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General Description

The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296).

The MAX291/MAX295 Butterworth filters provide maximally flat passband response, and the MAX292/MAX296

Bessel filters provide low overshoot and fast settling. All four filters have fixed responses, so the design task is

limited to selecting the clock frequency that controls the filter’s corner frequency.

Features

? 8th-Order Lowpass Filters: Butterworth (MAX291/MAX295) Bessel (MAX292/MAX296)

? Clock-Tunable Corner-Frequency Range:

0.1Hz to 25kHz (MAX291/MAX292)

0.1Hz to 50kHz (MAX295/MAX296)

? No External Resistors or Capacitors Required

? Internal or External Clock

? Clock to Corner Frequency Ratio:

100:1 (MAX291/MAX292)

50:1 (MAX295/MAX296)

? Low Noise: -70dB THD + Noise (Typ)

? Operate with a Single +5V Supply or

Dual ±5V Supplies

? Uncommitted Op Amp for Anti-Aliasing or Clock Noise Filtering

? 8-Pin DIP and SO Packages

Applications

ADC Anti-Aliasing Filter

Noise Analysis

DAC Post-Filtering

50Hz/60Hz Line-Noise Filtering