How to pick a transformer for ADC front end

Hello,

I'm testing out an ADC AD9238, and I'm making a board where I'd like to compare a diff amp's performance to a transformers. Both of these will be driven by an op-amp (it's a gain stage for my signal). My question is, how do I pick a transformer for this? It's an 8MHz signal 1Vpp, coming out of an op-amp.

Is there anything in particular I need to look for when looking for a transformer to drive this? If I could get it with a gain of 2 that would be great.

I tried looking up the transformer part on the eval board but they're not readily available on mouser or digikey

Thanks!