CD74HC4046AM

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The CD74HC4046AM is a silicon, low-power consumption CMOS PLL designed for clock and timing applications. It provides a single-ended output and has a frequency bandwidth of 3.0 MHz to 12.0 MHz. The PLL consists of a Phase/Frequency Detector (PFD), Voltage-Controlled Oscillator (VCO), a Programmable Divider, and a fast current source. It is also programmable and is compatible with the popular 2.5 V/3.3 V LVCMOS/LVDS logic families.

The primary application field of the CD74HC4046AM is in clock and timing applications, such as frequency synthesis, clock generators, phase-locked loops (PLLs), while its working principle consists of a phase/frequency detector (PFD), voltage-controlled oscillator (VCO), and a programmable divider.

The phase/frequency detector (PFD) measures the frequency and phase difference between an input clock signal and the feedback signal from the divider. This difference is used for the control voltage of the voltage-controlled oscillator, which is typically a phase-locked loop (PLL) based on a suitable linear IC.

The voltage-controlled oscillator (VCO) is responsible for generating an output frequency based on a control voltage, which is applied by the PFD. In most applications, the output is then fed back to the divider to form a loop (closed-loop operation). This loop is always the negative feedback of the PLL.

The programmable divider is the last component of the CD74HC4046AM. Its primary role is to divide down the output frequency of the VCO to a lower frequency as required by the system. This is important because most systems require somewhere to adjust the VCO\'s output frequency by varying the divider ratio. The divider is programmable, allowing it to divide the output frequency by a controlled amount.

The CD74HC4046AM is suitable for use in multiple clock and timing applications including frequency synthesis, clock generators, and phase-locked loops. The PLL is also programmable and is compatible with a variety of logic families such as 2.5V / 3.3V LVCMOS / LVDS. Additionally, its low-power consumption makes it a great choice for applications where low-power consumption is important.

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