Phase noise at 2GHz:
| f | dBc/Hz | |||
| [MHz] | 10kHz | 100kHz | 1MHz | 100MHz |
| 2000 | -100 | -108 | -120 | -157 |
Your measurement appears to be close to what our measured values.
ADC full-scale input is 0.625Vpk so I think the scenario you described would still be fine regarding ADC dynamic range.