MAX281

PRODUCTION

5th Order, Zero Error, Bessel, Switched Capacitor Lowpass Filter

Data Sheet (Rev. 0) Product Selection Table

Part Models: 7
1ku List Price: Starting From $8.47

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Overview

Bessel Lowpass Filter with No DC Error
Low Passband Noise
DC to 20kHz Cutoff Frequency
5th-Order AII-Pole Bessel Response

Internal or External Clock
Cascadable for Higher Order Rolloff
Buffered Output Available
8-Pin DIP or 18-Pln Wide SO Packages

The MAX281 is a 5th-order all-pole instrumentation lowpass filter with no DC error. The filter uses and external resistor and capacitor to isolate the integrated circuit form the DC signal path, thus providing DC accuracy.

The external resistor and capacitor together with the on-chip 4th-order switched capacitor filter form a 5th-order Bessel lowpass-filter. Bessel lowpass filters provide linear phase (constant group delay) response from DC to beyond the filter cutoff frequency, with some reduction in stopband attenuation.

The filter cutoff frequency is set by a clock which can be either internally generated or externally provided. The clock to cutoff frequency ration of 101 allows easy removal of clock ripple

MAX281A provides tighter specifications than the MAX281B for internal clock oscillator frequency and buffer amplifier offset voltage.

APPLICATIONS

Anti-Aliasing Filters
Data Loggers
Digital Voltmeters
Weigh Scales
Strain Gauges

Part Models: 7
1ku List Price: Starting From $8.47

Documentation

Data Sheet 1

MAX281: 5th Order, Zero Error, Bessel, Switched Capacitor Lowpass Filter Data Sheet (Rev.0) 05/01/1990

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX281ACPA+	8-PDIP-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281ACWE+	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281AEPA+	8-PDIP-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281AEWE+	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281BCPA+	8-PDIP-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281BCWE+	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX281BEPA+	8-PDIP-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Active Filters 1
MAX280	PRODUCTION	5th-Order, Zero-Error, Butterworth, Switched-Capacitor Lowpass Filter

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