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ADS8568: 六个通道一直被钳位在0.5V左右

Part Number: ADS8568

A0,A1通道正常,但是B-D通道只要输入电压超过0.5V左右,引脚就会被钳位在0.5V左右(可正常进行AD转换),请问这是AD内部钳位电路的问题吗,芯片外围电路会不会导致此问题?