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时钟和计时
时钟网络同步器

LMK5B12212

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具有集成 2.5GHz BAW VCO、超低抖动、12 路输出、一个 DPLL、二个 APLL 的网络同步器

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LMK5B12212

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产品详情

Function Clock network synchronizer Number of outputs 12 Output type CML, LVCMOS, LVDS, LVPECL RMS jitter (fs) 47 Features JESD204B Output frequency (min) (MHz) 0.000000000001 Output frequency (max) (MHz) 1250 Input type HCSL, LVCMOS, LVDS, LVPECL, XTAL Operating temperature range (°C) -40 to 85 Number of input channels 2
Function Clock network synchronizer Number of outputs 12 Output type CML, LVCMOS, LVDS, LVPECL RMS jitter (fs) 47 Features JESD204B Output frequency (min) (MHz) 0.000000000001 Output frequency (max) (MHz) 1250 Input type HCSL, LVCMOS, LVDS, LVPECL, XTAL Operating temperature range (°C) -40 to 85 Number of input channels 2
VQFN (RGC) 64 81 mm² (9 mm × 9 mm)
  • Ultra-low jitter BAW VCO based Ethernet clocks
    • 13fs typical RMS jitter at 625MHz with 4MHz 1st order high-pass filter (HPF)
    • 24fs typical RMS jitter at 312.5MHz with 4MHz 1st order HPF
    • 42fs typical/ 60fs maximum RMS jitter at 312.5MHz
    • 47fs typical/ 65fs maximum RMS jitter at 156.25MHz

  • 1 high-performance Digital Phase Locked Loop (DPLL) with 2 Analog Phase Locked Loops (APLLs)

    • Programmable DPLL loop filter bandwidth from 1mHz to 4kHz
    • < 1ppt DCO frequency adjustment step size
  • 2 differential or single-ended DPLL inputs
    • 1Hz (1PPS) to 800MHz input frequency
    • Digital Holdover and Hitless Switching
  • 12 differential outputs with programmable HSDS, AC-LVPECL, LVDS and HSCL formats
    • Up to 16 total frequency outputs when configured with 6 LVCMOS frequency outputs on OUT0_P/N, OUT1_P/N, GPIO1, and GPIO2 and 10 differential outputs on OUT2_P/N to OUT11_P/N
    • 1Hz (1PPS) to 1250MHz output frequency with programmable swing and common mode
    • PCIe Gen 1 to 7 compliant
  • I2C or 3-wire/4-wire SPI
  • Ultra-low jitter BAW VCO based Ethernet clocks
    • 13fs typical RMS jitter at 625MHz with 4MHz 1st order high-pass filter (HPF)
    • 24fs typical RMS jitter at 312.5MHz with 4MHz 1st order HPF
    • 42fs typical/ 60fs maximum RMS jitter at 312.5MHz
    • 47fs typical/ 65fs maximum RMS jitter at 156.25MHz

  • 1 high-performance Digital Phase Locked Loop (DPLL) with 2 Analog Phase Locked Loops (APLLs)

    • Programmable DPLL loop filter bandwidth from 1mHz to 4kHz
    • < 1ppt DCO frequency adjustment step size
  • 2 differential or single-ended DPLL inputs
    • 1Hz (1PPS) to 800MHz input frequency
    • Digital Holdover and Hitless Switching
  • 12 differential outputs with programmable HSDS, AC-LVPECL, LVDS and HSCL formats
    • Up to 16 total frequency outputs when configured with 6 LVCMOS frequency outputs on OUT0_P/N, OUT1_P/N, GPIO1, and GPIO2 and 10 differential outputs on OUT2_P/N to OUT11_P/N
    • 1Hz (1PPS) to 1250MHz output frequency with programmable swing and common mode
    • PCIe Gen 1 to 7 compliant
  • I2C or 3-wire/4-wire SPI

The LMK5B12212 is a high-performance network synchronizer and jitter cleaner designed to meet the stringent requirements of ethernet-based networking applications with < 5ns timing accuracy (class D).

The network synchronizer integrates a DPLL to provide hitless switching and jitter attenuation with programmable loop bandwidth (LBW) and no external loop filters, maximizing flexibility and ease of use. The DPLL phase locks an integrated APLL to the provided reference input.

