Per page 7 of the data sheet,the specified NF = 24.5dB. However, per the test conditions, the specified NF is based on a decimation ratio of 8. The NF of the device doesn't change with decimation (post processing). Hence, 10log(8)=9, NF=33.5dB. Thoughts?
ADC NF = Full scale (pin) - SNR - 10log(Fs/2) - thermal Noise
Fs/2 = 1.5GHz
(Fs/2) / 8 = 187.5MHz
SNR @ 2.6GHz -2dBfs) = 63.4dBfs
Full Scale = 1.7V p-p (+8.5dBm, 50 ohms)
ADC NF = 8.5 - 10log(187.5MHz) - 174 = 36.4dB