LMX2491RTWT

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2491RTWT is a broadband delta-sigma fractional-N phase-locked loop (PLL) frequency synthesizer manufactured by Texas Instruments. It operates with an output frequency range up to 6.4 GHz and supports input frequencies from 500 MHz to 6.4 GHz. The device utilizes a 24-WFQFN exposed pad package and functions within a supply voltage range of 3.15 V to 3.45 V. It features a single circuit configuration with a 2:1 input-to-output ratio. The component is rated for operation across a temperature range of -40°C to 125°C and includes integrated dividers and multipliers.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a broadband delta-sigma fractional-N PLL architecture designed for low phase noise performance.
• Supports programmable ramp generation capabilities for linear frequency modulation applications.
• Provides high-speed frequency synthesis suitable for radar and communication systems.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Frequency modulated continuous wave (FMCW) radar systems
• Microwave point-to-point communication links
• Satellite communication equipment including VSAT

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix RTWT against official datasheets to confirm the tape and reel packaging format. Ensure compatibility with standard surface mount assembly processes. Confirm that the 24-WFQFN exposed pad thermal requirements are met in the final design. Validate moisture sensitivity level handling procedures during storage and reflow soldering.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a single-channel RF frequency synthesizer with outputs up to 6.4 GHz is required. Consider the LMX2492 series if higher frequency coverage beyond 6.4 GHz is necessary. Evaluate the power supply constraints, as the device requires a stable 3.15 V to 3.45 V source. Verify that the 24-pin WQFN package fits the available PCB real estate.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the LMX249x family of wideband PLL frequency synthesizers from Texas Instruments. These devices are engineered for high-performance RF applications requiring precise frequency control. The LMX2491 variant specifically targets systems needing lower maximum frequencies compared to the LMX2492, offering a cost-effective solution for sub-6.4 GHz designs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2492RTWT offers extended frequency coverage up to 14 GHz. LMX2485 provides dual PLL functionality at lower frequency ranges. Verify pinout and register compatibility before substituting these alternatives.