LTC6954IUFF-3

Clock Buffers, Drivers Overview

The LTC6954IUFF-3 is a low phase noise clock distribution divider and driver featuring three independent outputs. It provides one LVPECL output and two jumper-selectable LVDS or CMOS outputs. The device supports input frequencies up to 1.8 GHz for LVPECL, 1.4 GHz for LVDS, and 250 MHz for CMOS. Each output includes an individually programmable integer divider (1–63) and delay (0–63 cycles). Powered by a single 3.3V supply (3.15V–3.45V), it operates from -40°C to 105°C in a 36-lead QFN package.

Clock Buffers, Drivers Feature Summary

• Three independent outputs: One LVPECL and two LVDS/CMOS selectable via OUTxSEL pins
• Individual programmable frequency dividers (1–63) and delays (0–63 cycles) per output
• Low additive jitter: 17 fs RMS (LVPECL, 1400MHz) and 18 fs RMS (LVDS, 1400MHz)
• SPI-compatible serial control for all settings including EZSync synchronization

Clock Buffers, Drivers Applications

• Clock distribution for high-speed/high-resolution ADCs
• Low jitter clock generation for DACs
• Data acquisition systems requiring synchronized multi-channel clocks

Clock Buffers, Drivers Procurement Notes

Verify the suffix 'I' indicates the industrial temperature range (-40°C to 105°C). Confirm the '-3' designation matches the required output combination of one LVPECL and two LVDS/CMOS channels. Ensure the UFF package type aligns with PCB footprint requirements. Check for specific ordering suffixes like #PBF or #TRPBF if lead-free or tape-and-reel packaging is needed.

Clock Buffers, Drivers Selection Notes

Select this variant when one differential LVPECL output and two flexible LVDS or CMOS outputs are required. Choose over LTC6954-1 if LVDS/CMOS flexibility is needed instead of three LVPECL outputs. Consider power consumption differences between LVDS modes (3.5mA vs 7mA) and termination requirements. Verify input signal levels match LVCMOS, LVDS, or LVPECL standards.

Clock Buffers, Drivers Part Context

The LTC6954 family consists of four variants differing only in output logic types. The IUFF-3 specifically combines one LVPECL driver with two drivers that can be configured as either LVDS or CMOS via external jumpers. This offers mixed-signal flexibility compared to the uniform output configurations of the -1, -2, and -4 models.

Clock Buffers, Drivers Replacement Considerations

LTC6954IUFF-1 provides three LVPECL outputs. LTC6954IUFF-2 provides two LVPECL and one LVDS/CMOS output. LTC6954IUFF-4 provides three LVDS/CMOS outputs. Direct pin-to-pin replacement requires matching the output logic configuration needs.