P2781AF-08SR Integrated Circuits (ICs)

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P2781AF-08SR is a Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers device. It is an ultra low jitter, low power clock generator with a spread-spectrum output, and is suited for the communications, networking and data storage markets. The device offers best-in-class jitter performance and utilizes a low-cost hermetic packaging.

Application Field:

Due to its low jitter and low power performance, P2781AF-08SR is widely used in communications, networking and data storage applications. Its low-cost hermetic packaging makes it suitable for cost and space-sensitive applications, such as ASIC designs, where performance is still critical. Some other application fields include: industrial control, computer and peripheral systems, microwave synthesisers, wireless LAN, and optical transmission systems.

Working Principle:

The P2781AF-08SR utilizes a PLL-based architecture. It generates an output frequency that is an integral multiple of an input reference frequency, which is derived from an external reference oscillator. The output frequency of the device can be adjusted by programming a Table Top (word) Register. The device has a wide frequency range, low power consumption and low jitter performance.

The PLL-based architecture is based on the VCO (Voltage Controlled Oscillator) open loop vector architecture. The vector loop bandwidth is adjustable and provides optimal tuning capability over the entire frequency range. The high-performance PLL loop incorporates a Programmable Phase Locked Loop (P-PLL) that employs a digital frequency synthesizer, programmable loop bandwidth and gain, and a spread-spectrum output. The P-PLL architecture is designed to provide excellent jitter and noise performance while requiring low power consumption. The device also features an adjustable output spread and frequency control.

The P2781AF-08SR also features integrated compensation circuitry, which allows for better jitter performance and lower output noise. The integrated compensation circuit compensates for any phase shift or frequency offset that may be introduced by the system’s reference oscillator or external components. The device also includes programmable output drive and sequence, allowing for ease of implementation in high-rates clock chains and clock domain crossing applications.

Conclusion:

The P2781AF-08SR is an ultra low jitter, low power clock generator with a spread-spectrum output, which is suitable for cost-sensitive applications in the communications, networking and data storage markets. The device offers best-in-class jitter performance and utilizes a low-cost hermetic packaging. It utilizes a PLL-based architecture, which is based on the VCO open loop vector architecture. The device also features integrated compensation circuitry, programmable loop bandwidth and gain, and a spread-spectrum output. It is an ideal choice for applications such as industrial control, computer and peripheral systems, microwave synthesizers, wireless LAN, and optical transmission systems.

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