INTRODUCTION
Various concerns must be addressed when dealing with temperature sensing applications, which fall into two broad categories: precision temperature measurement and system thermal management. Precision temperature measurement applications (such as those encountered in the process control industry) require highly accurate temperature sensors. Applications of this type frequently use a thermocouple (or higher precision sensor) in concert with low offset/low drift analog interface circuits to acquire and condition the temperature signal with minimum error. Sensor absolute accuracy and linearity are primary considerations; sensor cost is a secondary issue.