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UNISONIC TECHNOLOGIES CO., LTD U74HC4046A
PHASE LOCKED LOOP WITH VCO
CMOS IC
DESCRIPTION
The U74HC4046A is a phase-locked-loop circuit including a linear
voltage-controlled oscillator (VCO), three different phase comparators (PC1, PC2 and PC3), a common signal input amplifier and a common
SOP-16
comparator input.
The signal can be directly coupled to large voltage signals or with a
series capacitor coupled to small voltage signals. Small voltage signals
can be kept within the linear region of the input amplifiers with a self-bias
input circuit. The U74HC4046A and a passive low-pass filter form a
second-order loop PLL. With a linear op-amp, the VCO achieves excellent
linearity. The VCO requires an external capacitor and resistor.