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THS4503的共模电压为2.5V,ADS1675的基准电压为3V,这2点并不能说明ADS1675的输入信号在其正常范围内;
您可以用示波器测量ADS1675的AINP对地电压波形、AINN对地电压波形和AINP-AINN的差分电压波形吗?建议将前面2个的单端波形显示在同一示波器界面中