LMX2306SLBX/NOPB

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2306SLBX/NOPB is an obsolete monolithic frequency synthesizer from the PLLatinum family, designed for RF personal communications. It operates on a 2.3V to 5.5V supply with ultra-low current consumption of 1.7 mA typical at 3V. The device features a digital phase-locked loop architecture with an 8/9 dual modulus prescaler and supports frequencies up to 550 MHz. Key specifications include a programmable reference divider (R Counter) ranging from 3 to 16383, an N Counter maximum value of 65535, and a charge pump output current of ±250 μA to ±1.0 mA. It utilizes a three-wire MICROWIRE interface for serial data input.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a digital phase-locked loop with an 8/9 dual modulus prescaler for stable low-noise signal generation.
• Supports programmable power-down modes via MICROWIRE interface to minimize current consumption during idle states.
• Features selectable FastLock modes that dynamically adjust loop bandwidth and charge pump magnitude for rapid frequency transitions.
• Includes a digital lock detect circuit with configurable precision thresholds to monitor VCO frequency locking status.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Portable wireless communications systems such as PCS and PCN handsets
• Cordless telephone applications requiring stable local oscillator signals
• Wireless Local Area Networks (WLANs) utilizing frequency synthesis
• Cable TV tuners (CATV) for channel selection and signal processing

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is officially classified as obsolete by Texas Instruments. Verify availability through authorized distributors or secondary market suppliers. Ensure the specific suffix SLBX corresponds to the required package variant. Confirm RoHS compliance details if environmental regulations apply to the end product. No new production units are manufactured.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part only if the application requires a 550 MHz maximum input frequency and 2.3V to 5.5V operation. Compare against newer PLLatinum series devices for improved performance or availability. Ensure the 16-pin TSSOP package fits the PCB layout constraints. Verify that the MICROWIRE interface timing requirements match the host controller capabilities.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2306 belongs to the PLLatinum family of low-power frequency synthesizers. It shares architectural similarities with the LMX2316 and LMX2326 but differs in prescaler configuration and maximum operating frequency. The SLBX suffix typically denotes a specific tape-and-reel packaging option within the TSSOP family. This series was widely used in early-generation mobile communication devices before being superseded by integrated transceivers.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the device is obsolete, engineers should evaluate newer Texas Instruments PLLatinum series components or modern integrated frequency synthesizers that offer compatible pinouts and electrical specifications.

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 when powered between 2.3V and 5.5V.

How does the FastLock feature improve performance?

FastLock enables dynamic adjustment of the PLL loop bandwidth and charge pump current, allowing for faster frequency transitions while maintaining phase noise performance during steady-state operation.

What interface is used to program the internal registers?

The device uses a three-wire MICROWIRE serial interface consisting of Data, Enable, and Clock lines to transfer binary serial data into the 21-bit shift register.