I have a VCCS based on AD8130. After many googling and studying.. now I'm frustrated!
for checking the output capacitance usually I put a 1Kohm resistor on the output and check the 3-dB corner frequency. so the output capacitance is C=1/(2*pi*R*f3dB)
But I really I don't know how I should calculate the output impedance of the VCCS.
The best example or reference for your application is the CN0151. See figure 3.
The first AD8510 is a TIA to convert the current out of AD5443. So if you are in voltage mode, disregard the first OA. The computations are shown and explained the circuit note.
Should you have additional concerns, don't hesitate to let me know.