849N202CKI-021LF

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The 849N202CKI-021LF clock generator is part of the extensive range of clock generators and timing products designed to meet the requirements of today’s high speed, high performance systems. It is a member of the "Fractional-N" family of high- performance Synchronous Clock Generators (SCG), which combines the features of a conventional Clock Generator with a programmable PLL and digitally controlled delay lines. The clock generator is part of a large family of high-performance Synchronous Clock Generators (SCG), which offer a wide variety of functions such as: frequency synthesis, output clock jitter cancellation, frequency and phase locking, frequency synchronization and a wide range of clock frequencies.

The 849N202CKI-021LF clock generator is a low jitter, low phase noise clock generator designed for applications where high clock accuracy and tight synchronisation are required. It provides a flexible platform for clock distribution, frequency synthesis and jitter cancellation. It also provides a quick and easy way to generate very accurate high frequency clocks and distribute them to various independent devices in the system. With its low jitter and low phase noise performance, the 849N202CKI-021LF is ideal for applications such as test and measurement systems, secure communications, military and aerospace, digital storage and High Definition Television (HDTV).

The 849N202CKI-021LF clock generator features a highly integrated, single chip synchronous clock generator, variable pulse-width modulation and variable delay generation. This enables the device to provide a wide range of configurable clock outputs with very low jitter, high system accuracy and tight synchronization when compared to standard Clock Generators and PLLs. The device can generate clock outputs between 849MHz and 852MHz and provides an output clock duty cycle of 50%.

The 849N202CKI-021LF clock generator operates with a PLL loop frequency that is programmable from <20kHz to 400MHz. The PLL loop is composed of a phase frequency detector, charge pump and a low pass filter integrator. The phase frequency detector compares the output of the PLL loop with an external reference clock and generates an error voltage that is proportional to the phase deviation between the two clocks. This error voltage is then fed to the charge pump, which generates a current that is used to charge or discharge the filter integrator. The voltage at the filter integrator then controls the frequency of the internal VCO, resulting in a phase or frequency lock to the input reference. This makes the PLL loop extremely accurate, allowing for a very narrow capture range and highly precise output clocks.

The 849N202CKI-021LF also features an on-chip Varactor that is used to control the frequency of the VCO, allowing for precise frequency selection. The variable pulse width modulation can be used to vary the duty cycle of the output clocks and provide variable delay generation for different applications. Additionally, the device also features a programmable pulse division factor that can be used to provide exact division ratios from the VCO input. The variable pulse width modulation and pulse division factor can be used in combination to generate precise output frequencies.

The 849N202CKI-021LF is a highly integrated and feature rich device that provides system designers with a versatile and precise clock generation solution, ideal for high speed, high performance applications such as digital storage, HDTV and secure communications. The low jitter and low phase noise performance combined with the precise frequency synthesis and timing control make the 849N202CKI-021LF an ideal choice for those applications in need of highly precise clock distribution and synchronization.

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