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ADC12DJ3200: foreground校准不成功

Part Number: ADC12DJ3200

AD的数据采进来,有效位有点低,本想校准一下输入电阻还是时钟什么的,我的步骤是先使能前台校准,在使能校准,然后进行SYSREF位置调整,检查前台校准是否完成(都寄存器06a和06e),接着进行NCO同步。最后读出06a值为:0000_1100,07e寄存器值为:0000_0100。校准未完成,AIN输入端接电阻也不对。