SI5351A-B05517-GT

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers encompass a broad range of technologies designed to both generate and distribute clock and timing signals. As consumers’ demand for increased system performance increases while technology nodes shrink, the need for higher precision clocks and timing systems improves, too. The SI5351A-B05517-GT is a sophisticated clock generator and phase-locked loop (PLL) IC that offers a wide range of applications for addressing challenging frequency synthesizer and PLL designs. This document will provide a detailed overview of the SI5351A-B05517-GT, its applications and its working principle.

Overview of the SI5351A-B05517-GT

The SI5351A-B05517-GT is a highly integrated device that utilizes the latest PLL and DLL technologies to offer a high-performance clocking solution for high-performance applications. The device is optimized for operation over a wide temperature range, from -40°C to +100°C, and provides +2.5V and +1.8V output voltages, making it suitable for low-power operating environments. The SI5351A-B05517-GT is packaged in an 8mm x 8mm QFN, and is optimized for single- and dual frequency applications, making it highly adaptable for most industrial and consumer applications.

The SI5351A-B05517-GT features Digital Synthesizer technology which provides the user with more flexibility to customize the device’s output frequency and duty cycle. The device has eight user-selectable output frequencies ranging from 120MHz to 1GHz, with a spectral purity of –112 dBc/Hz. It features integrated voltage-controlled oscillators (VCOs), charge-pumps, and low-noise reference oscillators, as well as programmable dividers, dividers with offset and synchronization outputs, and a PLL with a fast reference clock. This device also offers additional features such as a thermal sensor, a flexible output enable/disable feature, integrated power-down, and multiple output banking configurations.

Applications of the SI5351A-B05517-GT

The SI5351A-B05517-GT is ideal for consumer and industrial applications that require reliable, high-performance clocking solutions. The integrated Digital Synthesizer and automatic reference-locked feature of the device make it suitable for a wide range of consumer applications such as networking equipment, VoIP phones, set-top boxes, and other consumer/industrial systems that require dynamic frequency control. The device also provides high immunity against impulsive noise, making it an ideal solution for automotive and industrial application.

The SI5351A-B05517-GT is also suitable for a variety of base-station and RF applications, such as point-to-point link clocking, wide band and wireless networks, microwave links, wireless local loop, VSAT, and other communications systems. The SI5351A-B05517-GT provides excellent jitter performance and is compatible with most radio instrumentation, making it well-suited for LTE base-station designs. The robustness of the device also makes it suitable for HF and microwave applications such as amateur-radio transceivers.

Working Principle of the SI5351A-B05517-GT

The incorporated Digital Synthesizer of the SI5351A-B05517-GT is the key component that enables the device to accurately generate complex frequency output. This Digital Synthesizer can be configured to support up to eight independent frequency outputs, each with a resolution of eight bits up to 200MHz, or 15 bits up to 1GHz.

The SI5351A-B05517-GT also incorporates high-performance PLL and digital locked loop technologies that enable the device to lock onto a reference frequency rapidly, even in environments such as automotive systems with multiple noise sources. The Phase Detector (PD) of the PLL is optimized for low phase-noise operation, allowing a low cycle-to-cycle, and fast locking time. The device also has the provision to allow the frequency offset to be adjusted to compensate for the effect of temperature and frequency drift.

The SI5351A-B05517-GT features a low-noise reference oscillator operating between 10MHz and 25MHz, as well as an optional crystal reference oscillator operating between 10MHz and 30MHz. The reference oscillator allows the device to rapidly lock with a wide range of input external reference sources. The input reference frequency is also filtered and tracked with two sample and hold circuits, giving the device a high immunity to noise.

The SI5351A-B05517-GT also features an integrated crystal oscillator that can be used as a reference clock source, allowing the device to continuously ringer the oscillator without any manual intervention. This crystal oscillator has a wide bandwidth of 60MHz to 300MHz, and is coupled to the VCO and output frequency synthesizer via an analog-to-digital phase detector and a programmable charge pump.

The output frequency of the device is determined by the feedback from the phase detector and the charge pump, allowing it to quickly and accurately settle to the desired output frequency. The device also ensures the maximum linearity of the synthesized frequency, by continually updating the charge pump current over a wide range of frequencies, and keeping the phase error within a static timing window.

Conclusion

The SI5351A-B05517-GT is an ideal clock generator and PLL IC for a wide range of industrial and consumer applications, providing high performance and flexibility, superior jitter performance, and immunity to noise. The Digital Synthesizer technology allows the user to program the device to generate multiple output frequencies with a resolution of eight bits up to 200MHz, or 15 bits up to 1GHz. The integrated PLL, VCOs and charge-pumps, allow the device to lock-on quickly and accurately to a wide range of reference frequencies. The device also has an integrated crystal oscillator, allowing it to automatically re-lock and change the output frequency without manual intervention. The SI5351A-B05517-GT is a highly integrated, robust and versatile device, providing a wide range of solutions for addressing challenging frequency synthesis and PLL designs.

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