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我们用ADS1258做了一个采集板，外部MCU没有接入，给ADS1258供电为+2.5 -2.5V DVDD为3.3V，参考电压为2.048V。现在上电任何一个ADC引脚接10K电阻到地，发现有周期性脉宽波形。周期大约为650us，频率大约32.768k的一半。这个波形导致了我们对数据采集发生干扰很大，还望指导
