Q5V supply is disturbed due to the ADUM5402 isolator's DC/DC converter. Are
there any recommendations on layout that might help?
AWe have an application note AN-0971 titled recommendations for control of
radiated emissions with isoPower Devices. iCoupler® digital isolators with
integrated isolated power (isoPower®) employ isolated dc-to-dc converters that
switch currents of ~700 mA at frequencies as high as 300 MHz. Operation at
these high frequencies raise concerns about radiated emissions and conducted
noise. PCB layout and construction is a very important tool for controlling
radiated emissions and noise from applications containing isoPower components.
This application note identifies the radiation mechanisms and offers specific
guidance on addressing them.