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ADS7809 Ain输入电压范围选择问题

Carl Gao
Prodigy 60 points
Other Parts Discussed in Thread: ADS7809

ADS7809的Ain可以有不同的电压输入范围， 原理应该是通过不同的接法来对电压做分压， 实现匹配比较器的REF 2.5V，但是这里有一个33.2K电阻接入， 不太明白为什么， 有懂得可以解释下吗？谢谢。