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AD7172-2内置基准及LDO输出问题,ADC采样Error

TI工程师:

您好,

调试AD7172-2的时候发现ADC总是发生超量程错误(ADCSTATUS寄存器返回值为0x40),后来发现配置好的REFOUT引脚没有电压输出,REF+输出为零,还有REGCAP_A为负值大约0.8V(照理说应该是内置1.8V的输出1.8V),请问能否帮忙看看是什么问题。 附件是我的电路原理图。