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DAC8811的满量程增益误差测试问题

满量程增益误差手册中±4mV,如果基准10V,反馈电阻5kΩ,那么满量程输出理论为9.996-10.004V之间。VREF用外部精密10V基准,测量满量程输出电压,不同的器件差别挺大的,能从2mV到几百mV之间,是哪里不太对吗,布局吗