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ADC中ADCREFP、ADCREFM、ADCRESEXT的作用

请问这些引脚的作用?接的电容要求很高呢?如果自己飞线接电容是否会导致采样完全失真?

我这边飞线接的上述三个引脚,结果ADC的采样值最高只能到200,无法到4095。

谢谢!