Effect of electronmagnetic on data trace

[dathoang86]

Please help me. I design a ADC circuit at 160 MSPS clock.
My circuit will operate in a high electron-magnetic, there are much noise in this envirment. I wonder about data trace layout, can i need to layout it in inner layer( in layers under top layer) ?

 

[chakravarthy80pcb]

better if u route it in inner layer as short as possible near to gnd plane and make it ground guarding.

 

[dathoang86]

And i have a question: can I need route the data trace with the same length ?