LMX2353SLBX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2353SLBX is a PLLatinum fractional N single frequency synthesizer operating from 0.5 GHz to 2.5 GHz. It features a dual modulus prescaler with selectable 16/17 or 32/33 ratios and modulo 15 or 16 fractional compensation circuitry. The device includes a programmable charge pump with output currents ranging from 100 µA to 1.6 mA in 100 µA steps. Supply voltage ranges from 2.7 V to 5.5 V, with typical current consumption of 5.5 mA at 3.0 V. It utilizes a three-wire MICROWIRE serial interface for configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated fractional N divider with modulo 15 or 16 compensation
• Programmable charge pump current levels from 100 µA to 1.6 mA
• FastLock mode capability for rapid loop bandwidth adjustment
• Digital filtered lock detect output

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications (PCS/PCN, cordless)
• 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 SLBX against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status and moisture sensitivity level prior to procurement. Ensure ESD handling protocols are followed during assembly due to the high-performance RF nature of the component.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LMX2353SLBX when a low-power, single-channel fractional N synthesizer is required for frequencies up to 2.5 GHz. Consider the integrated voltage doubler feature if operating near the lower end of the supply voltage range. Evaluate the FastLock functionality requirements against standard loop filter designs to optimize switching speed.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2353 belongs to the PLLatinum family of frequency synthesizers developed by National Semiconductor, now Texas Instruments. This series focuses on providing flexible, low-noise clock generation solutions for mobile and wireless applications. The LMX2353 specifically targets UHF and VHF bands with integrated fractional-N capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.