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LMF60CMJ-50 Datasheet

  • LMF60CMJ-50

  • LMF60 High Performance 6th-Order Switched Capacitor Butterwo...

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LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter
May 1996
LMF60 High Performance
6th-Order Switched Capacitor
Butterworth Lowpass Filter
General Description
The LMF60 is a high performance precision 6th-order But-
terworth lowpass active filter It is fabricated using Nation-
al鈥檚 LMCMOS process an improved silicon-gate CMOS pro-
cess specifically designed for analog products Switched-
capacitor techniques eliminate external component require-
ments and allow a clock-tunable cutoff frequency The ratio
of the clock frequency to the low-pass cutoff frequency is
internally set to 50 1 (LMF60-50) or 100 1 (LMF60-100) A
Schmitt trigger clock input stage allows two clocking op-
tions either self-clocking (via an external resistor and ca-
pacitor) for stand-alone applications or for tighter cutoff fre-
quency control a TTL or CMOS logic compatible clock can
be directly applied The maximally flat passband frequency
response together with a DC gain of 1V V allows cascading
LMF60 sections for higher-order filtering In addition to the
filter two independent CMOS op amps are included on the
die and are useful for any general signal conditioning appli-
cations The LMF60 is pin- and functionally-compatible with
the MF6 but provides improved performance
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Cutoff frequency range of 0 1 Hz to 30 kHz
Cutoff frequency accuracy of
g
1 0% maximum
Low offset voltage
g
100 mV maximum
g
5V supply
Low clock feedthrough of 10 mV
p鈥?p
typical
Dynamic range of 88 dB typical
Two uncommitted op amps available
No external components required
14-pin DIP or 14-pin wide-body S O package
Single Dual Supply Operation
a
4V to
a
14V (
g
2V to
g
7V)
Cutoff frequency set by external or internal clock
Pin-compatible with the MF6
Applications
Y
Y
Y
Y
Y
Y
Communication systems
Audio filtering
Anti-alias filtering
Data acquisition noise filtering
Instrumentation
High-order tracking filters
Block and Connection Diagrams
All Packages
TL H 9294 鈥?2
Top View
Order Number LMF60CMJ-50
(5962-9096 701MCA or
LMF60CMJ50 883)
LMF60CMJ-100 or
(5962-9096 702MCA
or LMF60CMJ100 883)
See NS Package Number J14A
TL H 9294 鈥?1
Order Number LMF60CIWM-50
or LMF60CIWM-100
See NS Package Number M14B
Order Number LMF60CIN-50
or LMF60CIN-100
See NS Package Number N14A
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1996 National Semiconductor Corporation
TL H 9294
RRD-B30M56 Printed in U S A

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