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只有一片ADS1274,输入AINN和AINP短接,转换后的数字量用示波器看后12位一直处于跳动的状态

Other Parts Discussed in Thread: THS4521, TINA-TI

      RT,我的控制芯片是FPGA,只有通道1工作,其他3个通道的PWDN置低,模式为高分辨,SPI,输出数据格式为fixed,TDM;***,CLKDIV置高。输出的DRDY是连续的周期信号,周期为20us,低电平大概为50~100ns。参考电压较稳定。

     请问下大家,前提没有单端转差分模块,不论输入短接还是输入稳定直流电压,后12位都在跳动,这是为啥呢?