ADuC723 offset calibration

when use the offset calibration, which conversion mode should I choose ? All of the three conversion mode can be use? And if my system has a negtive offset, for example, -5mV as the input signal, can the offset calibration can cancel out this -5mV? To my knowledge, if I choose the single-end converstion mode, the input signal need to be larger than 0mV, so -5mV will cause problem even I use the offset calibration?

  • 0
    •  Analog Employees 
    on Apr 9, 2020 7:57 AM 7 months ago

    HI Harry,

    Yes, all 3x conversion modes can be used - the effect is the same.

    I don't have a board to check this on but, the offset calibration register should be signed so, you can increase/decrease the offset adjustment.

    To calibrate, you could apply 10mV to the input and keep adjusting ADCOF until you get the correct ADCDAT value.

    Regards,

    Mike