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ADS7280: 正负量程问题

Part Number: ADS7280

请问这款芯片是不是只能处理正信号呢?看手册是0~Vref的量程,是不是说,就算给到带有负的信号,ADC本身也不能处理,无法输出负的代码,也不能在程序中判断AD前级输入的是正还是负信号?