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Product Overview
The LMK04821NKDT from Texas Instruments is a high-performance clock jitter cleaner and generator with dual PLLs and 14 differential outputs. It is designed to provide ultra-low jitter clock synthesis and cleaning for demanding applications such as wireless infrastructure, data converters, and networking. The device integrates two independent PLLs with VCOs, supporting frequencies up to 3.1 GHz, and offers flexible output configurations with programmable output formats (LVDS, LVPECL, HCSL, etc.). The 64-pin WQFN package (9x9 mm) enables compact board design.
Detailed Technical Specifications
| Parameter |
Value |
| PLL Count |
2 |
| VCO Frequency Range |
2.5 to 3.1 GHz |
| Output Frequency Range |
Up to 3.1 GHz |
| Number of Outputs |
14 differential |
| RMS Jitter (12 kHz to 20 MHz) |
≤ 100 fs |
| Phase Noise at 100 kHz offset (2457.6 MHz) |
-152 dBc/Hz |
| Supply Voltage |
3.3 V / 1.8 V |
| Package |
64-WQFN (9x9 mm) |
| Operating Temperature |
-40°C to +85°C |
Key Features
- Ultra-low jitter: <100 fs RMS (12 kHz–20 MHz)
- Dual PLL architecture with integrated VCOs
- 14 differential outputs with programmable formats
- Supports jitter cleaning and frequency synthesis
- SPI interface for configuration
- Holdover mode for holdover applications
- Low power consumption: 1.2 W typical
Target Applications
- 5G base stations (e.g., Massive MIMO, gNodeB)
- Wireless infrastructure (e.g., small cells, remote radio heads)
- Data converters (e.g., ADC/DAC clocking for radar, test equipment)
- Networking (e.g., switches, routers, 100G Ethernet)
- Medical imaging (e.g., ultrasound, CT scanners)
- Industrial automation (e.g., high-speed data acquisition)
Global Supply Chain & Wholesale Solutions
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LMK04821NKDT. Our core advantages include:
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and seals to ensure ESD protection and physical integrity.
產品概述
LMK04821NKDT 是德州儀器(TI)推出的一款高性能時鐘抖動清除與生成器,具有雙 PLL 和 14 個差分輸出。它專為無線基礎設施、數據轉換器和網絡等要求嚴苛的應用而設計,可提供超低抖動時鐘合成與淨化。該器件集成了兩個獨立的 PLL 和 VCO,支持高達 3.1 GHz 的頻率,並提供靈活的輸出配置,支持可編程輸出格式(LVDS、LVPECL、HCSL 等)。64 引腳 WQFN 封裝(9x9 mm)有助於實現緊湊的電路板設計。
詳細技術參數
| 參數 |
數值 |
| PLL 數量 |
2 |
| VCO 頻率範圍 |
2.5 至 3.1 GHz |
| 輸出頻率範圍 |
最高 3.1 GHz |
| 輸出數量 |
14 個差分 |
| RMS 抖動(12 kHz 至 20 MHz) |
≤ 100 fs |
| 相位噪聲(2457.6 MHz,100 kHz 偏移) |
-152 dBc/Hz |
| 供電電壓 |
3.3 V / 1.8 V |
| 封裝 |
64-WQFN(9x9 mm) |
| 工作溫度 |
-40°C 至 +85°C |
核心特性
- 超低抖動:<100 fs RMS(12 kHz–20 MHz)
- 雙 PLL 架構,集成 VCO
- 14 個差分輸出,可編程格式
- 支持抖動清除和頻率合成
- SPI 接口用於配置
- 保持模式(Holdover)
- 低功耗:典型值 1.2 W
典型應用場景
- 5G 基站(例如大規模 MIMO、gNodeB)
- 無線基礎設施(例如小基站、遠程射頻頭)
- 數據轉換器(例如雷達、測試設備的 ADC/DAC 時鐘)
- 網絡設備(例如交換機、路由器、100G 以太網)
- 醫療成像(例如超聲、CT 掃描儀)
- 工業自動化(例如高速數據採集)
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