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THS4511: THS4511放大问题

Part Number: THS4511
Other Parts Discussed in Thread: TL431

利用THS4511做一个全差分放大,原理图如下 ,50Ω单端输入,+5V电压接5,6,7,8引脚,13,14,15,16引脚接地,VCOM端悬空,PD端悬空,在输出用10MΩ示波器探头进行测试,输出共模电压不在2.5V,输出的两个引脚共模电压是6V,而且不能起到放大效果,是PD脚不能悬空的问题吗?