LTC6952IUKG#PBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6952IUKG#PBF is a high-performance, ultralow jitter clock generation and distribution IC supporting JESD204B/C standards. It features an integrated Phase Locked Loop (PLL) core with a reference divider, phase-frequency detector, ultralow noise charge pump, and integer feedback divider. The device provides eleven independent outputs, configurable as up to five JESD204B/C Subclass 1 device clock/SYSREF pairs plus one general-purpose output, or eleven general-purpose clocks. Each output includes individually programmable frequency dividers and drivers. Key electrical parameters include a maximum output frequency of 4.5 GHz, a reference input frequency up to 500 MHz, and additive output jitter of less than 6 fs RMS (12kHz to 20MHz integration bandwidth at 4.5 GHz).

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Ultralow jitter performance with additive output jitter < 6 fs RMS (12kHz to 20MHz) and –229 dBc/Hz normalized in-band phase noise floor.
• Eleven independent low-noise CML outputs with individually programmable frequency dividers, coarse digital delays, and fine analog time delays.
• Supports JESD204B/C Subclass 1 synchronization via EZSync™ and ParallelSync™ protocols for multi-chip alignment.
• Integrated PLL core with a programmable charge pump current range of 0.423 mA to 11.2 mA and a VCO frequency range up to 4.5 GHz.

Clock Generators, PLLs, Frequency Synthesizers Applications

• JESD204B/C Subclass 1 SYSREF signal generation for high-speed data converters.
• Low noise integer-N PLL clock synthesis for wireless infrastructure.
• High performance data converter clocking in test and measurement equipment.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature range. The #PBF suffix indicates lead-free finish and RoHS compliance. Confirm availability status directly with authorized distributors, as supply conditions may vary. Ensure the procurement channel provides valid traceability documents consistent with Analog Devices Inc. specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing systems requiring precise phase alignment across multiple devices using JESD204B/C Subclass 1. The LTC6952IUKG#PBF is suitable for applications needing up to eleven synchronized outputs with programmable delays. Consider the 52-lead QFN package constraints and thermal requirements, as the exposed pad must be soldered to the PCB ground plane. Verify that the system's reference input frequency does not exceed 500 MHz and that the VCO input supports the required frequency range up to 4.5 GHz.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LTC6952 belongs to Analog Devices' family of high-performance clock generators designed for demanding communication and data acquisition applications. It is distinct from lower-output-count synthesizers by providing eleven fully independent outputs with dedicated delay controls. The IUKG package designation identifies the 52-lead (7mm × 8mm) Plastic QFN form factor used in this specific part number.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate alternative clock synthesizers based on output count, jitter specifications, and JESD204B/C support compatibility if direct replacement is required.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the LTC6952?

The maximum differential output frequency is 4.5 GHz when configured in Clock Mode (MODEx = 0).

How many outputs can be configured for JESD204B/C Subclass 1 operation?

Up to five outputs can be configured as JESD204B/C Subclass 1 device clock/SYSREF pairs, with the remaining outputs available as general-purpose clocks or additional SYSREF signals.

What is the specified additive output jitter for the LTC6952?

The additive output jitter is less than 6 fs RMS with an integration bandwidth of 12 kHz to 20 MHz at an output frequency of 4.5 GHz.