ADS1220: ADS1220

Hi Ankush,

The circuit for measuring a thermocouple could look something like this:

The thermocouple front end circuit would consist of an RC lowpass anti-aliasing filter, and Pull-up and pull-down resistors for biasing.

You can read more about the details of thermocouple measurements from the following app note: A Basic Guide to Thermocouple Measurements (Rev. A) (ti.com)

The following are examples of 2, 3, and 4 wire RTD configurations

You can read more about RTD measurements in the following app note: A Basic Guide to RTD Measurements (Rev. A) (ti.com)

As you can see, the circuit implementations would be a little different depending on the type of measurement you want to make. 

You can take a look at our ADS1220 EVM's schematic, which implements different front-end configurations for different types of measurements onto a single board, and it can serve as a starting reference frame for your design.

ADS1220EVM Evaluation board | TI.com

The schematic for the EVM can be found at the end of its user's guide: ADS1x20EVM User's Guide (ti.com)

Best Regards,

Angel

Hi Ankush,

You can take voltage analog to digital readings with an MCU ADC, but it is unlikely that you would be able to take ratiometric measurements (Refer to RTD app note for information on this concept). Our ADCs incorporate integrated IDACs and external reference inputs which facilitate these types of measurements.

For information related to MCUs, please post your question to the MCU forum.

Best Regards,

Angel