74VHC4046
Description
The VHC4046 is a low power phase lock loop utilizing advanced silicon-gate CMOS technology to obtain high frequency operation both in the phase parator and VCO sections. This device contains a low power linear voltage controlled oscillator (VCO), a source follower, and three phase parators. The three phase parators have a mon signal input and a mon parator input. The signal input has a self biasing amplifier allowing signals to be either capacitively coupled to the phase parators with a small signal or directly coupled with standard input logic levels. This device is similar to the CD4046 except that the Zener diode of the metal gate CMOS device has been replaced with a third phase parator. Phase parator I is an exclusive OR (XOR) gate. It provides a digital error signal that maintains a 90 phase shift between the VCO’s center frequency and the input signal (50% duty cycle input waveforms). This phase detector is more susceptible to locking onto harmonics of the input...
