用过的请教:DP83849的FXSD(无光输入)是3.3V PECL点评,还是3.3V TTL点评???急!!! 谢谢!!!
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DP83849 的FXSD输入时3.3V的LVPECL电平,一般光模块的LOS告警输出时3.3V 的TTL电平,所以对接的话,需要进行电平转换。
做这种转换的话,可以看看TI的电平转换器件:SN65LVELT22 or SN65EPT22
是的, DP打头的PHY,FX_SD输入都是LVPECL的。