To update our existing PCB to the M20048 here is what I believe needs to be done. It interfaces to a micro running at 3V3
- Run supply directly off the micro rail (which is coming off a switcher supply). Could there be issues with noise?
- Tuning pins 1 and 28 must be disconnected from 0V and connected to 0V via suitable resistor, cap etc
- VBCK needs to be connected to 1.8V
- ANT_OUT needs to be connected to ANT_IN via a capacitor.