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DS90UB928Q PCB层数建议?

一对差分信号输入布线无需跨层,周边包地,5对差分信号输出需要跨层连通,在现方案中采用2层基板 LAYOUT,走线不会很复杂。

 

请问TI工程师,4层布板的必要性很高吗?产品需要符合电磁兼容方面的法规,为车规一般性标准即可。为了节约成本现采用的是2层LAYOUT。