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ADS1194: Lead-off can't be detected with DIFF AMP

user3924424
Prodigy 30 points
Part Number: ADS1194


Hi,

A differential amplifier was connected before the A / D input to obtain a high-resolution heartbeat signal using the ADS1194.
However, lead-off detection does not work well.
Note:Lead-off can be confirmed without a differential amplifier.
Show my connection information.
Could you give me some advice?

 

  • 0
    TI__Guru 67096 points

    Hello Masahiro-san,

    Thank you for your post and welcome to our forum.

    The internal lead-off detection feature cannot work when an external amplifier is connected to the inputs.

    For more information, please visit our BIOFAQ homepage with links to related questions and collateral.

    Best regards,

  • 0 in reply to Ryan Andrews
    Prodigy 30 points
    Hi Mr. Ryan Andrews Good day Thank you for your reply. Is there any technical problem when using the lead-off detection function of ADS119x to connect the high resolution amplifier input channel to the adjacent channel in parallel and use the lead-off function of the adjacent channel?
  • 0 in reply to user3924424
    TI__Guru 67096 points

    Hello Masahiro-san,

    Are you suggesting to use the lead-off current sources of the adjacent channel (i.e. Channel 2) and connect them to the inputs of the INA? I believe this could work. The ECG signal would be measured on Channel 1. Channel 2 could remain powered-down (ADC and PGA) and only used to provide lead-off current sources on IN2P and IN2N.

    Best regards,

  • 0 in reply to Ryan Andrews
    Prodigy 30 points
    Hi, Mr. Ryan Andrews Thank you for your early reply. > Are you suggesting to use the lead-off current sources of the adjacent channel (i.e. Channel 2) and connect them to the inputs of the INA? yes Test the curcuit of product. Thank you for a very accurate answer.