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Which of the ADS129n family for discrete channel micro-volt amplification?

Other Parts Discussed in Thread: ADS1299

Hello, 

We are wondering if there would be any chip in the ADS129n family that may be able to perform relatively as well as the 1299 with respect to noise/signal and degrees of amplification that has less channels? 

To know this, we would like to know what the source input voltage of the chips is rated to be. We don't have equipment sensitive to know. 

This is because we are also looking to make a device to measure only one or two channels discretely, therefore don't need the 8 the ADS1299 offers and furthermore, would like to find a cheaper alternative. 

Also, we are experiencing channel cross over in the ADS1299 we would like to avoid.

Understanding that this may come at a cost of having a lower noise to signal ratio...

Any advice?