Switched filter IC MF10

9-42 — elektor september 1982 applikator a full description with applications for the very versatile MF 10 by National realised with only half an IC. By connecting both halves 4th order filters (24 dB/octave) can be realised. Obviously filters having an even higher steep- ness can be constructed by cascading a num- ber of MF 10s. Any of the classical filter networks (such as Butterworth, Bessel, Cauer and Chebyshevl can be formed. Features Besides the worthwhile qualities already men- tioned, the MF 10 is extraordinary in as much as the clock to centre frequency ratio is accu- rate to ± 0.6%. This kind of accuracy, which incidentally remains the same irrespective of the number of times you duplicate the circuit, can never be realised by conventional filters using OTAs. The accuracy of these filters really is useful, especially when considering them for use with microprocessors, for auto- matic testing and measuring equipment, and intelligent meters. The stability of the filter ...