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MC74HC4046A

ON Semiconductor

Phase-Locked Loop

MC74HC4046A Phase-Locked Loop High−Performance Silicon−Gate CMOS The MC74HC4046A is similar in function to the MC14046 ...


ON Semiconductor

MC74HC4046A

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Description
MC74HC4046A Phase-Locked Loop High−Performance Silicon−Gate CMOS The MC74HC4046A is similar in function to the MC14046 Metal gate CMOS device. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. The HC4046A phase−locked loop contains three phase comparators, a voltage−controlled oscillator (VCO) and unity gain op−amp 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 leading−edge sensing logic) provides digital error ...




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