LTC6951IUHF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6951IUHF is an ultra-low jitter multi-output clock synthesizer featuring an integrated voltage-controlled oscillator (VCO). It functions as a low-noise integer-N phase-locked loop (PLL) capable of generating output frequencies ranging from 1.95MHz to 2.5GHz. The device provides five independent outputs, including four CML and one LVDS signal, with programmable delay settings for precise phase alignment. Key performance metrics include an output jitter of 90fs RMS between 12kHz and 20MHz and a normalized in-band phase noise floor of -229dBc/Hz at 250MHz. It supports EZSync and ParallelSync technologies for multi-chip synchronization.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO eliminates external components, simplifying design
• Ultra-low jitter performance: 90fs RMS (12kHz to 20MHz)
• Five independent low-noise outputs (4x CML, 1x LVDS)
• Supports JESD204B Subclass 1 SYSREF generation

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clocking for multichannel JESD204B ADCs and DACs
• Multi-chip synchronization systems requiring EZSync/ParallelSync
• High-performance data acquisition systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix IUHF against the manufacturer's current datasheet to confirm package type and temperature range. Ensure compatibility with the DC2248A-A demonstration board for initial evaluation. Confirm RoHS compliance status through official Analog Devices documentation prior to procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6951 for applications requiring outputs up to 2.5GHz. If the design requires frequencies between 2.5GHz and 2.7GHz, or specific bands like 1.66GHz–1.8GHz, the LTC6951-1 variant should be selected instead. Utilize the LTC6951 Wizard software tool to optimize divider settings and verify jitter performance for the target frequency.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LTC6951 belongs to the Linear Technology (now Analog Devices) family of high-performance clock synthesizers. It is designed to replace discrete PLL and VCO solutions by integrating all necessary components into a single package. The device is commonly paired with high-speed converters in telecommunications and industrial instrumentation sectors.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

For frequencies extending beyond 2.5GHz, the LTC6951-1 serves as the direct functional alternative within the same family. No cross-brand replacements are verified in the provided source material.