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若差分ad输入端空接，那样的话采样值会是多少？
又来一个悬空测试的.
强烈建议不要做悬空测试, 什么值多有可能, 特别是对个通道的情况, 会受先前采样通道的影响.
会是无规律的乱码，不断变化
不要悬空。实在不用的话，接地都比悬空好。
