The ADuM4121/ADuM4121-1 are 2 A isolated, single-channel drivers that employ Analog Devices, Inc.’s iCoupler® technology to provide precision isolation...
ADuM4121 on Analog.com
Do I have to connect the Miller clamp on the ADuM4121?
No, If the Miller clamp is not being used, it is recommended to short it to GND2.
However it should be noted that the ADuM4120 has similar performance to the ADuM4121 and has a smaller package so could…