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ADS1298 difference between WCT and RLD

Pieter Willemen
Prodigy 180 points

Hi,

I'm just a bit lost here and was hoping that one of you could quickly point out the difference between RLD and WCT. Because the way I see them right now, WCT is just a bad version of RLD, because it has less connection possibilities. I especially got confused when I read there was a WCT_TO_RLD function.

Thanks!

Pieter Willemen
Antwerp, Belgium

  • 0
    TI__Mastermind 43915 points

    Hi Pieter,

    In theory, you could connect the WCT to have it used as the right leg drive for an ECG application, however, there are going to be some drawbacks of using it this way. The WCT is designed to drive a DC signal and, therefore, the bandwidth and drive strength of the line is limited. The line has poor response to AC signals which will hurt the system performance when it comes to the CMRR. The RLD line, when used in a closed loop configuration, has much better bandwidth in comparison leading to better response and more drive strength making it a better source for 'right leg drive.' With the better response to AC signals, the common mode rejection performance will increase significantly. The WCT line was designed and recommended to drive very high impedances making it ideal to drive the negative node of the converter for the chest leads.

    Regards,

    Tony Calabria

  • 0 in reply to Tony Calabria
    Prodigy 180 points

    Hi,

    this is exactly what I was looking for. Thank you very much!

    Pieter Willemen
    Antwerp, Belgium