10.1.5 Ground

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.