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ADS1298R: ADS1298: Respiratory System, How to implement External Respiration Circuitry?

Part Number: ADS1298R
Other Parts Discussed in Thread: ADS1298, ADS1294, ADS1292R

Hi,

We are developing a 12-lead respiration monitoring system based on ADS1298 or ADS1298R.

The problem is, to use the internal respiration module, analog channel 1 is "wasted" and only 11 leads are obtained.

It could be solved using the option for respiration impedance measurement of External Respiration Circuitry, is there someone who can guide us through this aproach, as doesn't seem to exist documentation.

We know it could be solved by using an aditional ADS129x such as ADS1294, as it seems to be the best combination, but we want to minimize the footprint in the final product.

If there is any other approach, please let us know.

Thank you for your time!