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AD5522:FI nonlinearity

     

VREF=5V, AVDD=12V, AVSS=-12V
In the case of uncalibrated FI, it is found that the current error curve is not linear.
The abscissa of the figure below is: the negative maximum value to the positive maximum current value, taking a point every 2%, (a total of 101 sampling points).
The ordinate is: ERROR = (the current value between sys_force and gnd)  - (the error obtained from the theoretical value).