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AN11329: Implementing sigma-delta ADC with LPC800 comparator

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Rev. 1 — 21 February 2013
NXP verified: 

This application note describes the basic implementation, along with program source code, and optimization recommendations to implement a sigma-delta ADC using the integrated analog comparator in the LPC81xM series microcontrollers. The implementation within this application note can be used to sample an input voltage that is higher than the microcontroller’s supply voltage.