LMX2571NJKT

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2571NJKT is a low-power, high-performance PLLatinum RF synthesizer manufactured by Texas Instruments. It integrates a tri-band fractional-N PLL, multi-core VCOs, programmable output dividers, and two output buffers. The internal VCO core operates at frequencies up to 5.376 GHz, generating continuous outputs in the range of 10 MHz to 1.4 GHz. The device supports external VCO configurations via dedicated charge pumps and dividers. Key electrical parameters include a maximum input frequency of 30 MHz, an operating supply voltage of 3.15 V to 3.45 V, and a functional temperature range from -40°C to +85°C. It is housed in a 36-WFQFN exposed pad package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a unique programmable multiplier designed to improve spurious performance and enable channel usage even at integer boundaries.
• Features integrated SPDT switches on the outputs to function as transmit/receive switches in FDD radio applications.
• Supports direct digital FSK modulation for efficient signal generation without external modulators.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Frequency Division Duplex (FDD) wireless radios requiring integrated transmit/receive switching.
• Low-power cellular infrastructure base stations.
• Point-to-point microwave communication systems.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix NJKT against official Texas Instruments documentation to confirm the reel quantity and tape-and-reel specifications. Ensure that the ordering information matches the exact package type and moisture sensitivity level required for your assembly process. Cross-reference the manufacturer part number with authorized distributors to confirm current product status and availability constraints.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a wide tuning range up to 1.4 GHz is required alongside low power consumption. The integrated SPDT switch capability makes it suitable for compact designs where external switching components would otherwise increase board space. Consider the internal VCO bandwidth and phase noise characteristics relative to the specific application's spectral mask requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the LMX2571 family of PLLatinum synthesizers. It shares architectural similarities with other devices in the series but is distinguished by its specific packaging and factory configuration. The device represents a solution for integrating complex frequency synthesis functions into a single small-footprint IC.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2571NJKR

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the LMX2571 operate with an external VCO?

Yes, the device can be configured to work with an external VCO using dedicated 5 V charge pumps and output dividers provided within the chip.

What is the maximum frequency generated by the internal VCO core?

The internal VCO core operates at frequencies up to 5.376 GHz, although the final output is divided down to a maximum of 1.4 GHz.

How does the programmable multiplier benefit system design?

The programmable multiplier improves spurious performance, allowing the system to utilize every channel effectively, even when operating near integer boundaries.