LMX2354SLBX/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2354SLBX/NOPB is an obsolete PLLatinum Fractional N/Integer N dual low power frequency synthesizer from Texas Instruments. It operates within a 2.7V to 5.5V supply range and consumes typically 7 mA at 3V in RF mode, or 5 µA in logical power down. The device features a quadruple modulus prescaler supporting ratios of 16/17/20/21 for frequencies between 1.2 GHz and 2.5 GHz, and 8/9/12/13 for 550 MHz to 1.2 GHz. It includes programmable charge pump currents ranging from 100 µA to 1.6 mA, digital filtered lock detect, and a Microwire serial interface.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual independent phase-locked loops with fractional compensation circuitry
• Quadruple modulus prescaler for flexible frequency division ranges
• Programmable charge pump current levels via serial interface
• Digital filtered lock detect function for system status monitoring

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems
• Dual mode cellular telephone systems
• Zero blind slot TDMA systems
• Spread spectrum communication systems
• Cable TV tuners

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by the manufacturer. Verify availability through authorized distributors or secondary markets. Confirm that the specific package variant matches your board layout requirements. Ensure compliance with end-of-life transition policies before finalizing design integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part only if legacy compatibility with the LMX2350 family is required. Evaluate the available prescaler options against your target frequency bands. Consider the power consumption specifications relative to battery-operated constraints. Review the serial programming interface requirements for system control logic.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2354 belongs to the PLLatinum family of frequency synthesizers designed for local oscillator subsystems. It serves as a functional equivalent to earlier models while offering enhanced low noise performance. The device utilizes TI's BiCMOS process technology to achieve high-frequency operation with low power dissipation.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The datasheet identifies the LMX2350 as a pin-compatible and functional equivalent. Designers replacing older components should account for differences in prescaler bit configurations and fractional engine capabilities when migrating designs.