• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 527 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

system/self calibration for ADS1243

jack meng
Prodigy 20 points
Other Parts Discussed in Thread: ADS1243

hi,

I was just wondering if both system and self calibration need to be performed for ADS1243. If both are required, how can I write the values into the registers (only one set of registers are provided). If only one calibration is required, which one will provide more accurate values?

first time posting on this forum...

thanks,

Jack Meng

  • 0
    TI__Guru* 97775 points

    Jack,

    Normally, you would perform a self or a system calibration on the ADC, but not both.

    A self calibration will calibrate an offset by interally shorting the inputs and taking a measurement of the offset. Then, a reading of the full-scale is taken by internally routing the reference to the inputs and recording those as full-scale.

    On the other hand, if you have a full system that can be calibrated, you would externally set the inputs to zero (or set the system inputs to zero) and run an system offset calibration. Similarly, you can set the inputs to your full-scale and run a system gain calibration. System calibration is useful when you may have circuitry other than the ADC that may add some offset or gain error.

    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 20 points

    Joseph,

    thanks for your help.

    Jack