I doubt you will find any such "canned" analysis. ENOB
@ speed cares about settling time, the low-overdrive
prop delay of your ladder comparators, various detractors
and you have to challenge the design appropriately, to
see. One design might be limited by raw comparator delay,
another by harmonic distortion, and so on - also depending
on the application "care-abouts" (which, do you know?).
One application might want to see you do a Fourier on a
fundamental sine wave input, and give THD and intercept-
points type answers; another might just want to see no
missing codes at speed on a series of worst case from:to
input steps. In any case your ENOB is the rollup of many
approaches to analysis, grounded in an application scheme.
There's much info on this, especially from online university
course materials. I am no kind of expert, in comparison.