Crystals above 30 MHz (as much as >200 MHz) are normally operated at sequence resonance in which the impedance seems at its minimum amount and equivalent into the collection resistance. For these crystals the collection resistance is specified ( SMD crystals consist of very little section noise, which leads to https://7prbookmarks.com/story19017803/the-fact-about-smd-crystal-oscillators-that-no-one-is-suggesting