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ADS1291: How to use only the two electrodes of LA and RA of ADS1291 for design?

Annie Liu
Genius 10295 points

Part Number: ADS1291

Hi Team,

Customer has a product that uses the ADS1291. There are some questions need your help.
1. There are only two electrodes, LA and RA, and how should the hardware be designed?
2. What are the disadvantages of the solution compared to the three electrodes (RA, LA, RLD)?
3. Without RLD electrodes, common mode interference will be greater, can medical standards be met?

Thanks.

  • 0
    TI__Guru 68786 points

    Hi Annie,

    Thanks for promoting our ADS1291!

    This is a fairly common application question. Here's a related post. Please refer your customer to some of the collateral we have in the FAQ page linked below.

    In summary, two-electrode ECG systems must be AC-coupled. It may be more difficult to pass CMRR requirements, but we cannot say for sure whether it's impossible or not.

    Best regards,