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DAC8568输出电压较低时(低于3mV),输出端出现尖峰脉冲,是否正常,怎么解决?

Other Parts Discussed in Thread: DAC8568

DAC8568输出电压较低时(低于3mV),输出引脚悬空、无负载,输出端出现尖峰脉冲,如下图所示。请问各位前辈,是否正常,怎么解决?

输出电压在3mV以内变化时,尖峰脉冲的周期和幅值都在变化。