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Only for training and service purposes
3.4 26 MHz Clock (Crystal, X500)
The 26 MHz clock (X500) consists of a XO( Crystal Oscillator) which oscillates at a frequency of 26 MHz. The
AD6548 requires only an external low cost crystal as the frequency reference. The circuitry to oscillate the crystal
and tune its frequency is fully integrated. The Oscillator is a balanced implementation requiring the crystal to be
connected across 2 pins. There is a programmable capacitor array included for coarse tuning of fixed offsets (e.g.
crystal manufacturing tolerance), and an integrated varactor for dynamic control. The oscillator is designed for use
with a 26MHz crystal. Dedicated control software ensures excellent frequency stability under all circumstances.
3. TECHNICAL BRIEF
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Figure 3.4 CRYSTAL CIRCUIT DIAGRAM
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