MAX291

PRODUCTION

8th-Order, Lowpass, Switched-Capacitor Filters

Also See MAX7401/5 8th-Order, Low-Power Bessel Filters

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Overview

  • 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

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. An uncommitted operational amplifier (noninverting input grounded) is provided for building a continuous time lowpass filter for post-filtering or anti-aliasing.

Produced in an 8-pin DIP/SO and a 16-pin wide SO package, and requiring a minimum of external components, the MAX291 series delivers very aggressive performance from a tiny area.

Applications

  • 50Hz/60Hz Line-Noise Filtering
  • ADC Anti-Aliasing Filter
  • DAC Post-Filtering
  • Noise Analysis

MAX291
8th-Order, Lowpass, Switched-Capacitor Filters
MAX291, MAX292, MAX295, MAX296: Typical Operating Circuit
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Hardware Ecosystem

Parts Product Life Cycle Description
Active Filters 6
MAX7401 PRODUCTION 8th-Order, Lowpass, Bessel, Switched-Capacitor Filters
MAX7405 PRODUCTION 8th-Order, Lowpass, Bessel, Switched-Capacitor Filters
MAX7409 PRODUCTION 5th-Order, Lowpass, Switched-Capacitor Filters
MAX7410 PRODUCTION 5th-Order, Lowpass, Switched-Capacitor Filters
MAX7413 PRODUCTION 5th-Order, Lowpass, Switched-Capacitor Filters
MAX7414 PRODUCTION 5th-Order, Lowpass, Switched-Capacitor Filters
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