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ADS1298 electrodes for ECG

Paul Nikerov
Prodigy 30 points
Other Parts Discussed in Thread: ADS1298

Hello! I've just started my own project of making ECG electrodes for ADS1298 and i've got 2 questions:
1) Should I connect the wires between the pins on board and electrodes directly. I use 3 pins: RA, LA and LL. The pins configuration is represented in figure below:
2) As far as I can understand for RA, LA and LL I need to use IN2x and IN3x both positive and negative Leads-Off, but I can't choose the right configuration of jumpers that needed to be placed or removed. Can you help me? I look forward to your reply. 

  • 0
    TI__Mastermind 38745 points
    Hey Paul,

    1. You will probably need some anti-aliasing (RC filter) and some patient protection in the form of a resistor, but other than that, you need no other active components between the electrodes and the analog inputs of the ADS1298.

    2. I don't believe you need jumpers to do lead-off detection. The current will come directly from the analog input pins. Please clarify if you are still having issues.

    Brian
  • 0 in reply to Brian Pisani
    Prodigy 30 points

    Hey Brian,

    1 Which RC filter should I use and how? Just connect to each wire? (for connection between board and wires i use simple DB15 male connector)
    2 So I just can use default jumpers configuration?
    And can you tell me what "Shield" is? 

  • 0 in reply to Paul Nikerov
    TI__Mastermind 38745 points

    Hey Paul,

    1. You should chose an RC filter with a cutoff frequency in the tens of kHz range. The RC filters should be placed between the connectors and the ADS1298.
    2. I don't know to which jumpers you are referring. Can you provide further details?
    3. An electrode cable shield is like a Faraday shield which intends to protect the electrodes from EMI.

    Brian