LMX2352SLBX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2352SLBX is a PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer. It operates with an RF frequency range of 250 MHz to 1.2 GHz and an IF frequency range of 10 MHz to 550 MHz. The device supports supply voltages from 2.7 V to 5.5 V, with typical current consumption of 5.00 mA at 3.0 V. It features a programmable charge pump outputting 100 µA to 1.6 mA for the RF loop and 100 µA or 800 µA for the IF loop. The component utilizes a 24-pin CSP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual synthesizer architecture combining fractional N modulation for the RF path and integer N division for the IF path.
• Integrated dual modulus prescalers supporting selectable ratios of 8/9 or 16/17 for the RF section.
• Programmable MICROWIRE serial interface for configuring counters, charge pump currents, and power states.
• Digital filtered lock detect functionality providing status indication on the multiplexed Fo/LD pin.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems including PCS and PCN
• Dual mode cellular telephone transceivers
• Zero blind slot TDMA communication systems
• Spread spectrum communication systems utilizing CDMA technology

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix SLBX corresponds to the 24-pin CSP plastic package configuration. Confirm that the component meets the required operating temperature range of -40°C to +85°C. Ensure ESD handling protocols are followed during assembly due to the high sensitivity rating of the integrated circuit.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a low-power dual-loop solution is required for UHF and VHF applications. The LMX2352 provides lower RF frequency coverage compared to the LMX2350 variant. Verify that the required RF input frequencies align with the 8/9 or 16/17 prescaler capabilities defined in the electrical characteristics.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the National Semiconductor PLLatinum family of frequency synthesizers, now managed by Texas Instruments following the acquisition. The LMX2352 serves as the lower-frequency counterpart to the LMX2350 within the same product series, sharing identical IF circuitry and control interfaces while differing in maximum RF operating limits.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The LMX2350TM is a functional substitute offering higher RF frequency support up to 2.5 GHz. Both devices share the same package footprint and register programming structure, allowing for direct pin-compatible integration if the system design accommodates the higher frequency range.