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PI3DPX1202A

Document number: DS40115 Rev.2-1

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Ground referencing is highly recommended. If unavoidable, stitching capacitors of 0.1uF should be placed when reference plane

is changed.

Figure 6-7: Stitching Capacitor Placement

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To keep the reference unchanged, stitching vias must be used when changing layers.

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Differential pair should maintain symmetrical routing whenever possible. The intra-pair skew of micro-strip should be less than

5 mils.

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To keep the reference unchanged, stitching vias must be used when changing layers.

•

Differential pair should maintain symmetrical routing whenever possible. The intra-pair skew of micro-strip should be less than

5 mils.

Figure 6-8: Layout Guidance of Matched Differential Pair

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For minimal crosstalk, inter-pair spacing between two differential micro-strip pairs should be at least 20 mils or 4 times the

dielectric thickness of the PCB.

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Wider trace width of each differential pair is recommended in order to minimize the loss, especially for long routing. More con-

sistent PCB impedance can be achieved by a PCB vendor if trace is wider.

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Differential signals should be routed away from noise sources and other switching signals on the printed circuit board.