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您好！电路图如附件中所示，DAC7625采用单电源5V供电，我想让输出电压能在0到4V间变化，所以参考电压VREFH输入的是4V，但数据手册中说“The reference inputs, VREFL and VREFH, can be any voltage between VSS+2.25V and VDD–2.25V”，难道我的连接方法不行吗？
