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AD7626应用问题



其芯片中的VCM引脚,手册中说其固定输出为2.048V,在参考设计中电源+为7.25,电源-为-2.5

请问VCM引脚是不是否可以不外接?有什么影响?

不对称的供电电源是否是为了获得对称的输入相应?

谢谢