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Microprocessor Programmable Universal Active Filters

Product Details

Key Features

Applications/Uses

Parametric specs for Active Filters
Filter Type Universal
Filter Sections 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 57
Lowest Cutoff (Hz) (max) 0.4
Filter Class Switched Cap
Filter Characteristic Programmable
Program Method µP Bus
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
10.09
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Active Filters
Filter Type Universal
Filter Sections 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 57
Lowest Cutoff (Hz) (max) 0.4
Filter Class Switched Cap
Filter Characteristic Programmable
Program Method µP Bus
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
10.09

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX260, MAX261, MAX262: Functional Diagram MAX260, MAX261, MAX262: Functional Diagram 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 .