Advantech MMP3-21 Instrukcja Użytkownika Pobierz pdf (Strona 67)

Advantech SOM-Express Design Guide

Chapter 5 Carrier Board Design Guidelines 67

Figure 5-30 Differential signals route example

Figure 5-31 Bend example

5.7.3.2 Transformer

We recommend using the integrated Magnetic Modules/RJ-45 connectors. If using

the discrete Magnetic Modules and RJ-45 connector, the transformer should be

placed close to the RJ-45 connector to limit EMI emissions. Each differential pair of

data signals is required to be parallel to each other with the same trace length on the

component (top) layer and to be parallel to a respective ground plane. The 49.9 #

pull-down resistors for each differential pair are suggested to be located as close to

the transformer as possible. Figure 5-32 and 5-33 show the 10/100M and Gigabit

Ethernet Layout guidelines.

SOM

Express

On board

chip

Differential

Pairs

Differential

Pairs

Carrier board

Transforme

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Advantech MMP3-21 Instrukcja Użytkownika Strona 67