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PGA281放大倍数失真

VSP-VSN=6V,VSOP-VSON=3.3V,VOCM=1.65V,DVDD=3.3V,放大倍数为1时,输入为1V,输出只有0.75V,而且EF一直是高电平,偶尔会变成低电平,这是什么原因?