ADC is an analogue to digital converter, DAC is a digital to analog converter, they aren't separate they are built into the Digital PWM or analogue pwm.lol they don't have part numbers as they 1/20th the size of the digital PWM which is the size of any chip on your board. Spec sheet wont tell you anything on the PWM. find the digital PWM and read the number off of it type it into google and if they have released the spec sheet then it will come up, intesill also has not released to the public. I can show you an example tho, as i will just to make you feed better.
here is an older version of both, first if a analogue pwm, second is a digital pwm.
listen man i don't just talk out of my ass, i can show you the article on the volterra vs interstil it think it has chil in there as well.
you honestly do not know what you are talking about and its ok, your not an EE i don't expect you to understand what is below, but you can see the different styles of how the signals are passed. The current Intersil and Chil pwms are under their own internal NDA, idk why but they are.
i just want to say tho, that is really doesn't matter and i hope asus got the certification, but earlier they did not. The PWM means very title to overall board or even VRm performance as long as the company didn't cheap out on it, which asus and gigabyte do not. All in all the powerhouse of the VRm are the MOSFETs which change 12v to 1-2v for the CPU and they are the ones that define the power of the board. When they say 16 phases they are talking about 16 MOSFETs, not a PWM with 16 phases are they don't make those, they make 4 -12 phase pwms and then piggyback MOSFETs and it works.
The ones pictured below are for the R3E and for the UD9/UD7/UD5/UD3
Now if I think the issue with ASUS's VRD12 crap was that Chil didn't redesign the whole PWM simply added a secondary DAC and ADC for SVID and then updated the firmware b/c that is the beauty of digital pwms, you can update the firmware, and thus change the operating parameters.