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