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DAC81416: 测量不到负压

Part Number: DAC81416

当我把电压输出范围设置为-2.5到2.5伏的情况下,

我先设置code值为65535,测量通道电压为2.5v.

接着设置code值为16384,测量电压为0v,(我理解预期应该是-1.25左右)

这种是什么原因呢?