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ADS1291 QFN 封装,中间那个触点是接信号地还是模拟地?

Other Parts Discussed in Thread: ADS1291

ADS1291 QFN32封装,四周引脚的中间是一个比较大的触点,

我测量这下个触点.它不跟任何引脚连接的.我画PCB的时候这个触点要不要连接到地?跟数字地还是跟模拟地连接?

谢谢!!!