Pspice model help (AD712JR)

hi all--
I am trying to simulate an input signal conditioning circuit based
around an AD712JR dual opamp; the circuit is to provide protection for
the analog input stage of a DSP engine. I found a Spice macromodel
on analog devices' webpage for the AD712J. Does anyone know the
difference between the AD712J and the AD712JR? Alternatively, does
anyone know of a potential suitable substitute for the AD712JR that
has a readily available Pspice model? (of course this will depend on
the circuit implementation.)
Also, I found a document on TIs webpage detailing how to implement a
Spice macromodel (in text format) in a Pspice environment. Does
anyone have any experience with this? Anything I should look out for
in particular?
thanks!!
Rich