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Pin-Programmable Universal and Bandpass Filters

Product Details

Key Features

Applications/Uses

Parametric specs for Active Filters
Filter Type Bandpass
Filter Sections 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 140
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Programmable
Program Method Pin Strap
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

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Parameters

Parametric specs for Active Filters
Filter Type Bandpass
Filter Sections 2
Order Per Filter Section 2
Highest Cutoff (kHz) (min) 140
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Programmable
Program Method Pin Strap
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
0

Key Features

  • 32-Step Center Frequency Control
  • 128-Step Q Control
  • Independent Q and f0 Programming
  • Guaranteed Clock to f0 Ratio—1% (A grade)
  • 75kHz f0 Range (MAX264/268)
  • Single +5V and ±5V Operation

Applications/Uses

Description

The MAX263/264 and MAX267/268 CMOS switched-capacitor active filters are designed for precision filtering applications. Center frequency, Q, and operating mode are all selected via pin-strapped inputs. The MAX263/264 uses no external components for a variety of bandpass, lowpass, highpass, notch and allpass filters. The MAX267/268 is dedicated to bandpass applications and includes an uncommitted op-amp. Two second-order filter sections are included in both devices.

An input clock and a 5-bit programming input precisely set the filter center/corner frequency. Q is also programmed from 0.5 to 64. Separate clock inputs for each filter half operate either an external clock or a crystal.

The MAX263 and 267 operate with center frequencies up to 57kHz while the MAX264 and 268 extend the f0 range to 140kHz by employing lower fCLK/f0 ratios. The MAX263/264 is supplied in 28 pin wide DIP and small outline packages while the MAX267/268 is supplied in 24 pin narrow DIP and wide SO packages. All devices are available in commercial, extended, and military temperature ranges.

Simplified Block Diagram

MAX263, MAX264, MAX267, MAX268: Typical Application Circuit MAX263, MAX264, MAX267, MAX268: Typical Application 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 .