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...