• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 117 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

ADS1293: Noise Artifacts on ADS1293 Lead II/III (Channel 2) – Request for Guidance

jai Ganesh
Prodigy 10 points
Part Number: ADS1293

Tool/software:Stm32cube ide & TouchGFX

Hi,

We are currently using the ADS1293 for 3-lead ECG acquisition in our custom hardware platform. During testing, we’ve observed significant noise artifacts affecting Lead II and Lead III—both mapped to Channel 2 and its differential pair—despite multiple mitigation efforts. Notably, Lead I (Channel 1) consistently provides a clean, stable ECG signal.

To isolate the issue, we replicated the setup using the official ProtoCentral ADS1293 Evaluation Kit. Surprisingly, the same noise behavior persists on Channel 2 (Leads II/III), even under ideal test conditions:

  • Power Supply: Clean 3.3 V from a low-noise LDO

  • RLD: Enabled, configured with internal reference and connected to the subject

  • Electrodes: Medical-grade adhesive ECG pads with verified skin contact

  • Acquisition Settings: 500 Hz sampling rate with external analog HPF/LPF and a digital 50 Hz notch filter

This consistent behavior across both our hardware and the evaluation kit leads us to believe the issue may be related to:

  • RLD stability or impedance mismatch

  • Power supply noise coupling into Channel 2

  • Internal channel-to-channel crosstalk or routing sensitivity within the ADS1293

We would appreciate your guidance on the following:

  1. Channel 2-specific Recommendations

    • Are there known best practices or hardware considerations to improve noise rejection on Channel 2?

  2. RLD Optimization

    • Do you advise any specific RLD configurations (gain, reference source, electrode placement) that could help improve signal quality, particularly for Leads II and III?

  3. Validated Register Settings

    • Could you share any internally verified ADS1293 register configurations for clean 3-lead ECG acquisition—especially those optimized for Channel 2?

We’re happy to provide raw ECG logs, filtered waveform plots, or board schematics if they would assist your analysis.

Thank you in advance for your support. We look forward to your expert insights.

Warm regards,

Ganesh.

  • 0
    TI__Intellectual 1550 points

    Hello Ganesh,

    Apologies for the delay in our response. You can find settings configured specifically for 3-lead ECG in the ADS1293EVM. Instructions on how to implement this set of settings can be found in "Section 2.3.1. 3-Lead ECG Application" in the user guide.

    Please let me know if you're still seeing high-noise outputs after implementing these default settings. You can additionally use those settings as a base to modify your settings to achieve your desired acquisition settings.

    Regards,

    Payton