5P49V5901B667NLGI8

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The 5P49V5901B667NLGI8 is a fully integrated clock generator which synthesizes lower speed and high performance frequencies using PLL technology. It is a general purpose, cost-effective device providing an ideal solution for timing and system clock applications in various types of systems.

This clock generator offers three independent outputs which allows a broad range of frequencies to be generated from a single internal clock. It provides selectable dividers, multipliers, and select lock cycles which can be applied to generate frequencies from 31.25MHz to 667 MHz, making it applicable for a wide range of applications.

Application Field

The 5P49V5901B667NLGI8 can be used in a wide variety of applications, including digital signal processing (DSP) and communications, video and imaging systems, servers and storage systems, data-center applications, and general-purpose clocks. It has been specifically designed for mobile applications, offering low-jitter outputs that is suitable for low-power environments.

The internal PLL allows the user to select one of the three fully-integrated outputs, configured as a frequency synthesizer, to generate frequencies up to 667 MHz. This makes it possible to use this clock generator in products that rely on a high level of frequency accuracy, such as imaging systems, video streaming technology and HDTV. Each output is separately adjustable to offer flexible clocks for various purposes.

The device also offers an integrated spread-spectrum function, which allows it to reduce its peak EMI emissions, making it suitable for use in products where a low level of conducted emissions is of primary concern. The device also features a tiny 8-pad, 2mm by 2mm package for space savings, making it an ideal choice for applications where board real estate is of concern.

Working Principle

The 5P49V5901B667NLGI8 incorporates two main components in its operation - the input reference oscillator and the phase-locked loop (PLL). The input reference oscillator provides the fundamental frequency of the clock generator and is typically held at a fixed frequency but can also be adjusted using a programmable control interface if desired. The PLL then uses this input reference frequency to synthesize different frequency outputs.

The 5P49V5901B667NLGI8 has an integrated frequency synthesizer that uses this PLL to generate the desired signals in its various outputs. The frequency synthesizer utilizes four components – a fractional-N loop filter, a VCO, a frequency divider, and a phase-frequency detector (PFD) – in order to generate the desired output signals. The fractional-N loop filter, VCO and frequency divider are used to generate the main output frequency. The PFD detects discrepancies between the actual and reference frequencies, and then passes the adjustments through to the loop filter, making corrections as necessary.

In addition to its PLL outputs, the 5P49V5901B667NLGI8 also offers a selectable spread-spectrum function which can be used to reduce peak spurious emission while retaining the same output frequencies as the PLL outputs. This feature adds an additional frequency-dependent shift to each output, reducing the overall peak power at a given frequency.

Conclusion

The 5P49V5901B667NLGI8 is a general purpose, cost-effective clock generator designed to generate low speed and high performance frequencies from 31.25 MHz to 667 MHz with selectable dividers, multipliers and select lock cycles. Available in an 8-pad, 2mm by 2mm package, it is suitable for a variety of different applications, including digital signal processing and communications, video and imaging systems, servers and storage systems, data-center applications, and general-purpose clocks. The integrated PLL and frequency synthesizer ensure accurate and reliable performance, while the spread-spectrum function helps to reduce both peak EMI emissions and power dissipation.