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

Product Details

Key Features

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 2
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Butterworth
Program Method Clock
Oper. Temp. (°C) -40 to +85
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.38
Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 2
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Butterworth
Program Method Clock
Oper. Temp. (°C) -40 to +85
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.38
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Simplified Block Diagram

Technical Docs

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Filtered Search

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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) 2
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Butterworth
Program Method Clock
Oper. Temp. (°C) -40 to +85
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.38

Key Features

  • 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

Applications/Uses

  • ADC Anti-Aliasing
  • Post-DAC Filtering

Description

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.

Simplified Block Diagram

MAX7480: Typical Operating Circuit MAX7480: 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 .