Bessel filter
Maxim Integrated Products
accuracy.
The external reaistor and capacitor together with the on-chip 4th-order switched capacitor fitter form a 5th- order Dos sol lowpass filter. Bessel lowpass filters provide linear phase (constant group delay) response
from DC to beyond the filter cutoff frequency, with some reduction in stopband attenuation.
The filter cutoff frequency is set by a clock which can be either internally generated or externally provided. The clock to cutoff frequency ratio of 101 allows easy removal of clock ripple.
MAX281A provides tighter specfications than the MAX281B for internal dock oscillator frequency and buffer amplifier offset voltage.
MAX280 is available for applications requiring a maximally flat (Butterworth) amplitude response.
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