ADUM5020 and ADUM5028 for RS-485 Circuit

Hello,

I would like to use ADUM5020/ADUM5028 for a RS-485 circuit. With ADM2795E transceiever.
120Ohm Termination, 3.3V bus and 500kbit/s. 

Do you have an application note or example design about power calculations?
Thanks for any help.