SI5351A-B02075-GT

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Part Status:	Active
Moisture Sensitivity Level (MSL):	--

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Overview

The SI5351A-B02075-GT clock generator from SiTime is a synthesis-based clock generator developed for applications requiring high-precision clocks with low jitter and flexible configuration. It is a low-power, high-accuracy, low-jitter, clock generator and is highly effective for generating precise, repeatable jitter-free clocks in any frequency and desired combination across multiple clock outputs. This makes it a great choice for applications such as telecom and networking, telecom infrastructure, data communications, high speed interface communication, and more. In this article, we will discuss the application field of the SI5351A-B02075-GT and its working principle.

Application Field

The SI5351A-B02075-GT is designed to be used in a wide range of clock generator applications including telecommunications, datacom/networking, automotive, high speed interface communication and general clock synthesis for any microprocessor or digital logic application. It is also suitable for applications that require precise clock synchronization, jitter reduction in multiple clock outputs, and programmable clock frequencies.The SI5351A-B02075-GT is an ultra-low power clock generator that can generate clock frequencies from 0Hz to 200 MHz with superior accuracy, phase noise, and jitter performance. It is capable of providing up to 8 outputs with phase-lock loop (PLL) frequency synthesis and convenient individual output frequency programming and optional selectable output formats. The device supports low voltage differential signaling (LVDS) up to 150 MHz and provides additional output swing for pulse-width modulation (PWM) and pulse-density modulation (PDM) outputs. The device also features a fully integrated phase-locked loop (PLL), which provides excellent frequency stability, low phase noise, and low jitter, as well as an integrated low-noise, high PSRR regulator to ensure stable output performance in the most challenging of applications. The device has single supply operation from 1.8V to 4.9V, low power consumption of just 1.8 mW and only 120 μA in standby mode, making it suitable for battery-powered applications.

Working Principle

The SI5351A-B02075-GT works using a suite of synthesis-based-clock generation (SBCG) algorithms to generate and deliver precise and repeatable clock signals across multiple outputs. This allows it to produce extremely low jitter, low-noise clock signals. The SI5351A-B02075-GT consists of three independent multiphase PLLs, a reference clock divider and a programmable digital oscillator circuit, collectively called the SBCG block. The three PLLs generate three independent clocks. The reference clock divider divides it into multiple clock frequencies, and the programmable digital oscillator circuit takes the multiplied clock signal and produces the desired clock frequency.The PLLs are responsible for producing precisely timed, low-jitter, clock signals. The first PLL uses the reference clock frequency to generate frequencies for divide by 1,4,8 and 16, the second PLL generating frequencies for divide by 32,64,128, and 256, and the third PLL for divide by 512, we can adjust the PLL settings to get any frequency from 0-200MHz.External reference frequencies are used to achieve low jitter. The device can accept differential or single-ended input reference clocks as low as 10MHz. Other options include a programmable input frequency, a programmable output frequency, an optional output frequency selectable, and a crystal-controlled reference frequency input.Using the integrated SBCG block, the SI5351A-B02075-GT can generate up to eight clock outputs in different frequencies that have extremely low jitter and phase noise. The device can also generate multiple PLL frequencies, allowing the user to achieve higher synthesis accuracy and precision.

Conclusion

The SI5351A-B02075-GT is an ideal clock generator for applications requiring ultra-low power, excellent accuracy, superior phase noise and jitter performance, and flexible configuration. It has a suite of synthesis-based clock generation algorithms and features an integrated PLL, reference clock divider and a programmable digital oscillator for maximum performance and accuracy. The device is suitable for a variety of clock generator applications, ranging from telecommunications and datacom/networking to automotive and high speed interface communication.

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