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ADS1299EEGFE-PDK: How to use ADS1299 in Differential mode for EMG signals?

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299

I am working on project which requires EMG signal. In Differential mode of ADS1299

  • Where should the Bias Electrode and the reference electrode be connected to in the EVM?
  • Can the Bias and Reference be internally shorted?

  • Hi Rahul,

    I've moved your post to the appropriate forum.

    Thanks,
    Rachel
  • Hey Rahul,

    The bias electrode is meant as a patient drive electrode similar to a RL electrode in ECG. This should connect to the internal bias amplifier. Details about the internal bias amplifier can be found in the ADS1299 datasheet.

    The reference electrode is meant as an electrode that each channel could use as a negative input. This is really a single-ended type of configuration. The reference electrode should be connected to SRB1 since that pin can be multiplexed to ever channel's negative input, if desired. See Figure 18 in the ADS1299 datasheet for a diagram of the input mux.

    Regards,

    Brian

  • Rahul,

    I forgot to answer your last question... There is no way to internally short the bias and reference electrodes. This is actually not desirable since the bias amplifier has quite a bit of flicker noise. It is better to apply the bias voltage to the patient and then measure back using separate electrodes since the bias amplifier's flicker noise will be common-mode to the inputs and will therefore be cancelled.

    Brian