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请问TM4C1231d5pm的VDDA和VDDC如何处理?

在芯片的datasheet的ADC章节,指出了“Converter uses VDDA and GNDA as the voltage reference”,也就是说VDDA就是电压基准。

在电气特性章节写到“To ensure proper operation, VDDA must be powered before VDD if sourced from different supplies, or connected to the

same supply as VDD”

也就是说VDDC要么和VDD连到一起,要么就必须在VDD之前上电。对于ADC采样精度要求高的地方,VDDC和VDD连一起,用VDDC(3.3V)做电压基准肯定精度不够,有什么好办法解决呢;如果不连一起,又有什么好的解决方法呢?

求大神、专家解答,谢谢!