Microprocessor Programmable Universal Active Filters

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The MAX260/MAX261/MAX262 CMOS dual second-order universal switched-capacitor active filters allow microprocessor control of precise filter functions. No external components are required for a variety of bandpass, lowpass, highpass, notch, and allpass configurations. Each device contains two second-order filter sections that place center frequency, Q, and filter operating mode under programmed control.

An input clock, along with a 6-bit f0 program input, determine the filter's center or corner frequency without affecting other filter parameters. The filter Q is also programmed independently. Separate clock inputs for each filter section operate with either a crystal, RC network, or external clock generator.

The MAX260 has offset and DC specifications superior to the MAX261 and MAX262 and a center frequency (f0) range of 7.5kHz. The MAX261 handles center frequencies to 57kHz, while the MAX262 extends the center frequency range to 140kHz by employing lower clock-to-f0 ratios. All devices are available in 24-pin DIP and small outline packages in commercial, extended, and military temperature ranges.
MAX260, MAX261, MAX262: Functional Diagram MAX260, MAX261, MAX262: Functional Diagram Enlarge+

Key Features

  • Filter Design Software Available
  • Microprocessor Interface
  • 64-Step Center Frequency Control
  • 128-Step Q Control
  • Independent Q and f0 Programming
  • Guaranteed Clock to f0 Ratio-1% (A grade)
  • 75kHz f0 Range (MAX262)
  • Single +5V and ±5V Operation


  • µP-Tuned Filters
  • Adaptive Filters
  • Anti-Aliasing Filters
  • Digital Signal Processing (DSP)
  • Phase-Locked Loops (PLLs)
  • Signal Analysis

See parametric specs for Active Filters (47)

Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
Highest Cutoff
Oper. Temp.
maxminDualSee Notes
MAX260 22Switched CapUniversalProgrammableµP Bus0.017.55-
-55 to +125
0 to +85
0 to +100
SOIC (W)/24
$10.08 @1k
MAX261 0.4575
-55 to +125
-40 to +85
0 to +70
SOIC (W)/24
$10.09 @1k
MAX262 11405
-55 to +125
-40 to +85
0 to +70
SOIC (W)/24
$12.10 @1k

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.
Product Reliability Reports: MAX261.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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