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TMS320F2812PGFA内部模数转换的两个参考电压(ADCREFP,ADCREFM)能拉取多大的电流?

请教,如题。

另外,ADC参考指南中建议的ADCREFP,ADCREFM电路(如下图),输出的三个电容(C6, C2,C3)和两个电阻 (R1,R3) 具体有些什么用途? 反馈给U2A的电压为什么从R1的右端取,能否从R1的左端取呢?    谢谢!