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TMS320F28379D: ADC result calibration

Vasu Mani
Prodigy 140 points

Part Number: TMS320F28379D

Hi Team,

Am reading single ADC signal and getting result values which is not corresponding to the input voltage.

I am giving 1.7v to ADC pin and result value should be 2110.

But am getting 2020. Am using CPU timer0 as trigger source and configured CPU timer0 for 27.78uS

I have attached my code here for your reference.

And i have a doubt on how to select Acquisition window (ACQPS).

When am increasing the sample window result value is increasing.

Please help me on this.

Thanks and Regards 

vasu

  • +1
    TI__Guru* 82860 points

    Vasu,

    If increasing the S/H window is helping to get closer to the ideal value of 2110 then I think you may not be giving enough settling time for the ADC S/H cap to accurately charge to the external voltage.

    Please take a look at this appnote, which goes into more detail as well as some simulation tools to help you pick a ACQPS value.

    https://www.ti.com/lit/SPRACT6
    Best,
    Matthew