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dac8728的8通道输出都是5V直流

Other Parts Discussed in Thread: DAC8728

基准电压2.5V   通过DSP往DAC的寄存器内写数都正确  也能读到

配置为同步输出模式  ldac的同步低电平也能看到    就是输出不变  请问这是什么问题?