LMX2336USLBX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2336USLBX is a monolithic, integrated dual frequency synthesizer from the PLLatinum™ family, designed for RF personal communications. Fabricated using National Semiconductor’s 0.5µ ABiC V silicon BiCMOS process, it integrates two high-frequency prescalers to support applications requiring two RF phase-lock loops. The device operates within a voltage range of 2.7V to 5.5V and features ultra-low current consumption. It includes selectable synchronous and asynchronous powerdown modes with typical supply current of 1 µA. The LMX2336L variant specifically supports a 2.0 GHz/1.1 GHz frequency configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual modulus prescaler options: 64/65 or 128/129 for each RF synthesizer
• Selectable charge pump TRI-STATE mode and adjustable charge pump current levels
• Integrated second reference divider chain for improved system noise performance
• Small-outline, plastic, surface mount TSSOP package

Clock Generators, PLLs, Frequency Synthesizers Applications

• RF personal communications systems
• Applications requiring dual RF phase-lock loops
• Low power wireless communication devices

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'USLBX' against official Texas Instruments or National Semiconductor documentation to confirm pinout, temperature grade, and tape-and-reel specifications. As National Semiconductor was acquired by TI, ensure the datasheet version corresponds to the correct manufacturer lineage. Confirm availability status as this component may be legacy.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LMX2336USLBX when a dual synthesizer solution is required with one loop operating up to 2.0 GHz and the other up to 1.1 GHz. Compare against the LMX2335L if both loops require 1.1 GHz operation. Ensure the design accommodates the TSSOP package dimensions and that the 2.7V to 5.5V supply range aligns with the system power architecture.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2336USLBX belongs to the LMX233xL series of low-power dual frequency synthesizers. It is an upgrade and compatible successor to the non-L LMX2335/36 models. The 'L' designation indicates the low-power variant fabricated on the 0.5µ ABiC V process, offering reduced current consumption compared to earlier generations while maintaining similar functional interfaces.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The LMX2335L is a direct functional alternative if both synthesizer loops are required to operate at 1.1 GHz rather than the 2.0 GHz/1.1 GHz split of the LMX2336L. Verify package compatibility between TSSOP variants before substitution.