SI51218-A07909-GM

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SI51218-A07909-GM Clock Generators, PLLs, Frequency Synthesizers in Application Fields and Working Principle

Introduction

Clock Generators, PLLs and Frequency Synthesizers, also known as “clock chips”, are digital electronic circuits which are used to generate, adjust and store a digital frequency signal they are given, usually from the 40 KHz to 1100 MHz frequency range. Most of the times they are used to synchronize devices and applications by distributing a single time and frequency signal to a variety of different sources.The SI51218-A07909-GM clock chip, is a low-cost, high-performance Dual-Output, Programmable Clock generator solution with integrated loop filter. It is a highly configurable device that can be used to create a safe, reliable and robust synchronization scheme.

Application Fields

The SI51218-A07909-GM dual clock generator is highly suitable for a wide variety of applications, such as:

• High-Speed Cabling and Connectivity.
• Networking Infrastructure
• Telecommunication Infrastructure
• Test & Measurement Instruments
• Down Hole & Aerospace Equipment
• Data Storage Solutions
• Military and Industrial Applications
• Broadcast Television and Radio
• Medical Equipment

The use of this chip in the mentioned applications afford datacom system designers the ease of integrating aDual Clock generators in their clock solutions.

Features & Benefits

The SI51218-A07909-GM clock chip provides a high degree of customization, flexibility and scalability.

• High-Frequency Output: generates outputs from 80MHz to 800MHz in 0.25 or 0.5 steps, making it ideal for a large variety of applications
• Low Jitter Output: the jitter performance for single-ended outputs allows for an improvement in BER (Bit Error Rate)
• High-Speed: can achieve update speeds of up to 26 MHz while consuming minimal power
• Programmable Synthesizer: chip’s internal oscillator can be reprogrammed to suit the needs of any application
• Integrated Loop Filter: it contains a programmable LPF (Low-Pass Filter) that used to set loop bandwidth autonomously
• Output Enable: the output can be enabled and disabled with a single bit setting thanks to its integrated outputs
• Wide Temperature Range: the chip can be used in temperatures ranging from -40°C to 85°C

Working Principle

The SI51218-A07909-GM frequency synthesizer, like any other clock chip, is built on a set of different components and sub-tasks which help the chip to generate and adjust its signal output.

VCO & Divider

The main component of any clock chip is the Voltage Controlled Oscillator (VCO). This oscillator is in charge of generating the output signal when given a voltage input. Inside the VCO there is a number of frequency dividers in charge of dividing the harmonics of the signal generated by the oscillator. This is achieved by using digital frequency divider blocks according to the given input voltage.

Phase-Locked-Loop (PLL)

The PLL is the most accountable component of the chip as the functionality of the entire device depends on it. It\'s composed by digital control logic, a phase detector (PD) and a charge pump (CP). The input of the PD is measured by a reference signal, which, in the case of the SI51218-A07909-GM, comes from the Host/DAC. The PD compares the phases of the reference signal to the frequency output from the VCO and gives an output signal to the charge pump. Finally, the charge pump takes the output and provides it to the VCO voltage control input.Thanks to this loop, the chip is able to lock onto the reference signal and generate a signal whose output is synced or in harmony with the other signals from the source.

Integrated Loop Filter (LPF)

The integrated Loop Filter consists of a 7-bit register that is programmed through SPI port. This filter serves to set the loop bandwidth autonomously to the exact value needed to achieve better timing jitter in both multiplexing and stand-alone applications.

Output Enable

The SI51218-A07909-GM contains a 3-bit register that is set through pins. This register is in charge of enabling/disabling each output, giving the user the flexibility of using the chip in different sets up and spaces while consuming less power.

Conclusion

The SI51218-A07909-GM clock chip is a highly configurable and robust device, it provides designers the security and comfort of in the implementation and customization of complex frequency synthesis applications.Its great flexibility offers system designers the opportunity to configure the device according to the needs of any application, while its small size, efficiency and low-cost make it suitable for a wide variety of uses.

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