Single_2nd_order_filter_section

Published:2009/7/24 12:59:00 Author:Jessie | From:SeekIC

The MAX274/275 continuous-filter architecture uses a four-amplifier state-variable design. The on-chip capacitors and amplifiers, together with external resistors, form cascaded integrators with feedback to provide simultaneous low-pass and bandpass filtered outputs. The low-pass and bandpass frequencies, as well as filter Q, are determined by external resistor values, using the equations shown. No external capacitors are needed. On-chip capacitors are factory trimmed to provide better than 1% pole-frequency accuracy over the temperature range. ±1%-tolerance resistors provide ±2%-accurate pole frequencies. Accurate filter Qs can also be obtained by compensating for amplifier bandwidth limitation using the graphs that are provided on the data sheet. Maxim, 1992, Applications and Product Highlights, p. 7-3.



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