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

Smallest, Lowest-Power 8th-Order Bessel Filters


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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 per Pkg. Order per Filter Section Filter Class Filter Type Filter Characteristic Program Method Lowest Cutoff (Hz) Highest Cutoff (kHz) Supply Voltage (V) Operating Temp. Range (°C) Price**
    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 (47)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

    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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