I am working on a PCB design with STM32 MCU. On the PCB there will be 2 MAX490 transceivers and one bluetooth module. Communication speed will be 921.6 Kbit/s for all communication elements. Bluetooth module uses 3.3V as MCU and transceivers use 5V supply voltage. Board will be powered by a 12V battery.
So i need 2 buck converters for to step-down 12V to 3.3V and 5V. But i am concerned about their EMI performances. Would these converters make any interference on the comm lines?