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ADS1120: ADS1120

Amina Shrestha
Prodigy 30 points
Part Number: ADS1120

I want to use ADS1120 for 3 single ended measurement for 3 RTD's. Can you walk me through the steps on what configuration should the RTD's be connected to the analog input and how to set up the current source to the right pin? 

Thank you

  • 0
    TI__Guru** 113765 points

    Hi Amina,

    Welcome to the forum!  There are 2-wire, 3-wire and 4-wire RTDs, and the resistance of the RTD can vary at 0 deg C.  The most common are PT100 (100 ohms)and PT1000 (1k ohms).  To get the best possible resolution you would follow the datasheet design circuits for RTD measurements starting in section 9.2.2 on page 52 of the datasheet:

    http://www.ti.com/lit/ds/sbas535c/sbas535c.pdf

    If you share which RTD type and resistance you plan to use I can give you a more detailed answer on how to set this up.  I would also need to know what analog supply voltage you plan to use.  The easiest approach would be to place the 3 RTDs in series if possible, however the measurement would not be single-ended for all three RTDs.  Is single-ended measurement a requirement?  Review the datasheet circuits before replying.

    Best regards,

    Bob B