LMX2326TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2326TM/NOPB is an obsolete monolithic frequency synthesizer designed for RF personal communications. It operates on a 2.3V to 5.5V supply and features a 32/33 dual modulus prescaler with a maximum input frequency of 2.8 GHz. The device utilizes a digital phase-locked loop technique to generate stable low-noise signals for local oscillators. Key electrical parameters include a typical power supply current of 4.7 mA at 3V, a programmable reference divider (R counter) ranging from 3 to 16383, and a programmable N counter with a maximum value of 262143. It supports MICROWIRE serial interface programming and includes selectable FastLock modes for rapid frequency transitions.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated 32/33 dual modulus prescaler supporting high-frequency RF inputs up to 2.8 GHz
• Programmable R and N counters enabling precise frequency synthesis via MICROWIRE serial interface
• Selectable FastLock modes that dynamically adjust loop bandwidth for fast frequency switching
• Digital lock detect circuitry providing status indication when the VCO frequency is in lock

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems including PCS and PCN
• Wireless local area networks (WLANs)
• Cable TV tuners (CATV)
• Pager devices and other wireless communication systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is classified as obsolete by Texas Instruments. Verify availability through authorized distributors or secondary markets. Confirm the specific revision level and package integrity upon receipt. Ensure handling procedures account for ESD sensitivity due to the CMOS construction. Cross-reference with current replacement families if long-term supply stability is required for production.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this device for applications requiring a low-power PLL synthesizer with a 2.8 GHz input limit. The LMX2326 differs from the LMX2306 and LMX2316 primarily in its prescaler architecture and maximum operating frequency. Ensure the external VCO tuning range matches the charge pump output capabilities. Verify that the system timing requirements align with the MICROWIRE interface specifications and FastLock timeout configurations.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2326 belongs to the PLLatinum family of low-power frequency synthesizers manufactured by Texas Instruments. It shares architectural similarities with the LMX2306 and LMX2316 but is optimized for higher frequency operations up to 2.8 GHz. The device is fabricated using TI's ABiC silicon BiCMOS process. It is housed in a 16-pin TSSOP surface mount plastic package suitable for space-constrained portable designs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the device is marked obsolete, consult Texas Instruments for current generation alternatives within the PLLatinum series or modern frequency synthesizer families.