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ADS1299: Using a digital switch between electrode and ADC

Faisal Almesfer
Prodigy 80 points
Part Number: ADS1299

We have 1 x ADS1299-8 on our PCB which is used to measure EEG.

We would like to allow for more than 8 channels on our EEG headset. 

Is it possible to have a digital switch (multiplexor) between the electrode and the ADC to select the desirable channels?  Are there any negative implications of having a switch?

  • 0
    TI__Guru 55232 points

    Hi Faisal,

    This would be fine, as long as you are OK with non-simultaneously sampled data. Having a digital switch on the inputs will require a period of time to pass after switching before taking data again so that the digital filter can settle. If you would like to take data simultaneously, I would recommend daisy-chaining or cascading multiple ADS1299-8's.