LMX2324TMX/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2324 is an obsolete PLLatinum frequency synthesizer designed for RF personal communications. It operates up to 2.0 GHz with a 32/33 dual modulus prescaler and supports supply voltages from 2.7V to 5.5V. Typical current consumption is 3.5 mA at 3.0V, with a power-down current of 10 µA. The device features a 4.0 mA balanced charge pump and accepts reference oscillator inputs up to 40 MHz via the OSCin pin. It utilizes a three-line MICROWIRE serial interface for programming. The N counter provides integer divide ratios from 992 to 32,767, while the R counter divides by 2 to 1,023. Operating temperatures range from -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated 32/33 dual modulus prescaler enables direct RF operation up to 2.0 GHz.
• Proprietary digital phase-locked loop technique ensures stable, low-noise control signals.
• Internal balanced charge pump delivers 4.0 mA output current with minimal leakage.
• Three-line MICROWIRE serial interface allows efficient configuration of counters and registers.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular telephone systems including GSM, NADC, CDMA, and PDC
• Personal wireless communications such as DCS-1800, DECT, and CT-1+
• Wireless local area networks (WLANs)
• Other general-purpose wireless communication systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by Texas Instruments. Verify availability through authorized distributors or secondary markets. Confirm that the specific package variant matches the design requirements, as legacy stock may vary in condition. Ensure compliance with end-of-life management policies before finalizing procurement plans.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component only if the application specifically requires the LMX2324 architecture or existing board compatibility. Evaluate the 2.0 GHz upper frequency limit and 3.5 mA typical current draw against system constraints. Consider the obsolete status when planning long-term production lifecycles and potential redesign efforts.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2324 belongs to the PLLatinum family of frequency synthesizers developed using TI's ABiC V BiCMOS process. It was engineered primarily for mobile and personal communication devices requiring high-performance frequency synthesis within a compact footprint. The device integrates essential PLL components, reducing external part counts.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, alternative solutions require manual evaluation of functional equivalents based on specific RF performance criteria.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum operating frequency of the LMX2324?

The LMX2324 supports RF operation up to 2.0 GHz utilizing its integrated 32/33 dual modulus prescaler.

How is the device powered down?

Power down can be achieved asynchronously by setting the CE pin LOW or synchronously via the MICROWIRE interface by programming the PWDN bit in the N register.

What is the input sensitivity for the RF prescaler?

The input sensitivity is specified as -15 dBm at VCC = 3.0V and -10 dBm at VCC = 5.0V.