LMX1601TMX/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX1601TMX/NOPB is a monolithic dual frequency synthesizer from the PLLatinum family, designed for local oscillator subsystems in radio transceivers. It operates on a single supply voltage ranging from 2.7V to 3.6V with typical current consumption of 4.0 mA at 3V. The device features two independent phase-locked loops (Main and Aux) with selectable gain charge pumps and digital filtered lock detects. It utilizes a MICROWIRE serial interface for programming programmable reference and feedback dividers. The Main PLL supports frequencies up to 1.1 GHz using a 16/17 dual modulus prescaler, while the Aux PLL covers up to 500 MHz or 1.1 GHz depending on configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual independent phase-locked loops with separate VCO control outputs
• MICROWIRE serial interface for programmable divider ratios
• Digital filtered lock detect functionality for both PLL channels
• Hardware-controlled power-down mode reducing current consumption to 1 µA

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cordless phones
• Cellular phones
• PCS phones
• Other digital mobile phones

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. Ensure the part number matches exactly, including the TMX suffix for tape and reel packaging and NOPB for lead-free compliance. Confirm RoHS status and check for potential counterfeit risks given the discontinued status.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing low-cost dual-frequency synthesizers for mobile communication systems requiring a 1.1 GHz main output and a 500 MHz auxiliary output. Consider the 16-TSSOP package constraints and verify that the external VCOs match the specified input sensitivity and frequency ranges. Evaluate the need for dual loop filters and ensure the system architecture supports the MICROWIRE serial programming requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX1601TMX/NOPB belongs to the LMX1600/01/02 family of PLLatinum low-cost dual frequency synthesizers. It shares architectural similarities with the LMX1600 (2.0 GHz/500 MHz) and LMX1602 (1.1 GHz/1.1 GHz). All variants utilize TI's 0.5µm ABiC silicon BiCMOS process and offer comparable power management features and serial interface protocols within the same product line.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

No direct public substitute part numbers are documented for this obsolete component. Designers may consider newer PLLatinum series devices such as the LMX2430 or LMX2541 for updated performance, though pinouts and programming interfaces will differ significantly.