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MAX291 - Switched-Capacitor Filters

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).

Key Features

  • o 8th-Order Lowpass Filters: Butterworth (MAX291/MAX295) Bessel (MAX292/MAX296) o Clock-Tunable Corner-Frequency Range: 0.1Hz to 25kHz (MAX291/MAX292) 0.1Hz to 50kHz (MAX295/MAX296) o No External Resistors or Capacitors Required o Internal or External Clock o Clock to Corner Frequency Ratio: 100:1 (MAX291/MAX292) 50:1 (MAX295/MAX296) o Low Noise: -70dB THD + Noise (Typ) o Operate with a Single +5V Supply or Dual ±5V Supplies o Uncommitted Op Amp for Anti-Aliasing or ClockNoise Filteri.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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AVAILABLE MAX291/MAX292/ MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters 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. An external capacitor is used to generate a clock using the internal oscillator, or an external clock signal can be used.