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Original question:

ADS1298: ADS1298 Dynamic PGA gain modification

ADS1298: Interference problem

Gabriel Wang1
Genius 4055 points
Part Number: ADS1298

Dear Expert

A) we use normal register configuration (not using the enhanced guide of WCT), the channel 3is 53, 74, 74, and the baseline is very thick.

  • 0
    TI__Mastermind 19815 points

    Hi,

    May I ask which customer is this before I can support? If this cannot be disclosed in public, please let me know.

    --------------------------------------------------------------------------------------------------------------------------------------------------

    does customer have/use an ADS1298 evaluation kit/board(EVM)?  It's suggested customer use the same registers setting on the EVM and use EVM as a reference to do as side-by-side comparison for some initial troubleshooting.

    And, does customer use a ECG simulator? It's suggested to do test with ECG simulator first.

    -------------------------------------------------

    For "enhanced guide of WCT), the channel 3is 53, 74, 74"  -   this is not clear, pleas clarify what do "enhance" and channel 3 is 53, 74 and 74 mean?

    For "baseline is very thick" - this implies there are some noises - what are the source of the signals? does customer use a ECG simulator to do test? Suggest customer use ECG simulator and with proper ECG cables.

    For "A) after we use external crystal vibration, the initial sampling rate can reach the set sampling rate, but when the time grows, the shape of the waveform is collected after the random loss of the point and the severe impression."

    What is the external crystal you are using? Please check and validate its stability/accuracy/tolerance over time and/or temperature.

    It could be customer's host/master's SPI communication may not be stable and/or the data is not decoded properly by the host/master firmware and/or software.

    -------------------------------------------------------------------------------------

    Suggest customer use same registers settings on the EVM and see if EVM sees the similar issue as customer's PCBA, and then do a side-by-side comparison between EVM and customer's PCBA.

    And, try only one channel at a time and go through each channel one by one.

    Thanks

  • 0 in reply to ChienChun Yang
    Genius 4055 points

    Dear Chienchun

    This customer is .Thanks for your support these case , if u could contact us in email would be better .

    My email is gabriel.wang@arrow.com 

  • 0 in reply to Gabriel Wang1
    TI__Mastermind 19815 points

    Hi,

    Thanks.

    I will send you email.