Fairchild MM74HC4046 Manuals

The MM74HC4046 is a low power phase lock loop that utilizes advanced silicon-gate CMOS technology to achieve high frequency operation. This device contains a low power linear voltage controlled oscillator (VCO), a source follower, and three phase comparators. Phase Comparator I is an exclusive OR (XOR) gate that provides a digital error signal to maintain a 90 degree phase shift between the VCO's center frequency and the input signal (50% duty cycle input waveforms). Phase Comparator III is an SR flip-flop gate that can be used to provide the phase comparator functions and performs similarly to the first comparator. Phase Comparator II is an edge sensitive digital sequential comparator.

The MM74HC4046 is a low power phase lock loop utilizing advanced silicon-gate CMOS technology to obtain high frequency operation both in the phase comparator and VCO sections.