LTC6951IUHF-1

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6951IUHF-1 is a high-performance, low-noise integer-N phase-locked loop (PLL) clock synthesizer manufactured by Analog Devices. It features an integrated voltage-controlled oscillator (VCO) that eliminates the need for external components and internal calibration ensures correct output frequency without external system support. The device provides five independent low-noise outputs with individual dividers, supporting frequencies from 2.1MHz to 2.7GHz. It includes EZSync and ParallelSync capabilities for multi-chip synchronization and generates SYSREF signals compliant with JESD204B Subclass 1 standards.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO with ultra-low jitter: 90fs RMS (12kHz to 20MHz) and -229dBc/Hz normalized in-band phase noise.
• Five independent low-noise outputs: Four CML outputs and one LVDS output with programmable delay for precise phase alignment.
• Multi-chip synchronization: Supports EZSync and ParallelSync technologies for coherent systems.
• Extended frequency range: Output frequencies span 2.1MHz to 2.7GHz, suitable for high-speed ADC/DAC clocking.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clock generation for multichannel JESD204B ADCs and DACs.
• SYSREF signal generation for JESD204B Subclass 1 implementations.
• High-performance test and measurement equipment requiring low-phase-noise clocks.
• Telecommunications infrastructure utilizing synchronized multi-chip architectures.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix IUHF-1 against the official Analog Devices datasheet to confirm package type and temperature range. Ensure compatibility with the DC2248A demonstration board for initial evaluation. Confirm RoHS compliance status through the manufacturer's environmental documents before integration into production designs.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6951IUHF-1 over the standard LTC6951 when output frequencies between 2.5GHz and 2.7GHz are required. The -1 variant extends the upper frequency limit compared to the base model. Consider the QSOP-16 or similar available packages depending on PCB layout constraints. Use the LTC6951 Wizard software tool to optimize divider settings and verify jitter performance for the target application.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LTC6951 series belongs to Analog Devices' portfolio of ultra-low jitter clock synthesizers. The -1 suffix denotes a variant with an extended output frequency range up to 2.7GHz, whereas the standard LTC6951 supports up to 2.5GHz. Both variants share the same core architecture featuring an integrated VCO and five-output configuration, designed primarily for demanding data converter applications.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. The standard LTC6951 serves as a lower-frequency alternative within the same family. Designers requiring frequencies above 2.5GHz must specifically select the -1 variant; generic replacements are not documented.