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ADS1292R: Is is possible to run the chip without an RLD?

Venkatramanan GR
Prodigy 10 points
Part Number: ADS1292R


Hi,

A very basic doubt. Is it possible to Run the system in a non RLD configuration and using RA, LA and LL Electrodes only (In this case, do we need LA?). How will the AC coupling work? While using this configuration is is possible to obtain Lead II ECG? While reading Lead II ECG, is it possible to measure the RR too in the other channel? Any reference diagrams to enumerate the same? 

Thanks 

  • 0
    TI__Mastermind 19815 points

    Hi,

      According to the data sheet and ECG concepts -

    I.e. without using RLD, people may encounter more noise, and may need to do further analog signal conditioning and/or DSP to meet the product's needs, but it all depends on the applications and product's constraints.

    I would suggest do experiments and study to compare with and without RLD and other constraints(e.g. resources, sizes, electrodes, environment, etc) before making final decision. 

    There do exist products that use one one lead, i.e. RA->LL, so LA is not necessary, but depends on your production and applications.

    Can you clarify/explain what you mean by "Will the AC coupling work?"

    Do you mean RA->LL by Lead II ECG?  If yes, then as mentioned above, RA-> LL is the simplest fundamental achievable ECG signal.

    ADS1292R provides Respiration Rate capability.

    You may purchase an EVM evaluation board/kit to test and proof your concepts.

    https://www.ti.com/tool/ADS1292RECG-FE

    I would also suggest buy an ECG simulator if this is for product development.

    Thanks

  • 0 in reply to ChienChun Yang
    Prodigy 10 points

    Thank you for the prompt reply.

    My primary application is to build a system that can monitor Lead II ECG from patients who are stationary along with Respiration Rate. So selecting ADS1292R be the correct choice? Also by AC coupling I meant using a Capacitor to remove the DC part of the signal without using a RLD.

    Thanks again. 

  • 0 in reply to Venkatramanan GR
    TI__Mastermind 19815 points

    You may start with ADS1292R, and you may purchase an EVM evaluation board/kit to test and proof your concepts.

    https://www.ti.com/tool/ADS1292RECG-FE

    Yes, you may need some analog RC filtering for your development.

    Using RLD or not heavily depends on the applications and environments and setups, it's not easy and too early to say one must need or must not need the RLD; experiments and analysis are required before making decisions.

    I would also suggest buy an ECG simulator if this is for product development.

    Thanks