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Ads1278数据手册中提到了该芯片SYNC引脚为同步输入，同步误差如何？
多片ADS1298使用时，sync脉冲宽度不小于1个clock 周期。
那是否是每产生一个SYNC就对应一次ADC转换？则SYNC的频率为ADC转换频率。
还是只需CLK等稳定后 只进行一次SYNC即可。而这时长时期运行的话，多个芯片会产生采样同步偏差。
