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C5517 adc采样数据异常问题

使用csl3.08中的csl_SARIntVoltRef_example例程,使用ADC GPAIN0进行采集,当外部电压为0.7时,显示为0x02 当外部电压为1.3时,显示为0x05。而手册上的说明ADC参考电压为VDDA_ANA 。值明显对应不上?请问有可能是什么问题?