Typically in order to build a filter at the o/p of a chip what data would you need?
1) Spurious response or S-parameter data?
2) What is the difference between the two data?

 

A specification of spurious response attenuation would be a good start, but we would need more. I'm assuming a bandpass filter since spurs can be above or below the carrier. S-Parameters are used to characterize 2-port networks. I'm not sure they would be useful unless you said something about using a particular device.
http://en.wikipedia.org/wiki/Scattering_parameters

How about:

1. Passband, upper and lower edge
2. Transition bandwidth and attenuation
3. Stopband attenuation
4. Passband ripple
5. Stopband ripple

Then we can talk about active, passive, or digital.

A good reference is:
Van Valkenburg,Analog Filter Design
http://www.amazon.com/Analog-Filter-Design-M-E-Valkenburg/dp/0030592461/ref=sr_1_1?ie=UTF8&qid=1428361912&sr=8-1&keywords=Analog filter Design