inverting input impedance of AD8000

Hi,

I'm using AD8000 to build schmitt trigger. I connect the input signal to the inverting input. I would like to have 1M ohm input impedance while now I wonder how much the inverting input impedance of AD8000 is. How can I make sure my input impedance is 1M. AD8000 is supplied between 0 and 5V.

Thanks

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