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MAX7401, MAX7405
8th-Order, Lowpass, Bessel, Switched-Capacitor Filters

Smallest, Lowest-Power 8th-Order Bessel Filters


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 208kB)
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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.

Key Features   Applications/Uses
  • 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

    Key Specifications:  Active Filters
    Part Number Filter Sections Order Per Filter Section Filter Class Filter Type Filter Characteristic Program Method Lowest Cutoff
    (Hz)
    Highest Cutoff
    (kHz)
    VSUPPLY
    (V)
    Oper. Temp.
    (°C)
    Price
    max min See Notes
    MAX7401  1 8 Switched Cap Lowpass Bessel Clock 1 5 5
    -40 to +85
    0 to +70
    $1.98 @1k
    MAX7405  3 $1.98 @1k
    See All Active Filters (50)

    Diagram
    MAX7401, MAX7405: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-4788; Rev 1; 1999-06-01
    This page last modified: 2007-07-20


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