Crystals previously mentioned thirty MHz (around >200 MHz) are normally operated at sequence resonance exactly where the impedance seems at its minimal and equivalent for the series resistance. For these crystals the collection resistance is specified ( SMD crystals comprise really tiny phase sound, which results in very little jitter https://dirstop.com/story22212717/the-fact-about-smd-crystal-oscillators-that-no-one-is-suggesting