LMF60 Datasheet | National Semiconductor

Description The LMF60 is a high performance precision 6th-order Butterworth lowpass active filter It is fabricated using National’s LMCMOS process an improved silicon-gate CMOS process specifically designed for analog products Switchedcapacitor techniques eliminate external ponent requirements 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 options either self-clocking (via an external resistor and capacitor) for stand-alone applications or for tighter cutoff frequency control a TTL or CMOS logic patible 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 applications The LMF60 is pin- and functionally-patible with the MF6 but provides improved performance Features Y Y Y Y Y Y Y Y Y Cutoff frequency range of 0 1 Hz to 30 k Hz Cutoff frequency accuracy of g 1 0% maximum Low offset voltage g 100 m V maximum g 5V supply Low clock feedthrough of 10 m Vp- p typical Dynamic range of 88 d B typical Two unmitted op amps available No external ponents 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-patible with the MF6 Applications Y Y Y Y Y Y munication systems Audio filtering Anti-alias filtering Data acquisition noise filtering Instrumentation High-order tracking filters Block and Connection Diagrams All Packages TL H 9294 - 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 - 1 Order Number LMF60CIWM-50 or LMF60CIWM-100...