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LMF60 Datasheet LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter

Manufacturer: National Semiconductor (now Texas Instruments)

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General 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 component 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 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 applications The LMF60 is pin- and functionally-compatible with the MF6 but provides improved performance

Overview

LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter May 1996 LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass.

Key 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 mVp.
  • 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.

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