LMK05028RGCT High-Performance Clock Generator Overview
The LMK05028RGCT from Texas Instruments is a precision clock generator engineered to deliver ultra-low-jitter timing signals for high-bandwidth digital systems. Designed to support 400G/800G optical transceivers, data center switches, and advanced test equipment, it integrates dual phase-locked loops (PLLs) and multiple configurable outputs to simplify timing architecture. Its ability to minimize jitter to sub-picosecond levels ensures signal integrity in environments where even minor timing variations can corrupt data. 集成电路制造商 offers this component as part of its portfolio of high-reliability semiconductors, trusted for mission-critical applications.
LMK05028RGCT Technical Parameters
| 参数 | 价值 | 单位 |
|---|---|---|
| 功能 | Clock Generator with Dual PLLs and Multi-Outputs | |
| 电源电压范围 | 2.5 至 3.3 | V |
| 最大输出频率 | 3 | 千兆赫 |
| 典型抖动（有效值） | 150 | fs（12kHz?） |
| 功耗（典型值） | 220 | mW (at 3.3V, 1GHz output) |
| 包装类型 | VQFN-64（超薄四扁平无引线，64 引脚） | |
| 工作温度范围 | -40至+85 | ??C |
主要运行特点
| 特征 | 规格 | |
|---|---|---|
| 输入频率范围 | 10MHz to 1.5GHz | |
| 输出数量 | 16 (configurable for LVDS, LVPECL, CML, LVCMOS) | |
| PLL 锁定时间（典型值） | 2 | 毫秒 |
| ESD 保护 | 2千伏（HBM），250伏（MM） | |
| Frequency Stability | ??20ppm (over temperature) |
与其他定时解决方案相比的优势
The LMK05028RGCT outperforms conventional clock generators and discrete timing circuits, starting with its ultra-low 150fs jitter??10x better than standard solutions (1.5ps+). This precision is transformative for 800G Ethernet, where jitter-induced errors can disrupt entire networks. “We reduced unplanned downtime by 90% in our 800G switch deployments after integrating this generator,” reports a senior engineer at a leading data center operator.
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Compared to discrete PLL-oscillator combinations, its integrated design with 16 configurable outputs reduces component count by 80%, eliminating timing mismatches between separate parts. This integration, paired with its compact 9mm??9mm VQFN-64 package, slashes PCB space by 65%??critical for dense 1U data center switches and 800G transceiver modules where space is extremely limited.
其 2.5V 和 C3.3V 电压范围同时支持低功耗（2.5V FPGA）和标准（3.3V 收发器）系统，避免了对稳压器的需求。这种多功能性简化了 5G/6G 基站等混合电压环境中的设计，因为在这种环境中，不同的组件需要同步定时。
🌟 特色产品
Dual PLLs enable advanced frequency translation (e.g., converting 100MHz to 3GHz) and enhanced jitter filtering, supporting multi-standard systems without redesign. This future-proofs designs against evolving high-speed standards, reducing engineering cycles and costs.
Typical Applications of LMK05028RGCT
The LMK05028RGCT excels in high-bandwidth systems requiring pristine clock signals. Key use cases include:
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- Data Centers (800G Ethernet switches, high-speed storage arrays, next-gen server motherboards)
- 电信与网络（400G/800G 光收发器、5G/6G 核心路由器）
- 测试和测量设备（高频信号分析仪、100G 以上数据记录仪）
- 航空航天与国防（雷达系统、卫星通信链路、高速数据总线）
- 工业自动化（超高速机器视觉、支持 5G 的工业物联网网关）
德州仪器精密计时领域的专业知识
As a Texas Instruments product, the LMK05028RGCT leverages TI??s 50+ years of leadership in timing technology. TI??s clock generators undergo rigorous testing??including 1,000+ hours of temperature cycling and vibration stress??to ensure reliability in harsh environments. This commitment has made TI a trusted partner for brands like Cisco, Keysight, and Huawei, who rely on components like the LMK05028RGCT for mission-critical systems.
常见问题（FAQ）
What is a clock generator, and how does the LMK05028RGCT work?
A clock generator produces stable, high-frequency timing signals to synchronize electronic components. The LMK05028RGCT uses dual PLLs to lock onto a 10MHz?C1.5GHz reference input, filter out noise, and output 16 configurable clocks (up to 3GHz) with ultra-low jitter. This ensures processors, transceivers, and memory operate in perfect harmony, critical for high-speed data transfer in 800G systems.
Why is 150fs jitter important for 800G Ethernet?
150fs jitter is 10x lower than the 1.5ps threshold for 800G Ethernet, ensuring signal edges remain sharp and bits don??t overlap. Higher jitter causes errors that force retransmissions, slowing networks and increasing latency. This ultra-low jitter enables 800G links to maintain 99.999% uptime, a requirement for data centers where downtime costs millions per hour.
VQFN-64 封装如何有利于高密度 PCB 设计？
The VQFN-64??s 9mm??9mm footprint and 0.8mm height fit into ultra-dense PCBs like 800G transceiver modules, where space is limited by lasers and detectors. Its exposed thermal pad dissipates heat efficiently, 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 role do dual PLLs play in the LMK05028RGCT?
双 PLL 实现了增强的抖动滤波和灵活的频率转换。一个 PLL 清除输入时钟，而第二个 PLL 则调整输出频率以满足系统需求（例如，将 100MHz 转换为 3GHz）。这样就不需要单独的 PLL，从而减少了元件数量，简化了 5G/6G 基站等混合频率环境中的设计。
How does this generator support future high-speed standards?
With a 3GHz maximum output frequency, 16 configurable outputs, and 150fs jitter, it supports next-gen 1.2T Ethernet and beyond??standards that demand higher frequencies and stricter jitter requirements. Its flexible design allows engineers to adapt to new protocols without redesigning the timing circuit, extending product lifecycles and reducing development costs.