MAX270

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


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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).

MAX270, MAX271: Typical Operating Circuit MAX270, MAX271: Typical Operating Circuit Enlarge+

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
Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
(Hz)
Highest Cutoff
(kHz)
VSUPPLY (Dual)
(±V)
VSUPPLY
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxminDualSee Notes
MAX270 22ContinuousLowpassChebychev
µP Bus
Pin Strap
10002555
-55 to +125
-40 to +85
0 to +70
PDIP/20
SOIC (W)/20
$11.29 @1k
MAX271 
PDIP/24
SOIC (W)/24
$11.80 @500
See All Active Filters (47)
Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 23 µP-Supervisor Chip Controls Programmable Filter
App Note 21 Three ICs Produce Pure Sine Waves

Quality and Environmental Data

Request Reliability Report for: MAX270 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX270CPP+
  • MAX270CWP+
  • MAX270EPP+
  • MAX270EWP+
  • MAX270EWP+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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