When designing the Printed Circuit Board (PCB) layout, pin-specific recommendations
should be followed.
The AUX pin has the following recommendations:
- Antenna transmission line impedance should be 50 Ω. Take this into account when selecting the
PCB stack-up.
- Avoid excessive capacitance in routing by opening ground layers under component pads. For
example, if the routing is on the top PCB layer, open the ground plane under the AUX
pad on the next metal layer.
- When opening ground planes, avoid exposing noisy routings under the AUX pad.
- Avoid long routing because it causes excessive insertion loss which deteriorates RF
performance which cannot be reversed.
- Ensure continuous reference ground plane above, below, or both of the AUX
routing.