DRA722_17 Datasheet, PDF (361/408 Pages) Texas Instruments – Infotainment Applications Processor

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DRA722, DRA724, DRA725, DRA726
SPRS956B – MARCH 2016 – REVISED JANUARY 2017
Don't
Do
SPRS906_PCB_USB20_07
Figure 8-27. Do Not Cross Plane Boundaries
• Do not overlap planes that do not reference each other. For example, do not overlap a digital power
plane with an analog power plane as this produces a capacitance between the overlapping areas that
could pass RF emissions from one plane to the other, as shown in Figure 8-28.
Analog Power Plane
Unwanted Capacitance
Digital Power Plane
SPRS906_PCB_USB20_08
Figure 8-28. Do Not Overlap Planes
• Avoid image plane violations. Traces that route over a slot in an image plane results in a possible RF
return loop, as shown in Figure 8-29.
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Applications, Implementation, and Layout 361
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