I need a high Isolation and switched from the ADUM5401 to the ADUM6401. Now I have many disturbances at the Inputs (IA-IC), the ADUM5401 was "quiet".
I attached a Picture taken with our scope, where you see the 3 Inputs and the VDD1 from the ADUM6401.
The Inputs of the ADUM are driven by logic gates, so they don't have a high impedance and I don't know how to reduce the ripple.
Can you help me ?