LMX2337TMX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2337TMX is a monolithic dual frequency synthesizer from the PLLatinum family, manufactured by National Semiconductor. It integrates two independent synthesizers on a single chip, providing output frequencies of 550 MHz and 550 MHz respectively. Designed for RF personal communications, this device utilizes a low-noise charge pump architecture to achieve superior phase noise performance. The component operates within a standard industrial temperature range and is housed in a TSSOP-20 package, offering a compact solution for applications requiring dual-frequency generation with minimal external components.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Monolithic integration of two independent dual frequency synthesizers
• Output configuration: 550 MHz / 550 MHz
• Low-noise charge pump architecture for improved spectral purity
• Single-chip solution reducing board space and component count

Clock Generators, PLLs, Frequency Synthesizers Applications

• RF personal communication systems
• Wireless local loop (WLL) base stations
• Dual-frequency transceiver architectures

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer origin, as National Semiconductor was acquired by Texas Instruments. Confirm the specific suffix 'TMX' indicates tape and reel packaging if required for automated assembly. Ensure compatibility with the 3.3V supply voltage and check for RoHS compliance status relative to the production batch date.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LMX2337TMX when a system requires two synchronized or independent frequency sources within a limited footprint. Compare against the LMX2335 and LMX2336 if different frequency splits (1.1 GHz/1.1 GHz or 2.0 GHz/1.1 GHz) are needed. Verify that the 550 MHz output capability meets the specific channel spacing and bandwidth requirements of the target application.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the National Semiconductor PLLatinum series, which focuses on high-performance frequency synthesis for mobile and wireless infrastructure. The TMX suffix typically denotes a tape-and-reel variant of the LMX2337T, facilitating surface-mount technology (SMT) placement in high-volume manufacturing environments.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include the LMX2335 and LMX2336 for similar dual-synthesizer functionality with different frequency outputs. For single-channel needs, the LMX2323 or LMX2346 may serve as alternatives. Verify pinout compatibility and register settings when migrating between these PLLatinum devices.