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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 337

Easy Drive ADCs simplify measurement of high impedance sensors

Mark Thoren

Abstract

The LTC2484 family of delta-sigma converters that simplify measurement of high impedance sensors is described.

Keywords

Analog-to digital converter

delta-sigma ADC

LTC2484

Delta-sigma ADCs, with their high accuracy and high noise immunity, are ideal for directly measuring many types of sensors. Nevertheless, input sampling currents can overwhelm high source impedances or low-bandwidth, micropower signal conditioning circuits. The LTC2484 family of delta-sigma converters solves this problem by balancing the input currents, thus simplifying or eliminating the need for signal conditioning circuits.

A common application for a delta-sigma ADC ...

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