Why Op AD829 only offer differential input impedance?

[alphi]

impedance + ad829

AD829 op datasheet only offer differential input impedance,how can I to know the input+ impedance and input- impedance?
I want use ad829 for gain +2 noninverting circuit,and source impedance is 50K,how can i do it?
AD829 datasheet link:
h**p://www.analog.com/UploadedFiles/Data_Sheets/AD829.pdf

 

[Verba]

I guess you can not use it.
With input capacitance ~5pF you'll get fc<1MHz
If your frequencies that low, choose another amp
This one is designed for low impedance lines, hundreds of ohms