I want to use an ADS1298 with single ended input, preceded by a low noise instrumentation amp front end. I'm planning on using two precision references.
The ADS1298 will be powered at 3volts and use a 2.4 volt reference with a .1 -10 hertz voltage noise spec of 1 uV.
Another precision reference at 1.2 volts will be used for the 1/2(Vref) non-signal ADS1298 input and the instrumentation amp ref.
The best .1 - 10 hertz voltage noise spec I've found for a 1.2 volt reference is 2.2 - 4 uVolts.
My question is whether there is any difference in the way the ref voltage noise (fed into the ref pin ADS1298) and the 1/2 ref voltage noise (fed into the Vinn pin of the ADS1298 and instrumentation amp ref pin) will affect the signal.
Thank-you,
Jonathan