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ADS1220: suitable IC for RTD application

Che yi Su
Expert 1695 points

Part Number: ADS1220
Other Parts Discussed in Thread: ADS124S08

Hi,
Doest TI have ADS or OPA or INA IC that can meet accuracy +/-5℃ from -40 to 650  ℃ and error 1% from 650 to 950℃? RTD by use PT200 and extend to 950℃ and need to sense four RTD.

  • 0
    TI__Guru** 101175 points
    Hi,


    For sensing four RTDs, I think the more appropriate device would be the ADS124S08. There are 12 input channels plus an AINCOM line, which can be used to make more measurements than the ADS1220.

    I haven't done an analysis of the expected error and the error depends significantly on the reference resistor and the RTD itself. However, I think the ADS124S08 is the best device for your application. If you look in the datasheet, there is an example application design for RTD measurement with some calculations

    Also, there is a basic guide to setting up RTD measurements with ADCs. You can find it in the following link:

    www.ti.com/.../sbaa275.pdf


    Joseph Wu