The AD808 acquires frequency and phase lock on input datausing two control loops that work without requiring externalcontrol. The frequency acquisition control loop initially acquiresthe frequency of the input data, acquiring frequency lock onrandom or scrambled data without the need for a preamble. Atfrequency lock, the frequency error is zero and the frequencydetector has no further effect. The phase acquisition controlloop then works to ensure that the output phase tracks the inputphase. A patented phase detector has virtually eliminated patternjitter throughout the AD808.