The M926-02 is a Phase-Locked Loop (PLL) based clock generator that uses an internal Voltage Controlled SAW Oscillator (VCSO) to produce a very low jitter output clock. From the M926-02-622.0800, an output clock frequency of 622.08 or 155.52MHz is provided from six LVPECL clock output pairs. (Other frequencies are available; consult the factory.) The accuracy of the output frequency is assured by the internal PLL that phase-locks the internal VCSO to the reference input frequency (19.44MHz for the M926-02-622.0800). The input reference can either be an external crystal, utilizing the internal crystal oscillator, or a stable external clock source such as a packaged crystal oscillator.