LMX2335USLBX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2335USLBX is a monolithic, integrated dual frequency synthesizer from the PLLatinum family, originally developed by National Semiconductor and now under Texas Instruments. Designed for RF personal communications, it integrates two high-frequency prescalers to support applications requiring two independent RF phase-lock loops. The device utilizes a silicon BiCMOS process and features selectable dual modulus prescalers (64/65 or 128/129) for each synthesizer channel. It includes a second reference divider chain to improve system noise performance and operates within a voltage range of 2.7V to 5.5V.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual frequency synthesizer architecture with two integrated high-frequency prescalers
• Ultra-low current consumption with selectable synchronous and asynchronous powerdown modes
• Selectable charge pump TRI-STATE mode and adjustable charge pump current levels
• Compatible with Fastlock mode for rapid settling times

Clock Generators, PLLs, Frequency Synthesizers Applications

• RF personal communication systems requiring dual phase-lock loops
• Voice and data transceiver local oscillators
• Wireless infrastructure components needing low-power frequency synthesis

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer status as National Semiconductor was acquired by Texas Instruments; ensure datasheets reflect TI documentation standards. Confirm the specific suffix USLBX corresponds to the TSSOP surface-mount package variant. Check for obsolescence notices or lifecycle status changes post-acquisition. Validate that the component meets required RoHS compliance if applicable to the target market.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when dual independent VCO control is necessary within a single package footprint. Ensure the application requires the specific dual modulus prescaler options (64/65 or 128/129). Verify that the operating voltage range of 2.7V to 5.5V aligns with the system power supply. Consider the TSSOP package constraints for PCB layout and thermal management.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2335 series belongs to the PLLatinum family of low-power frequency synthesizers. The LMX2335USLBX is a specific package variant of the LMX2335L/LMX2336L series, designed for upgrade compatibility with earlier LMX2335/36 models. It shares architectural similarities with other PLLatinum devices like the LMX2306 and LMX2323 but offers dual-synthesizer functionality.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct pin-to-pin replacements may include the LMX2335L or LMX2336L depending on prescaler configuration needs. Verify functional equivalence with LMX2335M or LMX2335LM variants. Cross-reference with LMX2330A for single-synthesizer alternatives if dual channels are not required.