LMK04001BISQ/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMK04001BISQ/NOPB is a low-noise clock jitter cleaner from the LMK04000 family, utilizing a cascaded PLLatinum architecture. It operates within an industrial temperature range of -40°C to +85°C and requires a supply voltage between 3.15 V and 3.45 V. The device features a VCO tuning range of 1430 MHz to 1570 MHz and supports input frequencies up to 400 MHz for PLL1. It provides five differential outputs with configurable LVPECL, LVDS, or LVCMOS levels. Packaged in a 48-pin WQFN (7.0 x 7.0 x 0.8 mm), it achieves ultra-low RMS jitter performance of 150 fs (12 kHz–20 MHz) and 200 fs (100 Hz–20 MHz).

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Cascaded PLLatinum architecture with dual redundant reference inputs and integrated low-noise crystal oscillator circuit.
• Five dedicated channel divider and delay blocks supporting programmable phase synchronization and output buffering.
• Loss of signal detection with automatic or manual selection of reference clock sources.
• Default startup clock available on CLKout2 to provide initial clock signals for field-programmable gate arrays or microcontrollers.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Data converter clocking
• Wireless infrastructure
• Networking, SONET/SDH, and DSLAM systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the complete part number including suffixes such as NOPB against official Texas Instruments documentation to ensure correct package type and environmental compliance. Confirm that the specific ordering code matches the required pin configuration and thermal specifications for the target application design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when sub-200 femtosecond RMS jitter cleaning is required without external VCXO modules. Ensure the system design accommodates the 1430 MHz to 1570 MHz internal VCO frequency range and utilizes an external crystal with a varactor diode for the integrated oscillator circuit.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the LMK04000 family of precision clock conditioners manufactured by Texas Instruments. It shares the same 48-pin WQFN package and core cascaded PLLatinum architecture with variants like the LMK04000 and LMK04002, differentiated primarily by their internal VCO tuning ranges and output buffer configurations.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMK04000BISQ/NOPB

Clock Generators, PLLs, Frequency Synthesizers FAQ

How does the cascaded PLLatinum architecture improve jitter performance?

PLL1 acts as a low-noise jitter cleaner using a narrow loop bandwidth to clean close-in phase noise, while PLL2 locks the integrated VCO to optimize far-out phase noise cleaning where the VCO outperforms the reference source.

What is the function of the default startup clock?

The default startup clock is available on CLKout2 at power-up, providing an initial clock signal for FPGAs or microcontrollers that program the jitter cleaner during the system initialization sequence.