The ADA4961 is designed to be AC coupled, and it's gain increases below 10 MHz. For applications that need flat frequency response near or below 10 MHz, it'll be better to use completely dc-coupled, low-distortion differential amplifiers such as
-- ADL5565 Single-channel, 6 GHz diff ADC driver,
-- ADL5566 Dual channel, 4.5 GHz diff ADC driver, &
-- ADL5567 Dual channel, 4.8 GHz diff ADC driver.
Full details for these parts can be found at:
RF/IF Differential Amplifiers | Analog Devices