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AFE7769: Layout suggestion

Pavan Kalyan
Prodigy 225 points
Part Number: AFE7769

Hi,
we are using AFE7769 in our design due to layout constraints we want to route TX differential signals to BALUN in the inner layers  Kindly confirm if it's a feasible solution to our case and Give your valuable comments

 

Regards 
Pavan Kalyan

  • +1
    TI__Intellectual 2070 points

    Pavan,

    The components soldered on the Tx differential signal path are used for matching purpose.  With the Tx differential signals routed on the inner layers of the board, it may be difficult to adjust the values of the matching components if it doesn't meet the -10dB return loss spec.  In addition, depends on the layout and the # of layers inside the board, having the high frequency signal on the inner layer may cause unwanted coupling and possible interference with other signal path.  In theory, it is feasible, but not recommended by TI due to the reasons mentioned above.

    If customer does decide to route the Tx differential signal on the inner layer of the board, it is better to have several smaller vias than one large via. This design choice reduces inductance and provides additional paths for current in case one of the vias fails. 

    Kevin

  • 0
    Prodigy 225 points

    Hi Kevin,
    Thanks for your suggestion. 
    Our Issue has been resolved