LMX2433TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2433TM/NOPB is a dual high-frequency synthesizer from the PLLatinum family, designed for RF personal communications. It integrates two independent phase-locked loops: an RF synthesizer operating up to 3.6 GHz and an IF synthesizer operating up to 1.7 GHz. The device supports a supply voltage range of 2.25 V to 2.75 V with typical current consumption of 3.2 mA for the RF section and 2 mA for the IF section. It features programmable charge-pump currents of 1 mA or 4 mA, Fastlock circuitry with integrated time-out counters, and a 1.8-V MICROWIRE serial interface.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual synthesizer architecture providing independent RF and IF frequency generation capabilities within a single package.
• Fastlock technology with integrated time-out counters enables rapid frequency switching requiring only a single word write operation.
• Programmable two-level charge pump allows selection between 1 mA and 4 mA output currents to optimize loop filter design.
• Digital filtered lock-detect output provides a reliable indication of phase lock status without external components.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Mobile handsets
• Cordless handsets
• Wireless data terminals

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'TM' against the manufacturer's orderable addendum to confirm the TSSOP-20 package variant. Ensure the component meets RoHS compliance standards as indicated by the NOPB designation. Cross-reference the datasheet revision history to confirm the document version matches the manufacturing batch specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when applications require simultaneous RF and IF synthesis in the sub-4 GHz range. The LMX2433 offers higher maximum frequencies compared to the LMX2430 but consumes more power. Verify that the required input sensitivity and phase noise performance align with the system requirements at the target operating frequencies.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LMX243x series, which includes the LMX2430 and LMX2434 variants. These devices share a common functional block diagram and interface protocol but differ in their maximum operating frequencies and power consumption profiles. The TM suffix specifically denotes the Thin Shrink Small Outline (TSSOP) package configuration.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2430TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum operating frequency for the RF synthesizer in the LMX2433?

The RF synthesizer operates up to 3.6 GHz.

How does the Fastlock feature improve performance?

It reduces settling time during frequency changes by using integrated time-out counters, allowing the PLL to lock with a single register write.

What logic levels are supported by the serial interface?

The device supports a 1.8-V MICROWIRE logic interface, allowing direct connection to low-voltage digital controllers.