ADC voltage drop

[xeng_EE]

Hi I have been seeing voltage spikes and drops on the signals coming from the ADC. I'm not sure what is happening and wanted to see if anyone else has seen this before. 

[Karl Yamashita]

The ADC is an input so why would there be signals be coming from the ADC?

Now if that graph is the readings from the ADC and you're outputting the values to the PC?, then more than likely an issue with the HW that the ADC is picking up. 

[Andrew Neil]

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@xeng_EE wrote:

Hi I have been seeing voltage spikes and drops on the signals coming from the ADC.

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So have you looked at the input signal to the ADC - does it have corresponding "spikes and drops" ?

[Imen.D]

Hello @xeng_EE and welcome to the Community, 

Make sure to respect the ADC characteristic values in the datasheet: having the adequate sampling time, the right input impedance, with stable VDDA and VREF+ voltages.