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MAX7480
8th-Order, Lowpass, Butterworth, Switched-Capacitor Filter


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Description
FULL DATA SHEET (PDF, 87kB)
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The MAX7480 8th-order, lowpass, Butterworth, switched-capacitor filter (SCF) operates from a single +5V supply. The device draws only 2.9mA of supply current and allows corner frequencies from 1Hz to 2kHz, making it ideal for low-power post-DAC filtering and anti-aliasing applications. The MAX7480 features a shutdown mode, which reduces the supply current to 0.2µA.

Two clocking options are available: 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 MAX7480 Butterworth filter provides a maximally flat passband response. The fixed response simplifies the design task to selecting a clock frequency.

Key Features   Applications/Uses
  • 8th-Order, Lowpass Butterworth Filter
  • Low Noise and Distortion: -73dB THD + Noise
  • Clock-Tunable Corner Frequency (1Hz to 2kHz)
  • 100:1 Clock-to-Corner Ratio
  • +5V Single-Supply Operation
  • Low Power
    • 2.9mA (Operating Mode)
    • 0.2µA (Shutdown Mode)
  • Available in 8-Pin SO/DIP Package
  • Low Output Offset: ±5mV

 
  • ADC Anti-Aliasing
  • Post-DAC Filtering

    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) Package RoHS Available Operating Temp. Range (°C) Price**
    MAX7480  1 8 Switched Cap Lowpass Butterworth Clock 1 2 5 PDIP/8
    SOIC/8
    Yes -40 to +85 $1.98 @ 1k
    See All Active Filters (45)
    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
    MAX7480: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-1416; Rev 0; 1999-01-01
    This page last modified: 2007-07-20



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