采样结果误差很大,有0.3V左右,我用的是硬件串行模式,内部参考电压,供电±12V,AVDD为5V,量得参考电压输出2.5V,外围电路没有问题。采样时序是通过fpga控制的,如图所示,stp文件的采样时钟是25M,可以看到每次转换结果低位跳变较大,输入信号可是稳定不变的,请高手指点迷津,谢谢!
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