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DAC8832: 某些电压无法正常输出

Part Number: DAC8832

 这是我根据datasheet设计的电路图,想输出0-3V的直流电平,可以正常的输出0V,3V,1.6V,1.4V,2V等,但是我发现无法输出1.5V,输出的电压是0V,这是什么问题?两块demo上都存在同样的问题