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Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

Product Details

Key Features

Applications/Uses

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 25
Lowest Cutoff (Hz) (max) 1000
Filter Class Continuous
Filter Characteristic Chebychev
Program Method µP Bus
Pin Strap
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/20
SOIC (W)/20
Budgetary
Price (See Notes)
11.86
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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 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 25
Lowest Cutoff (Hz) (max) 1000
Filter Class Continuous
Filter Characteristic Chebychev
Program Method µP Bus
Pin Strap
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/20
SOIC (W)/20
Budgetary
Price (See Notes)
11.86

Key Features

  • Continuous-Time Filtering - No Clock Required
  • Dual 2nd-Order Lowpass Filters
  • Sections Independently Programmable: 1kHz to 25kHz
  • 96dB Dynamic Range
  • No External Components
  • Cascadable for Higher Order
  • Low-Power Shutdown Mode
  • Track-and-Hold (MAX271)

Applications/Uses

  • Anti-Aliasing and Track-and-Hold (MAX271)
  • Anti-Aliasing Filter
  • Low-Noise Applications
  • Lowpass Filtering
  • Output Smoothing

Description

The MAX270/MAX271 are digitally-programmed, dual second-order continuous-time lowpass filters. Their typical dynamic range of 96dB surpasses most switched capacitor filters which require additional filtering to remove clock noise. The MAX270/MAX271 are ideal for anti-aliasing and DAC smoothing applications and can be cascaded for higher-order responses.

The two filter sections are independently programmable by either microprocessor (µP) control or pin strapping. Cutoff frequencies in the 1kHz to 25kHz range can be selected.

The MAX270 has an on-board, uncommitted op amp, while the MAX271 has an internal track-and-hold (T/H).

Simplified Block Diagram

MAX270, MAX271: Typical Operating Circuit MAX270, MAX271: 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 .