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ADS7865使用有一些问题

Other Parts Discussed in Thread: ADS7865

采用ADS7865参数手册中建议的外围电路设计方案
问题:在使用ads7865时,发现测出来的数据不准确,经检测ref的电压时发现当不接入待测信号时ref的电压为2.49v,当接入待测信号以后ref的电压为不稳定的值,最低甚至只有0.63v。这种现象是由什么可能的原因造成的?