Calibration AD5522

Question

Hi, 
 I am developing a circuit with the AD5522. Concerning the calibration part, I am not sure how to interpret the datasheet. 
 During calibration, the FOHx and MEASVHx pins must be alone? Connect to nothing as in figure 50 
 
 It is also written (Datasheet P.39 Ref F): Calibrate the force voltage (2 points). In FV mode, write zero scale to the FIN DAC. Connect SYS_FORCE to FOHx and SYS_SENSE to MEASVHx, and close the internal force/sense switch (SW7). 
 If so, how do I calibrate the AD5522 evaluation board ? 
 Thank you for your help

MacManato · Accepted Answer

Hi, Gregory007. 
 Thanks for your patience. I reviewed the calibration procedure from the datasheet. 
 To answer your first question: The FOHx/MEASVHx are not without connections to SYS_FORCE and SYS_SENSE. What the diagram attempts to show is that you should select one channel at a time when doing the calibration (you can do that using internal registers). 
 For the second question, I think this snippet from the datasheet is pretty straight forward, unless the question is about M and C values computations. Using evaluation board or not, you can follow these steps. Make sure that there is not DUT on your board.

If these responses are not what you are looking for, please elaborate the questions further. 
 Thanks, Mac)

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Calibration AD5522