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ADS8866: 用这个adc采集方波并用DAC8551还原出来,有如下问题

Part Number: ADS8866
Other Parts Discussed in Thread: TIDA-01469

 如图,黄色是原始的输入进ADC的波形,蓝色是DAC输出的波形,DAC单独测试过是可以输出1.6kHz的方波的;本次测试方法是ADC采集到的电压通过mcu算出电压再发给DAC,让DAC还原成原波形,但发现有200us左右的台阶,不知道什么原因