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ADS124S06: REFOUT输出不正确

Part Number: ADS124S06

AVDD、DVDD接3.3V供电,想要REFOUT输出2.5V供外部传感器使用。REFOUT与REFCOM之间接1uf电容时输出为0V,电流很大,约90mA,REFOUT与REFCOM之间不接1uf电容时输出为1.81V,电流正常,怎么回事?