When designing the Printed Circuit Board (PCB) layout, interface-specific
recommendations should be followed.
The MIPI RF Front-End Control Interface (RFFE) interface has the following recommendations:
- Parasitic capacitance in routing must not exceed 15 pF at SCLK or
SDATA.
- If additional filtering is needed, place capacitors C14, C15, and
C16 close to the component RFFE is connected to where the noise originates
from, for example, the antenna tuner.
- Avoid adjacent routings of SCLK and SDATA to noisy
routings, such as RF or supply.
- Use shielded PCB layers for RFFE routings whenever possible to minimize radiated
coupling.
- Follow the instructions of the RFFE peripheral datasheets.