LMX2306TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2306TM/NOPB is an obsolete monolithic frequency synthesizer from Texas Instruments designed for RF personal communications. It operates on a 2.3V to 5.5V supply with ultra-low current consumption of 1.7 mA at 3V. The device features a digital phase-locked loop, a programmable reference divider (R counter), and an N counter utilizing an 8/9 dual modulus prescaler. It supports MICROWIRE serial interface programming, selectable charge pump tri-state modes, and FastLock functionality for rapid frequency transitions. The component is housed in a 16-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Ultra-low power consumption suitable for battery-operated portable devices
• Integrated digital phase-locked loop with programmable R and N counters
• FastLock mode capability for dynamic bandwidth adjustment during frequency switching
• Programmable power-down modes including synchronous and asynchronous options

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems such as PCS and PCN
• Cordless telephones and other wireless communication equipment
• Wireless Local Area Networks (WLANs)
• Cable TV tuners (CATV)

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by the manufacturer. Verify availability through secondary market distributors or surplus suppliers. Ensure that any sourced units are genuine and have not exceeded storage limits. Check for potential pin compatibility issues if replacing with newer generation synthesizers in existing designs.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part only for legacy system maintenance or specific low-frequency applications where its 550 MHz maximum input frequency is sufficient. Compare against modern alternatives like the LMX2430 series for higher performance requirements. Consider the impact of obsolescence on long-term production sustainability when designing new hardware.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2306 belongs to the PLLatinum family of low-power frequency synthesizers developed by Texas Instruments. It shares architectural similarities with the LMX2316 and LMX2326 models, differing primarily in their supported RF input frequency ranges. This specific variant targets lower frequency bands compared to its siblings.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2316TM/NOPB

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum RF input frequency for the LMX2306?

The maximum RF input operating frequency for the LMX2306 is 550 MHz.

How does the FastLock feature improve performance?

FastLock allows the designer to achieve fast frequency transitions while maintaining good phase noise by dynamically changing the PLL loop bandwidth and charge pump current magnitude.

What interface is used to program the device registers?

Serial data is transferred into the LMX2306 via a three-wire MICROWIRE interface consisting of Data, Enable, and Clock lines.