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board layout for rj45 shield when using adn4652

Question asked by jschoene on Jul 8, 2016
Latest reply on Jul 11, 2016 by ConalW

Hi support,

 

I would like to use the adn4652 as an galvanic isolation interface between an incoming LVDS and an outgoing LVDS.

Both, the incoming and the outgoing LVDS use shielded CAT5e RJ45 connectors.

 

Clearly, both shields, the one on the incoming RJ45 and the one on the outgoing RJ45 connectors must be interconnected and electrically attached to the case.

 

I assume I should use the layers of the board as follows:

  Layer1: Isolated signals

  Layer2: Isolated GNDs: One side GND1 for incoming, other side GND2 for outgoing connectors as shown in CN-0256. Big gap in between.

  Layer3: Extensive shield layer

  Layer4: Isolated signals

 

Shield layer layout.png

 

Questions:

1) Are there any arguments speaking against one extensive full board covering shield layer?

2) Should the layer ordering be different? Like

  Layer1: Isolated signals

  Layer2: Isolated signals

  Layer3: Isolated GNDs

  Layer4: Extensive shield layer

 

Please let me know what you think.

Thank you,

Jan.

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