• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 176 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

AFE4404: Transitory response never stabilizes

AFE4404: AFE4404

Camilo Buritica
Prodigy 10 points
Part Number: AFE4404

Hi there.
I need to determine the DC values of the signal, I cannot use a high pass, this phenomenon seems to be a thermal drift, some other idea to correct this situation.

Thank you so much

  • 0
    TI__Mastermind 49746 points

    Hi Camilo,

    How does the data look like over 10k samples right after the AFE is configured vs the 10k samples after a couple of minutes? Do you see this thermal drift in both the data?

    If the drift is present only initially, then our suggestion would be to delay the data processing and this delay would be a function of the LED current.

    Also can you calculate the perfusion index (AC/DC) at a few locations in the 10k samples window and check if the index remains a constant?

  • 0 in reply to Praveen Aroul
    TI__Mastermind 49746 points

    Hi Camilo,

    Since I did not hear back from you for quite some time, I assume that your issue has been solved.

    Note that I'll go ahead and close this thread. Replying to the thread will re-open it if necessary at some point.