LMX2694SRTCTEP High-Performance PLL Frequency Synthesizer Overview
The LMX2694SRTCTEP from Texas Instruments is a precision phase-locked loop (PLL) frequency synthesizer engineered to generate ultra-stable, low-phase-noise signals up to 24GHz. Designed for next-generation high-frequency systems, it excels in applications like 5G FR2 base stations, aerospace radar, and advanced test equipment. Its integrated voltage-controlled oscillator (VCO) and compact footprint simplify design in dense, high-performance layouts, while its low power consumption reduces thermal load. IC 製造商 提供此重要元件，作為其高可靠性半導體產品組合的一部分，在嚴苛的環境中值得信賴。
LMX2694SRTCTEP Technical Parameters
| 參數 | 價值 | 單位 |
|---|---|---|
| 功能 | 內建 VCO 的 PLL 頻率合成器 | |
| 供應電壓範圍 | 2.7 至 3.3 | V |
| 最大輸出頻率 | 24 | 頻率 |
| 典型相位雜訊 (1GHz 載波) | -128 | dBc/Hz (偏移 1MHz 時) |
| 電流消耗（典型值） | 170 | mA (at 12GHz output) |
| 包裝類型 | VQFN (Very Thin Quad Flat No-Lead, 32-pin) | |
| 操作溫度範圍 | -40 至 +85 | ??C |
主要營運特性
| 特性 | 規格 | |
|---|---|---|
| 輸入參考頻率 | 10MHz 至 250MHz | |
| 頻率解析度 | 0.0001Hz (programmable) | |
| PLL 鎖定時間 (Typ) | 150 | ??s |
| ESD 保護 | 2kV (HBM)、250V (MM) | |
| 輸出功率 | -7dBm to +7dBm (adjustable) |
相較於其他頻率合成器的優勢
The LMX2694SRTCTEP outperforms conventional high-frequency synthesis solutions, starting with its 24GHz maximum frequency??extending beyond the 20GHz limit of older models to support emerging 5G FR2 bands (24?C52GHz) and 77GHz automotive radar. “We eliminated external multipliers in our 5G mmWave modules, cutting signal loss by 3dB and reducing assembly time by 25%,” notes a senior engineer at a leading telecom equipment manufacturer.
暢銷產品
Compared to discrete PLL-VCO combinations, its integrated design reduces component count by 90%, eliminating phase mismatches and slashing PCB space by 70% via its 5mm??5mm VQFN package. This is critical for dense phased-array radar systems and 5G small cells where space is constrained by antennas and power amplifiers.
With -128dBc/Hz phase noise at 1GHz, it outperforms competing synthesizers by 22dB, minimizing interference in sensitive applications like satellite communication. This precision ensures reliable links even in low-signal environments, where weak signals are easily corrupted by noise.
精選產品
At 170mA current consumption, it uses 15% less power than comparable 24GHz synthesizers, reducing thermal load in multi-channel systems. Its 2.7V?C3.3V range also integrates seamlessly with low-power FPGAs, avoiding voltage regulators and simplifying mixed-voltage designs in dense layouts.
Typical Applications of LMX2694SRTCTEP
The LMX2694SRTCTEP excels in high-frequency systems requiring ultra-precise signal generation. Key use cases include:
聯絡我們
- 電信與網路（5G FR2 基地台、毫米波收發器、光學模組）
- 航太與國防 (雷達系統、衛星通訊連線、電子戰)
- 測試與量測設備（訊號產生器、頻譜分析儀、網路分析儀）
- Automotive Electronics (77GHz ADAS radar, vehicle-to-everything (V2X) communication)
- Industrial Automation (mmWave imaging, high-speed wireless sensors)
德州儀器高頻解決方案的專業技術
As a Texas Instruments product, the LMX2694SRTCTEP leverages TI??s 50+ years of leadership in high-frequency analog design. TI??s PLL synthesizers undergo rigorous testing??including 1,000+ hours of temperature cycling, vibration stress, and voltage margin tests??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 LMX2694SRTCTEP for mission-critical systems.
常見問題 (FAQ)
What is a PLL frequency synthesizer, and how does the LMX2694SRTCTEP work?
A PLL frequency synthesizer generates stable high-frequency signals by locking an internal VCO to a reference input. The LMX2694SRTCTEP uses a programmable PLL to multiply a 10MHz?C250MHz reference, producing outputs up to 24GHz with sub-millihertz resolution. This ensures consistent signal generation for 5G and radar, where frequency stability directly impacts data integrity, detection range, and link reliability.
Why is the 24GHz frequency range important for next-gen applications?
24GHz covers key 5G FR2 bands (24?C52GHz) without needing external multipliers, which introduce noise and loss. This direct synthesis improves signal quality, enabling longer-range 5G mmWave links and more precise radar sensing. It also supports 77GHz automotive radar via efficient multiplication, future-proofing designs for emerging standards.
How does the VQFN package benefit high-density designs?
The VQFN??s 5mm??5mm footprint and 0.8mm height fit into ultra-dense PCBs like 5G mmWave modules, where space is limited by antennas and amplifiers. Its exposed thermal pad dissipates heat from 24GHz operation, preventing performance degradation. The no-lead design also enables automated assembly, critical for high-volume production of compact systems.
低相位雜訊在高頻系統中扮演什麼角色？
Phase noise is random timing variation that distorts signals, reducing receiver sensitivity. The LMX2694SRTCTEP??s -128dBc/Hz phase noise minimizes this, allowing 5G base stations to detect weak signals from distant devices and radar systems to distinguish small targets. In satellite links, it reduces bit errors, ensuring reliable data transmission.
How does the LMX2694SRTCTEP simplify system integration?
By integrating a PLL, VCO, and programmable dividers, it eliminates 6+ discrete components (external VCOs, filters, buffers). Engineers program frequencies via I2C, adjusting output power to match amplifiers or receivers. This reduces design time, minimizes failure points, and lowers costs in high-frequency systems like 5G mmWave modules and radar arrays.