LMX2350TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2350TM/NOPB is a dual low power frequency synthesizer featuring separate RF and IF phase-locked loops. The LMX2350 variant supports an RF operating range of 500 MHz to 2.5 GHz, while the LMX2352 covers 250 MHz to 1.2 GHz. Both models include a fully programmable IF circuit for frequencies up to 550 MHz. The device utilizes a fractional N technique with modulo 15 or 16 compensation in the RF divider. It operates on a single supply voltage ranging from 2.7 V to 5.5 V. Typical current consumption is 6.75 mA for the LMX2350 and 5.00 mA for the LMX2352 at 3.0 V. The unit is housed in a 24-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual independent PLL architecture supporting simultaneous RF and IF synthesis
• Fractional N capability with modulo 15/16 compensation for reduced spurious levels
• Programmable charge pump currents allowing optimization of loop filter performance
• Integrated digital filtered lock detect function for system status monitoring

Clock Generators, PLLs, Frequency Synthesizers Applications

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

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the ordering suffix 'NOPB' confirms lead-free compliance and matches the specific package style required for your assembly process. Confirm the base part number corresponds to the correct frequency variant (LMX2350 vs LMX2352) as specified in your design documentation before finalizing orders.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LMX2350 if the application requires RF coverage extending up to 2.5 GHz. Choose the LMX2352 for designs where the maximum RF frequency requirement does not exceed 1.2 GHz. Ensure the external VCO input sensitivity aligns with the device's specified input ranges for both RF and IF channels.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the PLLatinum family of frequency synthesizers manufactured by Texas Instruments, formerly National Semiconductor. It is designed to replace discrete synthesizer solutions in compact radio transceiver local oscillator subsystems. The device integrates dual modulus prescalers and fractional compensation circuitry to provide stable low-noise control signals.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct pin-compatible replacements within the same package are limited due to specific prescaler configurations. Verify functional equivalence regarding RF frequency limits and charge pump characteristics when considering alternative dual-PLL synthesizers.