering Information (Note 4) N Package (Soldering 10 sec ) J Package (Soldering 10 sec ) 260 C 300 C
b 65
a b
b 0 3V to a 16V Supply Voltage (VS e V b V ) b a Voltage at any Input or Output V b0 3V to V a 0 3V Input Current at any Pin (Note 10) 5 mA Package Input Current (Note 10) 20 mA
Storage Temperature Range Junction Temperature
C to a 150 C 150 C
Power Dissipation (Note 5) 1800V 2000V Supply Voltage Range
a
500 mW
ESD Susceptability (Note 6) Pin 9 All Other Pins 4 0V to 15 0V
e a 5V and V
b
Operating Ratings (Notes 2 3) Temperature Range TMIN s TA s TMAX LMF90CCN LMF90CCWM LMF90CCJ 0 C s TA s a 70 C LMF90CIJ LMF90CIWM LMF90CIN b 40 C s TA s a 85 C b 55 C s TA s a 125 C LMF90CMJ LMF90CMJ 883
e b 5V unless otherwise specified Boldface limits apply for
AC Electrical Characteristics The following specifications apply for V TA e TMIN to TMAX all other limits TA e TJ e 25 C
L MF90CCJ LMF90CCN LMF90CCWM Parameter Typ (Note 7) 01 30 10 15 40 3 5 1 0 0 0 3 5 g 1% 0 25 g 1% 00 5 g 1%
g0 2 g0 2 g0 2
LMF90CIJ LMF90CIWM LMF90CIN LMF90CMJ T yp (Note 7) 01 Tested Limit (Note 8) Design Limit (Note 9)
Symbol
Conditions
Tested Limit (Note 8) 30
Design Limit (Note 9)
Units (Limit)
2 Center Frequency Range Clock Frequency Range
b a
fO
30 10 15 40 33 5 g 1 5% 50 25 g 1 5% 100 5 g 1 5%
g0 2 g0 2 g0 2
Hz (Min) kHz (Max) 15 40 33 5 g 1 5% 50 25 g 1 5% 100 5 g 1 5% 0 0 0
g0 2 g0 2 g0 2
fCLK
Pin 6 Pin 6 Pins 4 and 5
Hz (Min) MHz (Max) MHz (Max) (Max) (Max) (Max) dB (Max) dB (Max) dB (Max)
fCLK fO1
Clock-to-CenterFrequency Ratio
fCLK fO2
fCLK fO3 Passband Gain
b a DC and 20 kHz W e D e V R e V fCLK e 167 kHz W e D e R e GND fCLK e 250 kHz a b W e V D e GND R e V fCLK e 500 kHz
WeDeV ReV fCLK e 167 kHz W e D e R e GND fCLK e 250 kHz a b W e V D e GND R e V fCLK e 500 kHz
HON
AC Electrical Characteristics The following specifications apply for V TA e TMIN to TMAX all other limits TA e TJ e 25 C (Continued)
a
e a 5V and Vb e b 5V unless otherwise specified Boldface limits apply for
LMF90CCJ LMF90CCN LMF90CCWM Parameter Typ (Note 7) 0 1275 g 0 0175 0 1275 g 0 0175 265 g 0 025 0 265 g 0 025 0 550 g 0 05
b 30 b 36 5 b 36 5 b 30 b 30 b 30 b 35 b 35 b 35 b 39 b 48 b 48 b 36 b 36 b 42 b 48 b 48
LMF90CIJ LMF90CIWM LMF90CIN LMF90CMJ T yp (Note 7) Tested Limit (Note 8) 0 1275 g 0 0175 0 265 g 0 025 0 550 g 0 05
b 30 b 36 5 b 36 5 b 30 b 30 b 30 b 35 b 35
Symbol
Conditions
Tested Limit (Note 8)
Design Limit (Note 9)
Design Limit (Note 9)
Units (Limit)
PBW 0 0 550 g 0 05
b 30 b 36 5 b 36 5 b 30 b 30 b 30 b 35
b
a
(Max) (Max) (Max) dB (Max) dB (Max) dB (Max) dB (Max) dB (Max) dB (Max) dB (Max) dB (Max)
Ratio of Passband W e D e V R e V Width to Center fCLK e 167 kHz Frequency W e D e R e GND fCLK e 250 kHz a b W e V D e GND R e V e 500 kHz fCLK
b a
AMin1 39 48 48 36 36 42 48 48 b b b b b b b
WeDeV ReV Center Frequency fCLK e 167 kHz AMin2 fO2 W e D e R e GND fCLK e 250 kHz a b AMin3 fO3 W e V D e GND R e V e 500 kHz fCLK
b a
f
O1 Gain at
b
3
Additional Center Frequency Gain Tests at fO1
W e GND D e V R e V fCLK e 167 kHz a b a WeV DeV ReV fCLK e 167 kHz b a W e V D e GND R e V e 167 kHz fCLK W e D e GND R e V a fCLK e 167 kHz W e V a D e GND R e V a fCLK e 167 kHz
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