ADC14C105, SFDR at the frequency within a limit of operating bandwidth

Hello,

 On the datasheet of this ADC, page 9, it is shown tht SFDR is about 82dBFS at Fin = 240MHz,  but since the bandwidth of this ADC is 1GHz, what if I sample a signal located, for example at 980MHz, is there any idea how well in terms of SFDR would this ADC perform?

thanks