8.4.1.1 PCB Material

For digital circuit boards operating at less than 150 Mbps, (or rise and fall times greater than 1 ns), and trace

lengths of up to 10 inches, use standard FR-4 UL94V-0 printed circuit board. This PCB is preferred over cheaper

alternatives because of lower dielectric losses at high frequencies, less moisture absorption, greater strength

and stiffness, and the self-extinguishing flammability-characteristics.

8.4.2 Layout Example

10 mils

10 mils

40 mils

FR-4

0r ~ 4.5

Keep this

space free

from planes,

traces, pads,

and vias

Ground plane

Power plane

Low-speed traces

High-speed traces

Figure 8-6. Layout Example

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