PLL-based clock conditioner for high-speed signal chains
The LMK04010BISQX/NOPB is a clock conditioner from Texas Instruments that integrates a phase-locked loop (PLL) to clean jitter on incoming clock signals. It accepts LVCMOS, LVDS, or LVPECL inputs and outputs 2VPECL or LVPECL, making it a fit for cleaning up reference clocks in high-speed ADC/DAC or FPGA-based systems where phase noise matters.
1.296 GHz ceiling and 2:5 fanout
With a maximum output frequency of 1.296 GHz, this part covers the clock rates needed for 10-Gigabit Ethernet, JESD204B serial links, and high-speed data converters. The 2:5 input-to-output ratio means two input references can be conditioned and fanned out to five output paths, useful for distributing a clean clock across multiple board destinations. The supply voltage range is tight at 3.15 V to 3.45 V, so the power rail feeding this device should be regulated within 5 % — a standard 3.3 V LDO with 1 % tolerance covers it.
The exposed pad is the primary thermal path — the datasheet's recommended land pattern should be followed to keep junction temperature within limits at the 1.296 GHz operating point. Surface-mount assembly with Tape & Reel packaging supports standard pick-and-place. The 48-WQFN package has a 0.5 mm pitch; a solder stencil aperture ratio of 0.8–0.9 for the thermal pad helps avoid voiding during reflow.
The base product number LMK04010 allows parametric filtering for sibling variants with different output formats or temperature grades if the design requires a change.