Thermocouple Temperature Measurement System with Less Than 500 uA Current Drain

Thermocouple Temperature Measurement System based on the AD7793 24-bit sigma-delta analog-to-digital converter (ADC). The AD7793 is a low power, low noise, complete analog front end for high precision measurement applications. The device includes a programmable gain amplifier (PGA), an internal reference, an internal clock, and excitation currents, thereby greatly simplifying the thermocouple system design