DS31408数据手册集成电路（IC）的应用特定时钟/定时规格书PDF

描述 Description

The DS31408 is a flexible, high-performance timing IC for diverse frequency conversion and frequency synthesis applications. On each of its eight input clocks and 14 output clocks, the device can accept or generate nearly any frequency between 2kHz and 750MHz. The device offers two independent DPLLs to serve two independent clock-generation paths.The input clocks are divided down, fractionally scaled as needed, and continuously monitored for activity and frequency accuracy. The best input clock is selected, manually or automatically, as the reference clock for each of the two flexible, high-performance digital PLLs. Each DPLL lock to the selected reference and provides programmable bandwidth, very high resolution holdover capability and truly hitless switching between input clocks. The digital PLLs are followed by a clock synthesis subsystem that has seven fully programmable digital frequency synthesis blocks, three high-speed low-jitter APLLs, and 14 output clocks, each with its own 32-bit divider and phase adjustment. The APLLs provide fractional scaling and output jitter less than 1ps RMS. For telecom systems, the DS31408 has all required features and functions to serve as a central timing function or as a line card timing IC.In addition the DS31408 has an embedded IEEE® 1588 clock that can be steered by system software to follow a time master elsewhere in the system or elsewhere in the network. This clock has all necessary features to be the central time clock in a 1588 ordinary clock, boundary clock, or transparent clock.Click here for secure documentation

特性 Features

Eight Input Clocks
• Differential or CMOS/TTL Format
• Any Frequency from 2kHz to 750MHz
• Fractional Scaling for 64B/66B and FEC Scaling (e.g., 64/66, 237/255, 238/255) or Any Other Downscaling Requirement
• Continuous Input Clock Quality Monitoring
Two High-Performance DPLLs
• Hitless Reference Switching on Loss of Input
• Automatic or Manual Phase Build-Out
• Holdover on Loss of All Inputs
• Programmable Bandwidth, 0.5mHz to 400Hz
Seven Digital Frequency Synthesizers
• Each Can Slave to Either DPLL
• Produce Any 2kHz Multiple Up to 77.76MHz
Three Output APLLs
• Output Frequencies to 750MHz
• High Resolution Fractional Scaling for FEC and 64B/66B (e.g., 255/237, 255/238, 66/64) or Any Other Scaling Requirement
• Less than 1ps RMS Output Jitter
• Simultaneously Produce Three Low-Jitter Rates from the Same Reference (e.g., 622.08MHz for SONET, 255/237*622.08MHz for OTU2, and 156.25MHz for 10GE)
14 Output Clocks in Seven Groups
• Nearly Any Frequency from IEEE 1588 Clock Features
• Steerable by Software with 2-8ns Time Resolution and 2-32ns Frequency Resolution
• 4ns Input Timestamp Accuracy and Output Edge Placement Accuracy
• Programmable Clock and Time-Alignment I/O to Synchronize All 1588 Devices in Large Systems
• Supports 1588 OC, BC, and TC Architectures
General Features
• Suitable Line Card IC or Timing Card IC for Stratum 2/3E/3/4E/4, SMC, SEC/EEC, or SSU
• Accepts and Produces Nearly Any Frequency from 1Hz Up to 750MHz
• Internal Compensation for Local Oscillator Frequency Error
• SPI™ Processor Interface
• 1.8V Operation with 3.3V I/O (5V Tolerant)
Applications/Uses
• IEEE 1588 Time/Frequency Clocks
• MSPPs
• Routers
• SONET/SDH
• Switches
• Synchronous Ethernet

简介

DS31408属于集成电路（IC）的应用特定时钟/定时。由制造生产的DS31408应用特定时钟/定时专用时钟和计时 IC（集成电路）产品族中的产品主要用于执行与时间或频率信息生成和分配相关的各种操作，适合的设计环境较特定，例如 AMD 和 Intel 的中央处理单元 (CPU) 或图形处理单元 (GPU)、DVD 音频设备、蓝光光盘播放器、以太网设备、PCIe、SATA、光纤通道接口、车载娱乐总线等。