MCP3421A1T-E/OT(2006) 데이터 시트보기 (PDF) - Microchip Technology

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MCP3421A1T-E/OT
(Rev.:2006)

18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

Microchip Technology 

4.8 Aliasing and Anti-aliasing Filter

Aliasing occurs when the input signal contains time-

varying signal components with frequency greater than

half the sample rate. In the aliasing conditions, the

device can output unexpected output codes. For

applications that are operating in electrical noise

environments, the time-varying signal noise or high

frequency interference components can be easily

added to the input signals and cause aliasing. Although

the MCP3421 device has an internal first order sinc

filter, its’ filter response may not give enough

attenuation to all aliasing signal components. To avoid

the aliasing, an external anti-aliasing filter, which can

be accomplished with a simple RC low-pass filter, is

typically used at the input pins. The low-pass filter cuts

off the high frequency noise components and provides

a band-limited input signal to the MCP3421 input pins.

MCP3421

© 2006 Microchip Technology Inc.

DS22003B-page 9

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