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ADS8168EVM-PDK: PSEUDO-DIFFERENTIAL 模式

Part Number: ADS8168EVM-PDK

这个adc的evb板是不是不支持 PSEUDO-DIFFERENTIAL 模式啊。我把com设置成Vref/2,com_cfg也设置为1,ain1的插针接到gnd 输出不是中间的0x8000.

用默认的设置测inl和dnl和手册里面还是有些差异的(thd是满足,snr不太满足,测量输入直流点的精度是±3lsb),我想问一下手册里面用的输入信号源是什么,有什么方法可以怎么改进我现有的输入信号。