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Original question:

[FAQ] TMS320F28035: ADC Calibration and Total Unadjusted Error

TMS320F28035: TMS320F280049C ADC accuracy

Jan Buschen
Intellectual 341 points
Part Number: TMS320F28035
Other Parts Discussed in Thread: TMS320F280049C

Hello TI-Team,

I read the Data-Sheet and the following post:

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/587441/faq-tms320f28035-adc-calibration-and-total-unadjusted-error

which give me a good idea of calculating the adc accuracy of the tms320f280049c. I still wonder, if the factory off-set calibration is included in the TUE (total unadjusted error). And if the device is calibrated for 25°C, than in that range the offset and gain error should be definitly smaller? 

Thanks in advance and best regards,

Jan

  • +1
    TI__Guru 60865 points

    Hi Jan,

    For F280049, there is no need/recommendation to do offset self-calibration because the factory supplied offset trim is already very good.  Because of this, the offset error spec' in the datasheet uses the factory supplied offset trim value and this datasheet offset error specification can be used directly in the TUE calculation. 

    On the other point, yes, the offset and gain errors will both be better closer to room temperature.  The offset error and external reference gain error specifications don't have that much temperature variation, but much of the gain error specification in internal reference mode will be temperature drift.  However, note that this temperature drift is not necessarily linear and we unfortunately don't specify anything other than the worst-case error in the datasheet.