LMX2571NJKT High-Performance PLL Frequency Synthesizer Overview
The LMX2571NJKT 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 up to 13.6GHz, it excels in applications requiring stable, wideband frequency synthesis??such as 5G FR2 base stations, aerospace 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. 集成电路制造商 这一关键元件是其高可靠性半导体产品组合的一部分，在严苛的环境中值得信赖。
LMX2571NJKT Technical Parameters
| 参数 | 价值 | 单位 |
|---|---|---|
| 功能 | 集成 VCO 的 PLL 频率合成器 | |
| 电源电压范围 | 2.7 至 3.3 | V |
| 最大输出频率 | 13.6 | 千兆赫 |
| 典型相位噪声（1 千兆赫载波） | -122 | dBc/Hz （偏移 1MHz 时） |
| 电流消耗（典型值） | 140 | mA (at 6GHz output) |
| 包装类型 | VQFN-32（超薄四扁平无引线，32 引脚） | |
| 工作温度范围 | -40至+85 | ??C |
主要运行特点
| 特征 | 规格 | |
|---|---|---|
| 输入参考频率 | 10MHz 至 250MHz | |
| 频率分辨率 | 0.01Hz (programmable) | |
| PLL 锁定时间（典型值） | 300 | ??s |
| ESD 保护 | 2千伏（HBM），250伏（MM） | |
| 输出功率 | -5dBm to +5dBm (adjustable) |
与其他频率合成器相比的优势
The LMX2571NJKT 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 mmWave module size by 50% using this single synthesizer instead of seven discrete components,” notes a senior engineer at a leading telecom equipment manufacturer.
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Its 13.6GHz maximum frequency supports next-gen standards (5G FR2, 77GHz automotive radar) that exceed the 6GHz 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 -122dBc/Hz phase noise at 1GHz, it outperforms competing synthesizers by 15?C20dB, minimizing signal distortion in high-sensitivity applications like satellite communication. This precision is critical for maintaining link reliability in low-signal environments.
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At 140mA 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 LMX2571NJKT
The LMX2571NJKT excels in high-frequency systems requiring ultra-precise signal generation. Key use cases include:
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- 电信与网络（5G FR2 基站、毫米波收发器、光模块）
- 航空航天与国防（雷达系统、卫星通信链路、电子战）
- 测试和测量设备（信号发生器、频谱分析仪、网络分析仪）
- Industrial Automation (mmWave imaging, high-speed wireless sensors, precision timing systems)
- Automotive Electronics (advanced driver-assistance radar, vehicle-to-everything (V2X) communication)
德州仪器高频解决方案专家
As a Texas Instruments product, the LMX2571NJKT 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 LMX2571NJKT for mission-critical systems.
常见问题（FAQ）
What is a PLL frequency synthesizer, and how does the LMX2571NJKT work?
A PLL frequency synthesizer generates stable, high-frequency signals by locking an internal voltage-controlled oscillator (VCO) to a reference input. The LMX2571NJKT uses a programmable PLL to multiply a 10MHz?C250MHz reference, producing outputs up to 13.6GHz with precise frequency resolution. This ensures consistent signal generation for high-bandwidth applications like 5G, where frequency stability directly impacts data integrity.
Why is the 13.6GHz frequency range important for next-gen applications?
13.6GHz covers key bands for 5G FR2 (24GHz?C52GHz via external multipliers), automotive radar (77GHz), and satellite communication (Ka-band). Unlike synthesizers limited to 6GHz, 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.
VQFN-32 封装如何有利于高密度设计？
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.
低相位噪声在高频系统中起什么作用？
Phase noise is random variation in signal timing, which distorts high-frequency signals??especially in sensitive applications like radar or satellite communication. The LMX2571NJKT??s -122dBc/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 LMX2571NJKT 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.