Hi! I'm currently designing a device around the AD9958 involving the internal oscillator. I was somewhat stunned by the unusually high recommended capacitor values (39pF versus the usual 18-22pF). If the crystal manufacturer recommends 20pF, which would be the right value to use? Or would I have to look out for crystals that are explicitly specified for higher capacitances? Sorry for the noob-ish question; I just want to avoid potential sources of error for such a delicate circuit.