IN74HC4046A

TECHNICAL DATA Phase-Locked Loop High-Performance Silicon-Gate CMOS IN74HC4046A The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. The IN74HC4046A phase-locked loop contains three phase comparators, a voltage-controlled oscillator (VCO) and unity gain opamp DEMOUT. The comparators have two common signal inputs, COMPIN, and SIGIN. Input SIGIN and COMPIN can be used directly coupled to large voltage signals, or indirectly coupled (with a series capacitor to small voltage signals). The self-bias circuit adjusts small voltage signals in the linear region of the amplifier. Phase comparator 1 (an exclusive OR gate) provides a digital error signal PC1OUT and maintains 90 degrees phase shift at the center frequency between SIGIN and COMPIN signals (both at 50% duty cycle). Phase comparator 2 (with ORDERING INFORMATION leading-edge sensing logic) provides digital error signals PC2OUT and IN74HC4046AN Plastic PCPOUT and maintains a 0 degree phase shift between SIGIN and COMPIN IN74HC4046AD SOIC signals (duty cycle is immaterial). The linear VCO produces an output TA = -55° to 125° C for all packages signal VCOOUT whose frequency is determined by the voltage of input VCOIN signal and the capacitor and resistors connected to pins C1A, C1B, R1 and R2. The unity gain op-amp output DEMOUT with an external resistor is used where the VCOIN signal is needed but no loading can be tolerated. The inhibit input, when h...