Chapter 336

True rail-to-rail, high input impedance ADC simplifies precision measurements

Mark Thoren

Abstract

The LTC244, a true rail-to-rail, high input impedance ADC that simplifies precision measurements, is described.

Keywords

Analog-to-digital converter

ADC

LTC2449

Introduction

High input impedance and a wide input range are two highly desirable features in a precision analog-to-digital converter, and the LTC2449 delta-sigma ADC has both. With just a few external components, the LTC2449 forms an exceptional measurement system with very high input impedance and an input range that extends 300mV beyond the supply rails.

A designer may trade off the LTC2449’s 200 nV resolution for faster conversion rates, but otherwise the LTC2449 ...

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