What's the input and output impedance of ADL5315 for the range of current between 1nA-1uA?

What's the input and output impedance of ADL5315 for the range of current between 1nA-1uA?

Exact numbers weren't necessarily measured. Input is low impedance and output is high impedance.

Input Z is better at the lower input currents; you can see this on Figure 7. For a 20 dB change in input current you get a few mV change in input voltage, for most of the range up to 1mA.

The only parameter we have for output impedance is the Iout*Rout product which is 900V at 3uA, or about 300 MOhms. I'm pretty sure the output Z remains large inside of the range you are inquiring about.

The impedance looking into the IOUT pin (pin 8), i.e. the output impedance of the ADL5315 is 300 MOhms at a current of 3uA. Does that tell you what you need to know?