8th-Order, Lowpass, Bessel, Switched-Capacitor Filters

Smallest, Lowest-Power 8th-Order Bessel Filters

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The MAX7401/MAX7405 8th-order, lowpass, Bessel, switched-capacitor filters (SCFs) operate from a single +5V (MAX7401) or +3V (MAX7405) supply. These devices draw only 2mA of supply current and allow corner frequencies from 1Hz to 5kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They feature a shutdown mode that reduces supply current to 0.2µA.

Two clocking options are available on these devices: self-clocking (through the use of an external capacitor) or external clocking for tighter corner-frequency control. An offset adjust pin allows for adjustment of the DC output level.

The MAX7401/MAX7405 Bessel filters provide low overshoot and fast settling. Their fixed response simplifies the design task to selecting a clock frequency.
MAX7401, MAX7405: Typical Operating Circuit MAX7401, MAX7405: Typical Operating Circuit Enlarge+

Key Features

  • 8th-Order, Lowpass Bessel Filters
  • Low Noise and Distortion: -82dB THD + Noise
  • Clock-Tunable Corner Frequency (1Hz to 5kHz)
  • 100:1 Clock-to-Corner Ratio
  • Single-Supply Operation
    • +5V (MAX7401)
    • +3V (MAX7405)
  • Low Power
    • 2mA (Operating Mode)
    • 0.2µA (Shutdown Mode)
  • Available in 8-Pin SO/DIP Packages
  • Low Output Offset: ±5mV


  • ADC Anti-Aliasing
  • Air-Bag Electronics
  • CT2 Base Stations
  • Post-DAC Filtering
  • Speech Processing

See parametric specs for Active Filters (47)

Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
Highest Cutoff
Oper. Temp.
maxminSee Notes
MAX7401 18Switched CapLowpassBesselClock155
-40 to +85
0 to +70
SOIC (N)/8
$2.98 @1k
MAX7405 3
SOIC (N)/8
$3.32 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX7405 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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