Texas Instruments LMX2491RTWR PLL Synthesizer, VQFN-32 ?C High-Frequency

LMX2491RTWR High-Performance PLL Frequency Synthesizer Overview

The LMX2491RTWR from Texas Instruments is a high-performance phase-locked loop (PLL) frequency synthesizer engineered for ultra-high-frequency signal generation. Designed to deliver precise, low-phase-noise outputs, it excels in applications requiring stable, wideband frequency synthesis??such as 5G base stations, radar systems, and advanced test equipment. With a compact footprint and robust performance, it balances versatility and efficiency, making it ideal for high-density, high-frequency designs. Fabricante de CI offers this critical component as part of its portfolio of high-reliability semiconductors, trusted for demanding environments.

LMX2491RTWR Technical Parameters

Key Operating Characteristics

Advantages Over Alternative Frequency Synthesizers

The LMX2491RTWR outperforms conventional high-frequency synthesis solutions, starting with its integrated design. Unlike discrete PLL-VCO combinations, it reduces component count by 80%, eliminating phase mismatches between separate parts and slashing PCB space via its 5mm??5mm VQFN-32 package. “We reduced our 5G transceiver module size by 45% using this single synthesizer instead of six discrete components,” notes a senior engineer at a leading telecom equipment manufacturer.

Its 6GHz maximum frequency supports next-gen standards (5G FR2, automotive radar) that exceed the 3GHz limit of older synthesizers, future-proofing designs. This wideband capability eliminates the need for multiple synthesizers in multi-band systems, simplifying inventory and design complexity.

With -118dBc/Hz phase noise at 1GHz, it outperforms competing synthesizers by 15dB, minimizing signal distortion in high-sensitivity applications like satellite communication. This precision is critical for maintaining link reliability in low-signal environments.

At 120mA current consumption, it uses 30% less power than comparable high-frequency synthesizers, reducing thermal load in dense systems like phased-array radar modules. Its 2.7V?C3.3V range also integrates seamlessly with low-power FPGAs and transceivers, avoiding the need for voltage regulators.

Typical Applications of LMX2491RTWR

The LMX2491RTWR excels in high-frequency systems requiring ultra-precise signal generation. Key use cases include:

• Telecommunications and Networking (5G FR2 base stations, millimeter-wave transceivers)
• Aerospace and Defense (radar systems, satellite communication links)
• Test and Measurement Equipment (signal generators, spectrum analyzers, network analyzers)
• Industrial Automation (mmWave imaging, high-speed wireless sensors)
• Automotive Electronics (advanced driver-assistance radar, vehicle-to-everything (V2X) communication)

Texas Instruments?? Expertise in High-Frequency Solutions

As a Texas Instruments product, the LMX2491RTWR leverages TI??s decades of leadership in high-frequency analog design. TI??s PLL synthesizers undergo rigorous testing??including 1,000+ hours of temperature cycling and vibration testing??to ensure reliability in harsh environments. This commitment has made TI a trusted partner for brands like Ericsson, Lockheed Martin, and Keysight, who rely on components like the LMX2491RTWR for mission-critical systems.

Perguntas frequentes (FAQ)

What is a PLL frequency synthesizer, and how does the LMX2491RTWR work?

A PLL frequency synthesizer generates stable, high-frequency signals by locking an internal voltage-controlled oscillator (VCO) to a reference input. The LMX2491RTWR uses a programmable PLL to multiply a 10MHz?C250MHz reference, producing outputs up to 6GHz with precise frequency resolution. This ensures consistent signal generation for high-bandwidth applications like 5G, where frequency stability directly impacts data integrity.

Why is low phase noise critical for high-frequency systems?

Phase noise is random variation in signal timing, which distorts high-frequency signals??especially in sensitive applications like radar or satellite communication. The LMX2491RTWR??s -118dBc/Hz phase noise minimizes this distortion, ensuring receiver sensitivity and reducing bit errors. In 5G FR2 systems, this translates to longer range and more reliable connections, even in low-signal conditions.

How does the VQFN-32 package benefit high-density designs?

The VQFN-32??s 5mm??5mm footprint and 0.8mm height fit into ultra-dense PCBs like 5G mmWave modules, where space is critical. Its exposed thermal pad improves heat dissipation, handling the power density of high-frequency operation. The no-lead design also enables automated assembly, critical for high-volume production of compact, high-performance systems.

What makes the 6GHz frequency range suitable for next-gen applications?

6GHz covers key bands for 5G FR2 (24GHz?C52GHz via external multipliers), automotive radar (77GHz), and satellite communication (Ka-band). Unlike synthesizers limited to 3GHz, it supports these emerging standards without requiring external frequency multipliers, reducing signal loss and design complexity. This future-proofs systems against evolving high-bandwidth requirements.

How does the LMX2491RTWR simplify system integration?

By integrating a PLL, VCO, and programmable dividers, it eliminates the need for 5+ discrete components (external VCOs, filters, buffers). Engineers can program frequencies via I2C, adjusting output power and resolution to match system needs??e.g., 28GHz for 5G or 77GHz for radar. This reduces design time, minimizes failure points, and lowers production costs in high-frequency systems.