LMX2531LQ1146E/NOPB

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LMX2531LQ1146E/NOPB is a multi-modal clock generator and clock multiplier IC developed by Texas Instruments. This device is used to generate and manipulate a wide range of frequencies and is used especially in high-speed communication applications. It features an array of features such as wide frequency range, low power operation, programmable output formats and superb jitter performance.

The LMX2531LQ1146E/NOPB operation begins with a low-noise reference clock. This reference clock is preprocessed by a chain of digital filters and frequency discriminators prior to going through a low-noise frequency-locked loop (FLL) system. This FLL system ensures the reference clock is locked accurately. The output from the FLL system is then multiplied and divided by the output dividers and multipliers to generate the output frequencies. The dividers and multipliers are programmable to achieve a wide array of operating frequencies and to enable the user to select an output frequency better tuned for a given application.

The LMX2531LQ1146E/NOPB also integrates an advanced jitter-removal circuit which further reduces the jitter from the output frequency. This jitter-removal circuit is composed of two time-based digital filters each with a second order jitter-removal filter block. The total jitter reduction achieved is up to 10dB.¹

Apart from the clock multiplier block and the jitter-removal block, the LMX2531LQ1146E/NOPB also includes a timing-processing circuit. This timing-processing circuit includes a fully programmable write clock generator, a broad set of programmable clock distribution and gating functions, and dedicated clock synchronization capabilities. The timing-processing circuit helps to synchronize the input and output clocks throughout the entire system. It is designed to provide noise immunity and a wide variety of reference clock options.

The LMX2531LQ1146E/NOPB is a versatile clock generator and clock multiplier IC used in a wide range of applications. It is suitable for telecom, datacom, high-speed serial links (e.g. Fibre Channel, Ethernet, Gigabit Ethernet), as well as computer and storage systems. It is designed to be used in a variety of conditions and to provide a high output frequency accuracy and minute jitter.

¹ Texas Instruments, LMX2531 Datasheet.

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