[volt-nuts] Some questions to zeners (1N823-1N829)

[Ed Breya]

Andreas,

I think your expectations are not realistic - even if you could make 
such a reference, you could not transport its voltage to the ADC without 
thermoelectric effects causing error that would swamp the performance. 
To keep everything below the 1 ppm/deg C range you would have to put the 
entire circuit in controlled temperature - the reference, the ADC, and 
the signal connection to the outside world. Constant temperature 
operation would help with the overall tempco and hysteresis, but the 
long term drift and noise will be intrinsic to the devices, and 
unpredictable except in a statistical sense.

Ed