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
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