AD8233 in two electrode mode

Hi,

For our two electrode-based ECG design, we are planning to use AD8233. As part of the evaluation, we attempted the following but the signal captured doesn't look like ECG. It would be great, if someone can let us know if we are doing something wrong. 

The settings followed were 

  • DC leads off two-electrode mode 
    • FR is disabled (S1 in FR_DIS)
    • S2 in DC position
    • S3 in EN position
    • S4 in RLD_SDN 
    • P2 and P6 is loaded 
    • P9 and P8 is loaded
    • P4 is loaded
    • Electrodes are connected to RL and LA as well as tried with RA and LA
  • AC leads off two-electrode mode
    • FR is disabled (S1 in FR_DIS)
    • S2 in AC position
    • S3 in EN position
    • S4 in RLD_SDN 
    • P7 and P6 is loaded 
    • P9 and P8 is loaded
    • P5 is loaded
    • Electrodes are connected to RA and LA 
    • Even tried with P3 loaded
  • In both cases, the signal looks somewhat like the one shown below
Parents
  • 0
    •  Analog Employees 
    on Mar 27, 2020 8:16 AM 11 months ago

    Hi AnnamolAlex,

    Make sure that the inputs signals are going into the RA and LA terminal.
    For the AC leads off two-electrode mode config, you short the P5 which means that the input bias path was provided by the RLD amplifier and therefore it should RLD_EN.

    Can you confirm if you are using our evaluation board on your current setup? if not, can you share your actual schematic here, if possible, which will be helpful in debugging.


    Best regards,

    Emman

Reply
  • 0
    •  Analog Employees 
    on Mar 27, 2020 8:16 AM 11 months ago

    Hi AnnamolAlex,

    Make sure that the inputs signals are going into the RA and LA terminal.
    For the AC leads off two-electrode mode config, you short the P5 which means that the input bias path was provided by the RLD amplifier and therefore it should RLD_EN.

    Can you confirm if you are using our evaluation board on your current setup? if not, can you share your actual schematic here, if possible, which will be helpful in debugging.


    Best regards,

    Emman

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