TSX564四路OP内部硬件没有连接或是否用作不连接此引脚？

嗨，大家好！

我目前正在研究传感器硬件。我使用带有QFN16封装的TSX564四路CMOS运算放大器。有两个称为NC的引脚。那么这是否意味着它们与smd情况下的内部硬件没有连接或是否用作不连接此引脚？
我想创建一个有源保护运算放大器2的输入引脚IN2 +。因此，我的PCB设计连接IN2和NC引脚会很好。我试着在输入引脚IN2 +周围产生导体路径的“圆圈”。这应该保护它们上面的信号免受其周围PCB的电位影响。
是否可以将NC引脚连接到该圆圈或NC是否意味着不允许连接任何东西以获得TSX564的正确工作条件？！
谢谢你的帮助。
＃t.knb



以下为原文





Hi guys!

I�am currently working on a sensor hardware. I use the TSX564 quad CMOS operational amplifiers with the QFN16 package. There are two pins called NC. So does it means they are Not Connected with a bond to the inner hardware in the smd case or is it used as a Do Not Connect this pins?  
I want to create an active guarding of the input pin IN2+ of the op amp 2. So it would be nice for my PCB design to connect the IN2- and the NC pin. With that i try to generate a ''circle'' of conductor path around the input pin IN2+. This should guard the signal on them against the electric potential of the PCB around it.
Is it possible to connect the NC pin to this circle or does NC means it is not allowed to connect anything on him for the correct working terms of the TSX564?!
Thx for your help.  
#t.knb