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LP2985A输出纹波过大

Other Parts Discussed in Thread: LP2985A

HI 

我现在用LP2985A稳压管做晶振时,发现LP2985A其中的一颗料输出纹波过大,有500mv,正常时300mv,现在导致我的晶振频率不准,是什么问题导致的纹波过大,有没有那种试验机构能分析稳压器是什么原因导致纹波输出大的,如何解决?

1和3脚接5V输入

2脚接地,4脚接0.01uF瓷介电容接地