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UCD9244带两个ucd7242,电压输出不正常。

其中一个7242短路已焊下,目前只有另外一路7242输出0.9v和1v电压(799kHz)。问题如下

1.纹波大,用lecroy高速示波器看在400-600mv之间(测开发板在200-300mv,均为测电容两端),请问这正常吗?是否测试方法有问题。

2.单路输出不正常,我实在monitor中通过on/immediatly off来控制是否输出。两路中总有一路不正常,大概在1.3-1.5v左右。请问这是什么原因?

谢谢