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ADS1256EVM开发板使能buffer后采集不正常



1.5V电池,正接AIN1,负接AIN0

不使能buffer时,采集电池电压正常:

  

使能buffer后,采集电池电压变成这样:

  

基本上就是50Hz的工频干扰。

如果将AIN0AGND短路,使能buffer是这样:

  

板上全都是缺省设置,请问我是哪里接线错误吗?