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PCM1863共模抑制比达不到数据手册的典型值

Other Parts Discussed in Thread: PCM1863

我们有个音频处理器的产品正在做小批量试产,但是目前产品中使用的PCM1863在生产测试时CMRR不通过,要求CMRR在40dB以上,规格书给出的PCM1863的CMRR典型值56dB,但实际测试时有些样机的CMRR值在34~40dB (试产30pcs,有6pcs出现这种情况)。用的是AP测试仪做的测试,请帮忙看下什么原因会导致这种情况?有什么解决办法?