Zero DC-Error Lowpass Filters
This chapter is devoted to simplified design with typical switched-capacitor lowpass IC filters (the Maxim MAX280 and Linear Technology LTC1062). The MAX280 is an enhanced version of the LTC1062. The enhancements (according the Maxim) include tighter specifications on the internal clock-oscillator frequency and the buffer-amplifier offset voltage. Both ICs require few external components and can be designed to provide a wide range of cutoff frequencies using simple equations.
The MAX280/LTC1062 is a 5th-order lowpass filter with no DC error. The ICs use an external resistor and capacitor to isolate the IC from the DC signal path, thus providing DC accuracy. The resistor and capacitor, along with the on-chip ...
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