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board layout for rj45 shield when using adn4652

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


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,