Is there any data with regards to change in output impedance on change in output voltage .
With best regards and wishes
Output Impedance is a frequency-dependent parameter of an op-amp. See figure 43 and 45 of AD8029's datasheet.
In terms of change in output voltage, one parameter that you must consider the amplifier's output current drive. This parameter will be critical when the load is low, ILoad = Vout/RLoad. When Vs=5V, Isc=60 mA, this will limit the drive capability of the amplifier.