AD7367 ADC calibration

I am using the AD7367 and am interested in achieving better accuracy.  I am using a high accuracy external reference.  I am using the ADC in either the +/-10V or +/-5V range.

Can I perform a one time gain and offset calibration, or would I need to do that calibration on every startup to get a performance advantage?  Is there a recommended procedure for performing the offset/gain calibration of this part?

  • Hi,

    What are the other components in your system? This part does not have a calibration routine but you can surely develop one using two known points. You would have to do this every startup to just to be sure that appropriate coefficients are used.

    Regards,

    Karen

  • I'm not sure what other components would be relevant.  The voltage reference is a MAX6173AASA+.

    I want to use more than 2 points to ensure that I don't use a point that in some cases happens to fall close to the worst nonlinearity error portion of the transfer curve.  Given that the AD7367 is somewhat unique with it's input range, I would like some guidance on the best calibration procedure and how frequently I need to calibrate to have an advantage over no calibration.  Can I use the same calibration to correct for +/-5V and +/-10V ranges?  what would be the best voltages to use as references during the calibration assuming ~4 calibration points?

    Thank you,

    Patrick

  • Hi, Patrick.

    I believe this has been answered offline. Also, this thread here may help.

    Regards,

    Karen

  • This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin