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TM4C1294NCPDT,插上网线,3.3v电压纹波就急剧增大,导致AD采样不准,是为什么!?

Other Parts Discussed in Thread: LM3S8962

原理图与EK-TM4C1294开发板相同,网络变压器用H1102NL,连网正常,但只要一连网线,LM1117-3.3的电压纹波急剧增大,导致AD采样不准。把网线拔掉(用仿真器查看大数组),则采样数据比较稳定。搞不懂什么原因!?