Circuit function and advantage
The circuit in Figure 1 functionally provides a high precision, multi-channel thermocouple measurement solution. Accurate thermocouple measurements require precision components to form a signal chain that should amplify weak thermocouple voltages, reduce noise, correct nonlinearities, and provide accurate reference junction compensation (commonly referred to as cold junction compensation). This circuit solves all of these challenges in thermocouple temperature measurement and has an accuracy of ±0.25°C or more.
The circuit in Figure 1 shows the connection of three K-type thermocouples to the AD7793 precision 24-bit sigma-delta analog-to-digital converter (ADC) to measure the thermocouple voltage. Since a thermocouple is a differential device rather than an absolute temperature measurement device, the reference junction temperature must be known to obtain an accurate absolute temperature reading. This process is called reference junction compensation and is often referred to as cold junction compensation. The ADT7320 precision 16-bit digital temperature sensor in this circuit is used for cold junction reference measurements and provides the required accuracy.
This type of application is very popular for accurate temperature measurements that require cost-effective over a wide temperature range offered by thermocouples.
Figure 1. Multichannel thermocouple measurement system (schematic diagram: all connections and decoupling are not shown) 
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