Below is UCC21540 DT design guideline. It is recommend to DT Pin with RC (10k//2.2nF). Does ADUM4221 also put decoupling CAP 2.2 nF for DT pin? Has any side effect for it? Thank you.
The ADuM4221 cannot have any decoupling capacitance on the DT pin. It is designed to not need it, and capacitance will affect the DT operation.