5P49V5914B523NLGI

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Modern clock generators, PLLs and frequency synthesizers provide a variety of timing functions and provide a low jitter solution for precision timing requirements in a wide range of applications. Many new clock designs incorporate advanced features such as low phase noise, low skew in-circuit operation, and jitter attenuation. This article will discuss the 5P49V5914B523NLGI application field and working principle.

Application Field of 5P49V5914B523NLGI

5P49V5914B523NLGI is a highly integrated 4GHz clock generator and jitter attenuator in a tiny 2.2 x 2.2 mm package. It is designed to work at optical communication line rate of up to 4.25Gbps. The device provides a very low jitter output signal of 100fs RMS and extremely low phase noise of ñ82 dBc/Hz@12kHz for clock rate up to 4GHz. The 5P49V5914B523NLGI has a wide input frequency range from 100MHz to 500MHz and is ideal for high-speed applications in various communication systems and embedded applications.

Working Principle of 5P49V5914B523NLGI

The 5P49V5914B523NLGI uses a fractional-N PLL, which combines the stability of the integer-N approach with the flexibility of a fractional-N architecture. By using a reference frequency divider, the reference frequency multiplied by any fractional increment, up to 10 stages of digital modulation resolution, produces a stable, low jitter output frequency. The power consumption of the 5P49V5914B523NLGI is also very low, typically below 15mW during normal operation. The device includes on-chip phase detectors, pulse generators, dividers, and control circuitry that allows the device to operate without the need of additional components. The device also includes a synthesizer circuit to regulate the output frequency.

The 5P49V5914B523NLGI features a low jitter phase locked loop (PLL) architecture that provides a very low jitter output clock with phase noise of ñ82dB$c/Hz@12kHz for clock rate up to 4GHz. The device can synchronize to an external reference clock with a cycle-to-cycle jitter of 7pspp. The device also provides an onboard voltage-controlled oscillator for generating a low jitter internal clock with cycle-to-cycle jitter of 50fspp. The 5P49V5914B523NLGI also has an on-chip spread-spectrum clock generator that enables it to comply with FCC and EMC regulations while providing a low jitter output clock.

Conclusion

The 5P49V5914B523NLGI is a highly integrated 4GHz clock generator and jitter attenuator in a tiny 2.2 x 2.2 mm package. It is designed to work at optical communication line rate of up to 4.25Gbps. The device provides a very low jitter output signal of 100fs RMS and extremely low phase noise of ñ82 dBc/Hz@12kHz for clock rate up to 4GHz. It also features a low jitter PLL architecture that can synchronize to an external reference clock with a cycle-to-cycle jitter of 7pspp and an onboard voltage-controlled oscillator with a cycle-to-cycle jitter of 50fspp. The 5P49V5914B523NLGI is ideal for high-speed applications in various communication systems and embedded applications.

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