MF4 4th Order Switched Capacitor Butterworth Lowpass Filter July 1999 MF4 4th Order Switched Capacitor Butterworth Lowpass Filter General Description The MF4 is a versatile, easy to use, precision 4th order Butterworth low-pass filter.
Switched-capacitor 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 to 1.
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 an external TTL or CMOS logic compatible clock can be...

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