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SPI 接口应该参考IOVDD, 进一步在EVM板上能大概看得出外部用的是IOVDD(大小由客户决定),您可以到ADC论坛和工程师double 确认一下。
单片机部分您要看看是不是开路输出,即大小可能依据外部上拉来决定。建议看一下手册的介绍。