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ADS1298ECGFE-PDK: ADS1298ECGFE-PDK

Rajwinder Grewal
Prodigy 10 points
Part Number: ADS1298ECGFE-PDK
Other Parts Discussed in Thread: ADS1298

Tool/software:

Hi everyone,

I’m currently using the ADS1298ECGFE-PDK to acquire EEG/EMG signals from throat muscles, but I’m facing difficulties in getting usable data and would appreciate any suggestions.

I’m not sure whether the issue lies with my setup or if the board itself might be damaged, so I’m sharing the details below in the hope of getting some guidance.

I’m using only 4 electrodes on the following pins below, but I’m experiencing a lot of noise — especially when using a 6V power adapter. After raising the issue with the TI team and following the guidebook instructions,


I tested the kit using a battery pack supply but I’m still facing the same issue. It seems the problem isn’t just noise — my concern is even if this kit is functioning correctly or damaged? As the signals appear very random.

I’ve tried both medical-grade (reusable AU/ AG plated electrodes) and disposable electrodes, but the results remain the same. While I understand some level of noise is expected, I would still expect some usable EMG/EEG signals during muscle movements. However, the data quality seems unusable.

I’m attaching a screenshot of one of the signals for reference. Currently, I’m using only 4 electrodes with the following pin configuration:

  • Pin 9 – RA

  • Pin 10 – LA

  • Pin 11 – LL

  • Pin 14 – RL

Could you please review this and let me know if my setup might be incorrect or if there’s something else, I should try? Appreciate Feedback and suggestion 


Thanks 
Mani

  • 0
    TI__Guru 67036 points

    Hi Mani,

    Thank you for your post.

    To validate the EVM hardware and software setup, I suggest configuring the channels to measure the internal square wave test signal. Details about the required register settings can be found in the ADS1298 datasheet and the EVM User Guide. 

    Applying external bio-potential signals to the EVM requires careful consideration of the patient-electrode interface, including the electrode materials, cable shielding, etc. Please note that our EVM is never intended to be used to acquire bio-potential signals from any live test subject; rather, we encourage customers to use precision waveform generators or patient simulators for their evaluation. 

    Running the EVM hardware and your PC on battery power vs. wall power can certainly reduce power line noise coupling, but will not perfectly eliminate it. Other techniques include matching the channel P and N input impedances to maintain high CMRR, and digital post-processing filters.

    Regards,

    Ryan