The following are the guidelines for ground vias:
- The center ground pad of the
device must be solidly connected to the ground plane by using a 3x3 grid of
vias.
- Ground vias must surround the
perimeter of the pad.
- One of these ground vias must be
placed in the center pad as close as possible to pins #7 (RFIOP) and #8 (RFION).
- The ground via serves as the RF
ground return path.
- A ground via must be placed in
the center pad and closer to the #21 (VSW) pin.
- This acts as a ground return path
for the PMU.