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

Smallest, Lowest-Power 8th-Order Bessel Filters

Product Details

Key Features

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 5
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Bessel
Program Method Clock
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.16
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Simplified Block Diagram

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Parameters

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 5
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Bessel
Program Method Clock
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.16

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX7401, MAX7405: Typical Operating Circuit MAX7401, MAX7405: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .