Can you please tell me what is the measured input impedance of the XTALN pin (pin M12). I intend to use external 30.72MHz TCXO clock.
The XTALN (Pin M12) has an input resistance of ~ 10 kΩ in parallel with 10 pF.
The level for the clock should be 1.3 V p-p maximum(lower swings can be used but will limit performance). This signal can be a clipped sine wave or a CMOS signal. The best performance will be seen with the highest slew rate possible.
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