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ADC124s051在使用5V电源时,数据变为13位

Other Parts Discussed in Thread: ADC124S051

你好,我在使用ADC124S051时,使用3.3V供电时,模拟输入3.3V时,输出数据位12位4096。然而在使用5V电源供电时,输入5V信号输出却为8192。但是ADC的分辨率为12位,这是什么原因呢??希望帮我解答一下