LMX2485QSQ/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2485QSQ/NOPB is an automotive-grade fractional-N delta-sigma phase-locked loop (PLL) frequency synthesizer manufactured by Texas Instruments. It operates within a supply voltage range of 2.5 V to 3.6 V and draws a typical operating current of 3.3 mA. The device supports an output frequency range from 500 MHz to 3.1 GHz. It is qualified under the AEC-Q100 standard for automotive applications and functions reliably across a temperature range of -40°C to +105°C. The component is housed in a WQFN-24 surface-mount package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliability in vehicle environments
• Delta-sigma modulation architecture designed to minimize spurious emissions
• Integrated low-noise voltage-controlled oscillator (VCO) for direct frequency synthesis

Clock Generators, PLLs, Frequency Synthesizers Applications

• Automotive radar systems requiring precise frequency generation
• Telematics units in connected vehicles
• Advanced driver-assistance systems (ADAS) RF front-ends

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'SQ' confirms the automotive grade and 'NOPB' indicates lead-free/RoHS compliance when sourcing. Confirm the manufacturer datasheet revision matches the design requirements. Ensure the WQFN-24 footprint aligns with the PCB layout specifications. Check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for designs requiring a single-chip PLL solution with integrated VCO for automotive frequencies between 500 MHz and 3.1 GHz. Compare against the LMX2486 series if higher output frequencies up to 4.5 GHz are needed, noting the LMX2486 has a lower maximum operating temperature of +85°C. Ensure the system power budget accommodates the 3.3 mA typical current draw at 2.5 V to 3.6 V operation.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the LMX2485Q family of automotive PLLs. It shares the core architecture with non-automotive variants but includes extended temperature rating and qualification testing. It is distinct from the LMX2486, which targets higher frequency ranges but lacks the full automotive temperature range certification.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2486SQ/NOPB offers similar functionality but covers 1 GHz to 4.5 GHz with a limited temperature range of -40°C to +85°C.