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传感器、运放和AD的地可以直接相连吗?

 向大家求教个问题:

1.传感器输出0.5~4.5V之间的模拟电压,先用电阻分压(分压后输出电压范围控制在1.8V以内),然后经过运放搭建的电压跟随器,最后输出交给AD去采集。

2.系统中,传感器、运放都是5V供电,AD的工作电压是1.8V

3.这种情况下,可以将传感器的电源地、运放的电源地、AD的电源地以及参考地直接相连吗