LMX2336TMX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2336TMX is a monolithic dual frequency synthesizer designed for RF personal communications. It operates on a 2.7V to 5.5V supply with typical current consumption of 13 mA at 3V. The device features two independent RF phase-lock loops, where the first loop supports an input frequency up to 2.0 GHz and the second up to 1.1 GHz. Both loops utilize selectable dual modulus prescalers (64/65 or 128/129). It includes a programmable reference divider chain, selectable charge pump current levels, and a FastLock mode. The component is housed in a TSSOP-20 surface mount package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual high-frequency prescalers enable independent operation of two RF phase-lock loops
• Programmable reference dividers and N-counters provide flexible frequency synthesis
• Selectable FastLock mode accelerates lock acquisition time
• Configurable charge pump TRI-STATE mode reduces power consumption

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular telephone systems (AMPS, ETACS, RCR-27)
• Cordless telephone systems (DECT, ISM, PHS, CT-1+)
• Personal Communication Systems (DCS-1800, PCN-1900)
• Dual Mode PCS phones
• CATV applications

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the ordering suffix TMX corresponds to the Tape and Reel packaging format containing 2500 units per reel. Confirm the specific part number matches the Texas Instruments or National Semiconductor datasheet SNAS100 specifications. Ensure compatibility with the required TSSOP-20 footprint during procurement planning.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a dual-loop synthesizer is required with one loop supporting frequencies up to 2.0 GHz. Verify that the system design accommodates the 2.7V to 5.5V operating voltage range. Consider the TSSOP-20 package dimensions for PCB layout constraints and ensure ESD protection protocols are followed during handling.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LMX2335/LMX2336/LMX2337 PLLatinum family of dual frequency synthesizers. While functionally similar to the LMX2335 and LMX2337, the LMX2336 is distinct due to its higher maximum input frequency capability on the first RF loop. It utilizes the ABiC IV silicon BiCMOS process for integration.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2335TMX and LMX2337TMX are related family members but differ in maximum input frequency specifications. Direct substitution requires verifying that the target application does not require the 2.0 GHz input capability unique to the LMX2336.