LMX2377UTM

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2377UTM is an obsolete dual-frequency synthesizer from Texas Instruments, designed for RF personal communications. It features integrated dual modulus prescalers and operates within a supply voltage range of 2.7V to 5.5V. The Main synthesizer supports input frequencies from 500 MHz to 2500 MHz with selectable 16/17 or 32/33 prescaler ratios. The Aux synthesizer covers 45 MHz to 1200 MHz using 8/9 or 16/17 prescalers. Both channels include programmable charge pumps with selectable current levels of 0.95 mA or 3.8 mA. The device utilizes a MICROWIRE interface and offers a powerdown mode with typical current consumption of 1 μA.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual synthesizer architecture supporting independent Main and Aux frequency generation
• Ultra-low power consumption with dedicated powerdown mode
• Programmable dual modulus prescalers for flexible divider configurations
• Selectable Fastlock circuitry for the Main synthesizer

Clock Generators, PLLs, Frequency Synthesizers Applications

• Mobile handsets (GSM, GPRS, W-CDMA, CDMA, PCS)
• Cordless handsets (DECT, DCT)
• Wireless data terminals
• Cable TV tuners

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by Texas Instruments. Verify availability through authorized distributors or secondary markets. Confirm manufacturing date codes and storage conditions due to potential shelf-life limitations. Ensure compatibility with existing board layouts before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part for legacy designs requiring dual local oscillators in compact form factors. Evaluate thermal performance given the TSSOP package options. Consider the MICROWIRE interface requirements for baseband controllers. Review absolute maximum ratings to ensure system voltages remain within safe operating limits.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2377U belongs to the PLLatinum family of low-power synthesizers. It serves as an upgrade and compatible replacement for the LMX2370 series. The device integrates both analog and digital circuits necessary for generating stable control signals for VCOs in dual-conversion radio transceivers.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Texas Instruments application notes for modern equivalents suitable for current production cycles.