What is the intended application for the on-chip ADC? Being only 12-bits, it isn't suitable for high-quality audio, which is obviously where the device will mainly be used.
I don't know about that? there is a lot of oversampling and who knows with proper conditioning and a small array
of XS-1SU1's with their ADC's multiplexed you could achieve a higher ENOB's, plus trix, like RIS random insertion sampling or sampling modulated oscilators for FM synthisis. The thing about developers is, they will find unique ways to utilized there tools, like musicians :mrgreen: