I have an Instrumentation amplifier feeding into a 1 op amp 60Hz notch filter. The output of notch filter is feeding 3 bandpass multi feedback filters ( 4th order, 2 opamp each). Do i need to put any thing between the output of the notch filter and the 3 filters or can i connect all 3 to the output of the notch filter?

For another circuit i have a instrumentation amplifier that needs to feed a comparator,ADCand 50 Ohm line driver, what should be between the output of the IA and the 3 devices?

any help would be great.

 

Any schematic would be great.
We can't imagine your supply voltages, current budget, and part numbers from here.

 

Depending upon the input impedances of the circuits you are driving you should be able to connect their inputs all in parallel.

 

There it is, a, "should" and an offer to check the power budget.
Take your pick.