The SY100EP140L is a high-speed, 2GHz phasefrequency detector optimized to control ultra-low noise VCXOs (voltage-controlled crystal oscillators) in telecom and datacom systems. The phase-frequency detector compares two input signals--a reference input and a feedback input. Any mismatches in the two input signal's phase or frequency will result in the output UP or DOWN pulse stream. When the difference between the UP and DOWN outputs are integrated, the resulting control signal speeds-up or slowsdown a VCO or acts as the error voltage for a precision VCXO.