the more you oversample, the higher the resolution becomes. is it a 1st order ?
assuming you are referring to a 1st order single bit quantizer, the SQNR=sqrt(9*(oversample ratio)^3/(2*pi^2))
SQNR is the signal to quantizer noise (SDM noise is typically referenced to the quantizer noise, not the component noise, or overall noise)
oversample ratio, the frequency ratio of SDM to target signal.
sooo if you had a OSR of say 128, your SQNR = 59.8dB
now use the well known equation SNR=6.02N +1.76dB, rearrange to get ENOB= (SNR-1.76)/6.02 = 9.64
in this case you would output 10 bits with the LSB being not completely reliable(its probability to be correct is greater then its probability to be incorrect)
Hope this helped
-Pb