LMX3305SLBX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX3305SLBX is a triple Phase Locked Loop (PLL) integrated circuit designed for RF personal communications, specifically CDMA applications. It integrates an RF PLL, an IF Rx PLL, and an IF Tx PLL on a single chip. The device operates with a supply voltage ranging from 2.7V to 3.6V and typically consumes 9 mA of supply current. The RF PLL supports fractional-N synthesis with frequencies from 800 MHz to 1400 MHz in cellular bands and 1200 MHz to 2300 MHz in PCS bands. The IF Rx and Tx PLLs are integer-N synthesizers operating from 45 MHz to 600 MHz. The component is housed in a 24-pin CSP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integration of three distinct PLLs (RF, IF Rx, IF Tx) on a single chip
• Fractional-N capability for the RF PLL with quadruple modulus prescalers
• Fastlock feature allowing increased loop bandwidth during initial lock-on
• Microwire serial interface for programmable register configuration

Clock Generators, PLLs, Frequency Synthesizers Applications

• CDMA Cellular telephone systems
• PCS band frequency synthesis
• Cellular band frequency synthesis

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required package and temperature range. Check lifecycle status as obsolete components may require alternative sourcing strategies or long-lead time procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for designs requiring multiple synchronized frequency synthesizers within a compact footprint. Ensure the application utilizes the specified 2.7V to 3.6V supply range. Verify that the target frequency bands align with the supported cellular and PCS ranges. Consider the 24-pin CSP package constraints during PCB layout.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX3305 belongs to the PLLatinum family of low-power frequency synthesizers originally developed by National Semiconductor, which was later acquired by Texas Instruments. This series targets mobile communication devices requiring efficient power consumption and multi-band support. The SLBX suffix indicates the specific 24-pin CSP packaging variant.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the component is marked obsolete, consult manufacturer resources for qualified replacements or cross-reference compatible triple-PLL synthesizers.