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xeng_EE
Associate
September 19, 2024
Question

ADC voltage drop

  • September 19, 2024
  • 3 replies
  • 1278 views

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. Spikes.PNG

3 replies

Karl Yamashita
Karl Yamashita
Principal
September 19, 2024

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. 

If a reply has proven helpful, click on Accept as Solution so that it'll show at top of the post.CAN Jammer an open source CAN bus hacking toolCANableV3 Open Source
    Andrew Neil
    Andrew Neil
    Super User
    September 19, 2024
    @xeng_EE wrote:

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

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

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    I
    Imen.D
    Technical Moderator
    September 19, 2024

    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.

    "When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
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