I'm attempting to use the ADUM6401 to send 5V power over an isolation barrier but 3.3V logic as well. In the datasheet, it states that VDD1 and VDDL need to be connected together. Is it possible to have different logic and power supply voltage levels? I am limited on space so I would prefer not put in external logic shifters. In summary, I want 5V power in, 3.3V logic in, 5V power out and 3.3V logic out.