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ADC Fluctuation in K22F microcontroller

Question asked by Prasanna Naik on Jun 19, 2019
Latest reply on Jun 19, 2019 by Robin_Shen

Hi,

   I am using FRDM K22F board for evaluation of ADC. I have configured a FTM timer at 625 usec. In ISR of FTM, i am triggering ADC using software trigger. Input voltage is DC 1.64V (No fluctuation observed on DSO) but there are fluctuations in ADC output as seen in "ADC.xlsx". Why is there so much fluctuation even when the input is stable. I am using baord's supply as VREF.

I have even tried long sampling mode with 24 clock cycles but still getting the fluctuation.

I have attached code for reference.

Please help in resolving the issue.

 

Thanks and best regards,

Prasanna

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