873995AYLFT

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873995AYLFT Application Field and Working Principle

Clock/timing solutions like 873995AYLFT are used in a wide range of applications to provide precise and stable timing solutions. 873995AYLFT is a high performance clock and timing system with a versatile PLL (phase-locked loop) based frequency synthesizer designed for use in industrial, embedded, and telecom applications.

873995AYLFT solutions can generate a variety of frequencies from a single crystal, allowing customers to easily generate the required application clock signals. The output clock frequency of 873995AYLFT can be adjusted from 0.3 to 150 MHz with the programmed clock divider. The output clock frequency can also be adjusted with the clock multiplier, which is adjustable from 4x to 16x the reference clock frequency. Furthermore, the 873995AYLFT also features an integrated phase-frequency-locked loop, which enables the frequency of the phase-lockedloop output to be quickly locked to the desired frequency with high precision and stability.

The phase-locked loop (PLL) circuit of 873995AYLFT is based on a traditional four-stage topology of frequency synthesizer to fill the gap between a numerically-controlled oscillator (NCO) used in low-frequency applications and a digital-frequency synthesizer used in high-frequency applications.

An NCO typically produces reference frequency using a combination of an oscillator and a CORDIC (Coordinate Rotation Digital Computer) which can be controlled by digital commands. This combination has the inherent advantage of low power consumption and high resolution capability, which makes it an ideal choice for low-frequency applications. However, for applications beyond 200 MHz, an NCO system can become inefficient and complex, due to the limited resolution of the CORDIC. In this case, the 873995AYLFT PLL system offers an ideal solution

The 873995AYLFT consists of a low-noise fractional-N frequency synthesizer which is able to generate stable clock selections with frequencies ranging from 0.3 to 150 MHz. It targets applications such as ADSL, XDSL, cable modems, cable/DSL/VOIP routers, industrial controllers, digital instrumentation, and medical imaging.

The 873995AYLFT PLL works on the basis of a four-stage architecture consisting of an external VCO, a frequency divider, a phase/frequency detector, and a loop filter. The external VCO contains a voltage controlled oscillator that produces an output frequency, which is divided down internally by a programmable frequency divider. This output frequency is then used to drive a phase/frequency detector, which compares the reference clock frequency entering the system with the divided VCO output frequency.

In addition, the 873995AYLFT provides precise and reliable frequency selection by providing CML (current mode logic) outputs with integrated pull-up resistors. These integrated pull-up resistors ensure accurate logic level regardless of load variations, while the adjustable settling time allows the device to provide precise data capture of clock pulses.

The 873995AYLFT also feature a wide range of digital output options, such as inputs, outputs from 1.2V up to 3.3V, and outputs from 1.2V up to 5V. The on-chip digital control pins allow for easy connection of external logic devices for further customization of the 873995AYLFT system\'s operation. The device also offers integrated digital slewing and slew-rate control, allowing customers to easily select the optimal settling time for their application.

Overall, 873995AYLFT provides a reliable and cost-effective solution for clock and timing applications. The integrated PLL and low-noise frequency synthesizer of 873995AYLFT makes it an ideal choice for sensitive and complex clock management applications and in combination with its various digital output options, makes it the ideal choice for any clocking application.

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