LMX1600TMX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX1600TMX is an obsolete 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 5.0 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 supports a MICROWIRE serial interface for programming reference and feedback dividers. The Main PLL offers a maximum operating frequency of 2.0 GHz, while the Aux PLL supports up to 1.1 GHz or 500 MHz depending on the prescaler configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual independent PLL architecture with separate VCO control outputs
• Configurable dual modulus prescalers for flexible frequency ranges
• Digital filtered lock detect function for both Main and Aux loops
• Hardware-controlled powerdown mode reducing current to 1 µA

Clock Generators, PLLs, Frequency Synthesizers Applications

• Local oscillator subsystems for cordless phones
• Cellular and PCS mobile phone transceivers
• Other digital mobile phone applications

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by Texas Instruments. Verify end-of-life status and last-time-buy dates through authorized distributors before design finalization. Ensure replacement components are qualified for the required operating temperature range and electrical specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part only if legacy compatibility is required. Compare against newer PLLatinum series devices for improved performance. Verify that the 16-pin TSSOP package meets board layout constraints. Confirm that the 2.7V to 3.6V supply range aligns with system power rails.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX1600TMX belongs to the LMX1600/01/02 family of low-cost dual frequency synthesizers. It shares architectural similarities with the LMX1601 and LMX1602 but differs in maximum frequency capabilities. The TMX suffix indicates tape and reel packaging within the 16-pin TSSOP form factor.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX1601TMX

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum operating frequency for the Main PLL?

The Main PLL supports a maximum operating frequency of 2.0 GHz when using the 32/33 dual modulus prescaler option.

How is the device powered down?

Powerdown is hardware-controlled via the ENMAIN and ENAUX pins. Setting these pins LOW disables the respective PLLs and reduces current consumption to approximately 1 µA.

What type of serial interface is used for programming?

The device uses a MICROWIRE serial interface consisting of Data, Clock, and Load Enable (LE) lines to program internal registers.