74HCT4046AD,112

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The 74HCT4046AD,112 is an advanced monolithic CMOS Phase-Locked Loop (PLL) integrated circuit designed for clock and timing applications. It is part of the Clock/Timing – Clock Generators, PLLs, Frequency Synthesizers section, and is widely used in today’s electronics products. In this article, we will discuss the application fields of the 74HCT4046AD,112, as well as its working principle.

The 74HCT4046AD,112 is widely used in various applications including linear frequency modulation (LFM), frequency-hopping spread-spectrum (FHSS) systems, digital frequency multiplication, and numerous frequency synthesizers. It is ideal for use in systems requiring fast settling or digital synchronization of oscillators.

As a 4-stage PLL, the 74HCT4046AD,112 is an integrated circuit featuring a wide frequency range and a low cycle jitter. It contains a differentiator, an amplifier, an open-loop comparator, a closed-loop comparator, and two voltage controlled oscillators (VCOs). Its frequency range is typically 2.0 MHz to 24 MHz, and it has a dielectric isolation (DI) rating of 1.7V/mil.

The working principle behind the 74HCT4046AD,112 is relatively simple. First, the signal is supplied to the differentiator, which will convert the signal into a rate of change signal. The signal is then amplified and sent to the open-loop comparator, which will compare it to a reference voltage and output a voltage proportional to the error between the two signals. The error signal is then sent to the closed-loop comparator, which will use the error signal to shift the reference voltage to reduce the error signal.

The two voltage controlled oscillators are connected to the closed-loop comparator. The output signal from the comparator is used to control the frequency of the VCOs by varying the signal supplied to them. As the frequency of the VCOs is adjusted, they will lock onto the desired frequency. This is done through a process of phase-shift and frequency feedback. Once the desired frequency is achieved, the signal is sent to the output port, providing the desired output signal.

In addition to the application fields and working principle described above, the 74HCT4046AD,112 also has several features that make it an ideal choice for various applications. First, its wide frequency range can lock into any required frequency with a maximum cycle jitter of 10 ppm. Additionally, its high DI rating prevents noise and interference from affecting the output signal.

In conclusion, the 74HCT4046AD,112 is an advanced monolithic CMOS Phase-Locked Loop (PLL) integrated circuit designed for clock and timing applications. It is ideal for use in applications like linear frequency modulation (LFM), frequency-hopping spread-spectrum (FHSS) systems, digital frequency multiplication, and numerous frequency synthesizers due to its wide frequency range and low cycle jitter. With its high DI rating and additional features, the 74HCT4046AD,112 is an excellent choice for today’s electronic products.

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