SI5351A-B04210-GTR

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Clock/timing systems are essential in communication and data processing systems and are used in industries such as aerospace, automotive, defense, networking, and telecommunications. The SI5351A-B04210-GTR is a Clock Generator and Frequency Synthesizer designed for a wide range of applications and provides a low-cost, low-jitter clock signal solution that is ideal for clock synchronous applications that require a fixed-frequency output. This application note discusses the features, application field and working principles of the SI5351A-B04210-GTR.

Features of the SI5351A-B04210-GTR

The SI5351A-B04210-GTR is an integrated, multi-output clock generator with two independent clock outputs and a single programmable PLL-synthesized reference clock output. It provides three outputs at frequencies up to 200MHz with adjustable duty cycles, diverse operating frequencies, and clock duty cycles of 100%. The external 1-kV ESD clamp provides superior protection against electrostatic discharge and power up/down sequences for reliable system operation. The device also features an on-chip programmable Crystal Oscillator, buffered outputs with three-state set/reset capability, and an integrated voltage-controlled oscillator that allows for frequency modulation.

The SI5351A-B04210-GTR has an improved jitter generation compared to the previous versions of the SI5350 series, due to an improved Crystal Oscillator (XO) circuit, and integrated voltage-controlled oscillator. This improvement reduces jitter to 3ps, making it an ideal choice for high-speed, high-performance applications.

Application Field

The SI5351A-B04210-GTR is a multi-purpose clock generator and frequency synthesizer. It can be used in a variety of applications including:

• Embedded computing
• Data Communication
• Networking
• Aerospace
• Industrial control
• Medical Instrumentation
• Automotive
• Avionics

The SI5351A-B04210-GTR is also compatible with numerous other standards, including but not limited to I2C, SPI and UART interfaces, and can be implemented in various analog broadcast formats such as NTSC, PAL, DVI, and HDMI.

Working Principle

The SI5351A-B04210-GTR clock generator utilizes a unique three-stage frequency synthesis architecture: a 2-GHz low-noise XO output, a 2-GHz voltage-controlled oscillator (VCO) that is synthesized by the XO, and a programmable output frequency range of up to 200MHz. The programmable output frequency range is achieved through a combination of the VCO and the internal programmable dividers.

The XO output is used to power the internal VCO, which is designed to provide a low-noise and low-jitter clock signal at the specified output frequency. To select the desired output frequency, a series of dividers are programmed using I2C registers. The VCO output is then connected to the output frequency divider which divides the output frequency to the suitable level based on the user register settings. Finally, the output is buffered by the tuneable output buffers for clean-clock delivery.

The SI5351A-B04210-GTR clock generator is also capable of operating in a number of clock mode. The device can be programmed to operate in the standard output frequency range from 1-200MHz. It can also operate as a dual frequency synthesizer where two independent programmable outputs are generated from a single VCO. The synthesizer also features four frequency dividers that can be used to produce up to four distinct output frequencies.

Conclusion

The SI5351A-B04210-GTR clock generator and frequency synthesizer is designed to provide an efficient, low-cost and low-jitter clock solution for a wide range of applications. It features three outputs up to 200MHz with adjustable duty cycles and diverse operating frequencies, as well as an on-chip, programmable Crystal Oscillator and voltage-controlled oscillator. The device is compatible with I2C, SPI and UART interfaces, and can be configured to operate as a single clock generator or as a dual frequency synthesizer. As such, the SI5351A-B04210-GTR is ideal for embedded computing, data communication, networking, aerospace, defense, automotive, avionics, and medical instrumentation applications.

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