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ADC14X250EVM: connection of SERDES output to SMA - impedance matching question

Part Number: ADC14X250EVM
Other Parts Discussed in Thread: ADC14X250

Hello,

I am trying to connect the SERDES output of ADC14x250 to SMA.

I am using an evaluation board AD14x250EVM where the SERDES outputs, SO+ and SO- (pins 19 and 20), are routed to FMC mezzanine connector. Hence I am using a FMC breakout board https://www.kayainstruments.com/fmc-prototype-board/  or https://hitechglobal.us/index.php?route=product/product&path=18&product_id=210 to convert the high speed signals to SMA. 

The SERDES output is a source with 100ohms impedance that demands for a 100 ohm transmission lines and pcb traces, but SMAs are 50ohm impedance connections. So wont I have impedance mismatch? But I do observe that SMAs are used as standard high speed connection mediums, how do I make this connection?

Thank you in advance for your help.