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DAC8871基准电压问题

Other Parts Discussed in Thread: DAC8871

这是我的DAC8871设计原理图,贴片电阻电容使用0402封装,通过调节两个电位器让Vrefh = 12V,Vrefl = -3V,但是我发现这两个电压基准值会随着我的DAC SPI 数据输入的变化而变化,最后导致输出误差大,请问是原理图有什么问题吗?谢谢。