What is the correct connection of pin 18 of the Si446x RF chips? GND or NC?
The recommended connection depends on the used crystal oscillator type.
- When using an XTAL, leave floating per our reference design schematic.
- When using a TCXO, connect to the TCXO’s GND what should be separated from the board’s reference ground plane per our reference design.
Si446x pin 18 (GNDX) connection