LMX2353TMX/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2353TMX/NOPB is a PLLatinum fractional N single frequency synthesizer designed for local oscillator subsystems. It operates with an RF input frequency range of 0.5 GHz to 2.5 GHz and supports an oscillator input frequency up to 50 MHz. The device functions on a supply voltage ranging from 2.7 V to 5.5 V, consuming typically 5.5 mA at 3.0 V. It features a programmable charge pump with output currents adjustable from 100 µA to 1.6 mA in 100 µA increments. The component utilizes a 16/17 or 32/33 dual modulus prescaler and includes modulo 15 or 16 fractional compensation circuitry within the N divider.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Fractional N synthesis architecture supporting 1/15 or 1/16 resolution modes
• Programmable charge pump current levels ranging from 100 µA to 1.6 mA
• Integrated digital filtered lock detect functionality
• FastLock mode capability for rapid loop acquisition

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems
• Zero blind slot TDMA systems
• Cellular and cordless telephone systems
• Spread spectrum communication systems (CDMA)
• Cable TV tuners (CATV)

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements as indicated in the datasheet. Confirm that the supply voltage and operating temperature ranges align with the target system design constraints before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a low power, single-channel frequency synthesizer is required for UHF and VHF applications. Consider the available prescaler options based on the desired output frequency range. Evaluate the need for FastLock performance if rapid channel switching is critical. Verify compatibility with the external VCO tuning characteristics and reference oscillator frequencies.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2353 belongs to the PLLatinum family of frequency synthesizers developed by National Semiconductor, now part of Texas Instruments. This series focuses on providing flexible fractional-N synthesis solutions for radio transceiver local oscillators. The TMX/NOPB designation indicates a specific surface-mount packaging variant compliant with environmental standards.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.