Did someone actually measure and confirm the specced 0.1-10Hz noise of 0.12ppm-pp for the LTC6655LN?
So far it seems to be the lowest noise reference in the low frequency region apart from the ADR1000 with its real ~0.5µVpp at 6.6V, giving 0.08ppm-pp.
Like Andreas said, the datasheet-noise-graphs of the LTC6655LN dont continue to the necessary lower frequency regions to prove the spec.
Meanwhile we also have the REF70 from TI as a contender, claiming "industry’s lowest noise (0.23 ppmp-p)".
The LTC6655LN isnt available right now and id like to use it to test the noise specs of the new AD4030-24 ADC at different voltage input, not only with a shorted input. So if one of you guys have some 5V or 4.096V-versions that they want to sell within the EU write me a PM