844021BG-01LFT

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The 844021BG-01LFT is a clock generator, phase-locked loop (PLL), frequency synthesizer designed by Silicon Labs. This device provides a highly-accurate, low-jitter synchronous clock that can be tuned to meet design requirements for precision systems.

Application Field

The 844021BG-01LFT is suitable for frequency synthesizers and high-performance clock synchronization applications where great accuracy is required. It is well-suited for clock-signal generation and synchronization in high-speed precision clocks, satellite communications, network-interface cards, video-recording and broadcast systems, cable TV, and cellular base-station infrastructure.

Working Principle

The 844021BG-01LFT contains a voltage-controlled oscillator (VCO) with an integrated fractional-N PLL. This combines the best features of both fractional-N and integer-N PLLs. The VCO is controlled by a phase-frequency detector and a digital loop filter. This digital loop filter helps to along with the VCO provide low phase-noise and fast-locking. The fractional-N PLL tracks even the most aggressive input frequency steps and changes. All these features make the 844021BG-01LFT ideal for applications that need very accurate output frequencies and tight phase-noise performance.

The high performance of the 844021BG-01LFT can be achieved thanks to the integrated charge-pump circuit, which allows for greater loop stability than typical integer-N PLLs, and the use of advanced temperature-compensation techniques for better long-term frequency stability.

The 844021BG-01LFT supports very fast start-up times and can switch from one output frequency to another within a few milliseconds. It is capable of using both single- and multi-VCOs, and can achieve a wide range of output frequencies, from 0.5 to 400MHz, with very low-jitter. It can also be used to tune the output frequency in a range of applications, such as OCXO frequency control.

Conclusion

The 844021BG-01LFT is a clock generator, phase-locked loop (PLL), and frequency synthesizer designed to provide low-jitter, precision clocking suitable for a wide range of applications. The device features a fast-locking, high-performance fractional-N PLL, an integrated charge-pump circuit, and advanced temperature-compensation techniques for greater loop stability. The 844021BG-01LFT supports very fast start-up times and is capable of reaching output frequencies from 0.5 to 400MHz, with very low-jitter. It provides a great solution for applications that require high accuracy and tight phase-noise performance.

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