LTC6953IUKG#PBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6953IUKG#PBF is a high-performance, ultralow jitter clock distribution integrated circuit from Analog Devices. It features eleven independent outputs capable of supporting JESD204B/C Subclass 1 SYSREF signal generation. The device operates with an input frequency range up to 4.5 GHz and provides additive output jitter of less than 6 fs RMS (12 kHz to 20 MHz integration bandwidth) at 4.5 GHz. Each output includes individually programmable frequency dividers, coarse digital delays, and fine analog delays for precise phase alignment. The component utilizes EZSync™ and ParallelSync™ protocols for multichip synchronization and is housed in a 52-lead, 7 mm × 8 mm plastic QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Ultralow jitter performance: < 6 fs RMS additive output jitter at 4.5 GHz (12 kHz–20 MHz BW).
• JESD204B/C compliant: Supports Subclass 1 SYSREF generation with flexible output configuration.
• Precise phase control: Individual programmable coarse digital and fine analog delays per output.
• Multichip synchronization: Enables EZSync™ and ParallelSync™ protocols for system-wide alignment.

Clock Generators, PLLs, Frequency Synthesizers Applications

• High-performance data converter clocking
• Wireless infrastructure systems
• Test and measurement equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix #PBF indicates a lead-free finish and tape-and-reel availability options may exist via the #TRMPBF suffix. Confirm the temperature grade label on the shipping container matches the –40°C to 125°C operating junction range specified for the I-grade variant. Ensure the exposed pad (Pin 53) is soldered directly to the PCB ground plane with thermal vias to maintain reliability within absolute maximum ratings.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6953IUKG#PBF when designing systems requiring JESD204B/C Subclass 1 synchronization or low-jitter clock distribution for ADCs and DACs. This part supports up to five device clock/SYSREF pairs plus one general-purpose output. Consider the 52-lead QFN package dimensions (7 mm × 8 mm) and the requirement for direct exposed pad soldering for thermal management during layout.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LTC6953IUKG#PBF belongs to the LTC6953 family of clock distributors. It is designed to work in conjunction with other Analog Devices components such as the LTC6952 and LTC6955 using EZSync or ParallelSync protocols to scale clock distribution across multiple chips. The device is supported by the LTC6953Wizard software design tool for register configuration and timing analysis.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current alternative recommendations if this specific package or suffix is unavailable.