My AD9850 DDS chip and the 125 MHz canned oscillator run pretty warm to the touch. No info were found online, so here you are my values in room temperature (23°C): both stabilise between 45 and 48 °C.
I let it run for few hours and it didn't break nor catch fire.
Chip temperature is not output-frequency dependant, but output-frequency depends on the oscillator temperature. Touch the canned oscillator and it will change of few Hz. I am wondering if I should add a small heatsink to the oscillator. Is it worth?!