Texas Instruments CD74HC4046A

the hc4046a and hct4046a are high-speed silicon-gate cmos devices that are pin compatible with the cd4046b of the "4000b" series. they are specified in compliance with jedec standard number 7. the hc4046a and hct4046a are phase-locked-loop circuits that contain a linear voltage-controlled oscillator (vco) and three different phase comparators (pc1 pc2 and pc3). a signal input and a comparator input are common to each comparator. the signal input can be directly coupled to large voltage signals or indirectly coupled (with a series capacitor) to small voltage signals. a self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers. with a passive low-pass filter the 4046a forms a second-order loop pll. view all in datasheet