Subsequently, the cost is lower when a single filter serves many analog inputs. You can use a dual digital potentiometer, two capacitors, and a single amplifier to configure a low-pass, second-order ...

For example, a programmable second-order, low-pass Butterworth filter with a corner frequency ranging from 200 Hz to 20 kHz can be designed by setting C1 = 0.022 µF and C2 = 0.1 µF.