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DAC7512数据转换输出和数字不成比例

Other Parts Discussed in Thread: DAC7512

电源我采用5V供电,当选择DB13 为0 DB12为1 输出1kΩ到地模式  ,DAC数据大于0x7FF时是按5V比例输出电压,当小于等于0x7FF时,是按2.5V基准 比例输出电压,这

是为什么?

另外DB13和DB12 选择00是什么模式,下面低功耗对应的是00 还是处00以外的?

还有01和10接入1k和10k对输出电压有什么影响