Filters

(see the software section of this page for filter-design software)

Notes

1. Filters may be either of the switched-capacitor variety (need no supporting capacitors or resistors but do require a clock source and introduce some noise at the switching frequency) or analog variety.
2. The maximum possible order if all the chip is used to design a single filter.  Many chips permit either a single high order filter or several lower-order filters to be constructed.
3. Lowpass, Highpass, Bandpass, or Bandstop.
4. Butterworth (BW), Bessel (BL), Chebyshev I (C1), Chebyshev II (C2), Elliptic (E).
5. The maximum supply, input, and output voltages.  Usually these can be operated on a single-sided supply (e.g. 0-5V) if the input signal is given a DC offset (e.g. 2.5V).
6. Some filters have an uncontrolled DC offset.  For these filters, Fmin is above  the ideal 0Hz.
7. To calculate the external components to build a filter using the UAF42, Burr-Brown provides the excellent software program Filter42 for download and its associated documentation.