Hello,
I am designing a board that includes the ADS117L11 AD-converter. Right now I'm having a hard time dimensioning the reference driver (I want it to be fully differential, so I need to buffer Refp and Refn). In Page 30 in the datasheet a simplified circuit for the reference input is given, while the internal switsches switch with fmod (in my case 26 MHz)
Now depnding on the values of C_REF and the parasitic switch resistance (and maybe also pin parasitic inductance), I need to design the driver different. Is there any Informaltion on these values? Especially the capacitance is hard to guess.
Thank You and best regards,
Christian