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ADC resolution 12 vs 16 vs 24 bit

Question asked by Kevin A on Aug 9, 2017
Latest reply on Aug 10, 2017 by Kevin A

Regarding ADC resolution, 12 vs 16 vs 24 bit, is this software or hardware dependable? 


Looking at STM32F37x family, seems like they have an "effective number of bits/ENOB" of 14 bits, using sigma delta ADC they advertise it as 16 bit ADC? but able to oversample to achieve 24 bit?  The reason I'm asking is because I'm debating between STM32373C-EVAL and STM32H753I-EVAL, the later doesn't mention about the ADC resolution? can I just assume I can get 24 bit resolution from it?  My application is acquiring a signal in microVolts with maximum sampling frequency of 2KHz. 


Lastly, is there even such a thing as true hardware 24 bit ADC? Texas instrument is advertising their ADS1299 chip as 24 bit, but doesn't mention over sampling? is that just a marketing scheme or a true "hardware" 24-bit?