LMX1511TMX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX1511TMX is a high-performance frequency synthesizer designed for RF operation up to 1.1 GHz, fabricated using ABiC IV BiCMOS process technology. It features a dual modulus prescaler with selectable divide ratios of 64/65 or 128/129 and utilizes a proprietary digital phase-locked loop technique for stable local oscillator generation. The device operates on a supply voltage ranging from 2.7V to 5.5V with typical current consumption of 6 mA at 3V. Configuration is managed via a three-line MICROWIRE interface. It is housed in a 20-pin TSSOP surface-mount package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual modulus prescaler supporting 64/65 or 128/129 divide ratios
• Internal balanced charge pump with low leakage characteristics
• Three-line MICROWIRE serial data interface for configuration
• Analog switch output (BISW) for rapid frequency scanning

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular telephone systems including AMPS, NMT, and ETACS
• Portable wireless communications such as PCS/PCN and cordless devices
• Advanced cordless telephone systems like CT-1, CT-1a, CT-2, and ISM902-928

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized distributors due to obsolete status. Confirm package integrity and pin alignment against the 20-TSSOP specification. Review datasheet revisions for any historical updates regarding electrical characteristics or handling precautions before integration into production designs.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for applications requiring RF synthesis up to 1.1 GHz with low power consumption. Ensure the design accommodates the 2.7V to 5.5V supply range and utilizes the internal charge pump or external circuitry based on specific noise and spur requirements. Verify compatibility with the required serial control interface timing.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the PLLatinum family of frequency synthesizers developed by National Semiconductor, now under Texas Instruments. It shares architectural similarities with the LMX1501A but differs in packaging, utilizing a 20-pin TSSOP instead of a 16-pin JEDEC outline. Both variants target personal communication systems requiring compact form factors.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.