ADE 7878A connect to standard CT

Dear Sir, 

I use ADE7878A to develop our product. I measure the each phase current by different CTs (50A/5A,100A/5A, 400A/5A). These CT are standard product in market.  So I want to fix the hardware design to match these CTs. The limit voltage of Ixn/IxP input is +/-0.5Vp-p in ADE7878A. How to design the burden resistor to match different CT??