APLL1 features an ultra high performance PLL with TI’s proprietary Bulk Acoustic Wave (BAW) technology (known as the BAW APLL) and can generate 312.5MHz output clocks with 42fs typical / 60fs maximum RMS jitter irrespective of the DPLL reference input frequency and jitter characteristics. APLL2 provides for a second frequency and/or synchronization domain.

Reference validation circuitry monitors the DPLL reference clocks and performs a hitless switch between inputs upon detecting a switchover event. Zero-Delay Mode (ZDM) and phase cancellation can be enabled to control the phase relationship from input to outputs.

The device is fully programmable through I2C or SPI. The integrated EEPROM can be used to customize system start-up clocks. The device also features factory default ROM profiles as fallback options.

The LMK5B12212 is a high-performance network synchronizer and jitter cleaner designed to meet the stringent requirements of ethernet-based networking applications with < 5ns timing accuracy (class D).

The network synchronizer integrates a DPLL to provide hitless switching and jitter attenuation with programmable loop bandwidth (LBW) and no external loop filters, maximizing flexibility and ease of use. The DPLL phase locks an integrated APLL to the provided reference input.

APLL1 features an ultra high performance PLL with TI’s proprietary Bulk Acoustic Wave (BAW) technology (known as the BAW APLL) and can generate 312.5MHz output clocks with 42fs typical / 60fs maximum RMS jitter irrespective of the DPLL reference input frequency and jitter characteristics. APLL2 provides for a second frequency and/or synchronization domain.

Reference validation circuitry monitors the DPLL reference clocks and performs a hitless switch between inputs upon detecting a switchover event. Zero-Delay Mode (ZDM) and phase cancellation can be enabled to control the phase relationship from input to outputs.

The device is fully programmable through I2C or SPI. The integrated EEPROM can be used to customize system start-up clocks. The device also features factory default ROM profiles as fallback options.
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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
应用手册 差分及单端信号的端接指南 PDF | HTML 英语版 PDF | HTML 2025-12-19
用户指南 LMK5B12212 编程人员指南 (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2025-11-25
应用手册 PLL 器件的振荡器电源考虑因素 PDF | HTML 英语版 PDF | HTML 2025-11-19
证书 LMK5B12212EVM EU Declaration of Conformity (DoC) PDF | HTML 2023-9-29

设计与开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

评估板

LMK5B12212EVM — LMK5B12212 评估模块

LMK5B12212 评估模块 (EVM) 用于评估 LMK5B12212 网络时钟发生器和同步器。该 EVM 可用于器件评估、合规性测试和系统原型设计。  LMK5B12212 集成了三个模拟 PLL (APLL) 和三个具有可编程环路带宽的数字 PLL (DPLL)。该 EVM 包含针对时钟输入、振荡器输入和时钟输出的 SMA 连接器，以便将器件连接到 50Ω 测试设备。通过板载 TCXO，可在自由运行、锁定或保持模式下评估 LMK5B12212。通过板载 USB 微控制器 (MCU) 接口，可在 PC 上使用 TICS Pro 软件图形用户界面 (GUI) 来配置该 EVM。TICS (...)

用户指南: PDF | HTML
支持的产品和硬件
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支持软件

TICSPRO-SW — TICS Pro GUI and Live Programming Tool for Clocking Devices

德州仪器 (TI) 时钟和合成器 (TICS) 专业软件用于对具有以下前缀的产品编号的评估模块 (EVM) 进行编程：CDC、LMK 和 LMX。这些产品包括锁相环和电压控制振荡器 (PLL+VCO)、合成器和时钟器件。

支持的产品和硬件
仿真模型

LMK5B33216 Family IBIS model

SNAM295.ZIP (239 KB) - IBIS 模型
支持的产品和硬件
设计工具

CLOCK-PERFDATA-DESIGN — Clock performance data and register settings for clock generators, network synchronizers, jitter cleaners, and other clocking devices.

Configuration, raw phase noise data, noise plots, and register data for common use cases on clock generators, network synchronizers, jitter cleaners, and other clocking devices
支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
VQFN (RGC) 64 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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