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Linear Technology introduces low phase noise integer N-frequency synthesizer core core

feb 6 2015 2015-02 Connectors Linear Technology/Analog Devices
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Linear Technology Corporation introduces the low phase noise integer N-frequency synthesizer core, the LTC6950, with components with ultra-low jitter frequency allocation outputs. The LTC6950 is an ideal solution for generating and distributing low-jitter signals, which are key to timing data converters at a high signal-to-noise ratio (SNR).

     Linear Technology Corporation introduces the low phase noise integer N-frequency synthesizer core, the LTC6950, with components with ultra-low jitter frequency allocation outputs. The LTC6950 is an ideal solution for generating and distributing low-jitter signals, which are key to timing data converters at a high signal-to-noise ratio (SNR). Suitable for operation in the contact temperature range of -40℃ to 105℃. Adopts 5mm x 9mm, 48 pin plastic QFN package

     Maintaining low jitter at data converter frequencies is fundamental to achieving excellent SNR when digitizing or synthesizing high analog frequencies. For example, modern electronic systems require the use of ADCs to directly digitise RF and high IF signals via 18fsRMS jitter (at 12kHz to 20MHz bandwidths). The LTC6950 guarantees optimum performance in such systems.

     The LTC6950 uses Linear Technology's patented EZSync output synchronization, which is a simple, efficient way to edge synchronize multiple outputs from one or more chips. EZSync synchronization aligns the rising edge by simply determining the common CMOS input, which has relaxed timing requirements. For this functionally-enabled component, EZSync synchronization is also applied to provide repeatable and deterministic phase relationships between its frequency divider outputs.

     The phase-locked loop (PLL) in the LTC6950 has an excellent normalized in-frequency phase noise benchmark, or -226 DBC /Hz quality factor, and a very low normalized 1 /f phase noise of -274 DBC /Hz, which remains intact across the frequency allocation range. These specifications ensure that designers can take full advantage of the good phase noise performance of the external oscillator locked by the LTC6950 and provide the best jitter performance in its class.

     To simplify the design process for the LTC6950, Linear Technology also offers free ClockWizard simulation and design tools. The ClockWizard GUI can grasp the component values of the loop filter with a single button click and accurately predict the phase noise and jitter of each output to assist designers in making correct choices during the design and debugging phases.

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