ACS8522BT データシートの表示（PDF） - Semtech Corporation

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ACS8522BT

Synchronous Equipment Timing Source for Stratum 3/4E/4, SMC and Ethernet Systems

Semtech Corporation 

ACS8522BT eSETS

ADVANCED COMMS & SENSING PRELIMINARY

DATASHEET

Table of Contents

Section

Page

About this Datasheet................................................................................................................................................................................. 1

Description .................................................................................................................................................................................................1

Features .....................................................................................................................................................................................................1

References to Standards ..........................................................................................................................................................................1

Pin Diagram ...............................................................................................................................................................................................5

Pin Description ...........................................................................................................................................................................................6

Introduction ................................................................................................................................................................................................8

Overview ............................................................................................................................................................................................9

General Description ...................................................................................................................................................................................9

Input Reference Clock Ports ......................................................................................................................................................... 10

Locking Frequency Modes .................................................................................................................................................... 10

Clock Quality Monitoring ................................................................................................................................................................ 11

Activity Monitoring ................................................................................................................................................................. 12

Frequency Monitoring ........................................................................................................................................................... 13

Selection of Input Reference Clock Source .................................................................................................................................. 14

Forced Control Selection ....................................................................................................................................................... 14

Automatic Control Selection ................................................................................................................................................. 14

Ultra Fast Switching .............................................................................................................................................................. 14

Fast External Switching Mode-SRCSW pin .......................................................................................................................... 15

Output Clock Phase Continuity on Source Switchover ....................................................................................................... 15

Modes of Operation ....................................................................................................................................................................... 15

Free-run Mode ....................................................................................................................................................................... 15

Pre-locked Mode ................................................................................................................................................................... 16

Locked Mode ......................................................................................................................................................................... 16

Lost-phase Mode ................................................................................................................................................................... 16

Holdover Mode ...................................................................................................................................................................... 16

Pre-locked2 Mode ................................................................................................................................................................. 19

DPLL Architecture and Configuration ........................................................................................................................................... 19

TO DPLL Main Features ........................................................................................................................................................ 20

T4 DPLL Main Features ........................................................................................................................................................ 20

TO DPLL Automatic Bandwidth Controls .............................................................................................................................. 20

Phase Detectors .................................................................................................................................................................... 20

Phase Lock/Loss Detection .................................................................................................................................................. 21

Damping Factor Programmability ......................................................................................................................................... 21

Local Oscillator Clock ............................................................................................................................................................ 22

Output Wander ...................................................................................................................................................................... 22

Jitter and Wander Transfer ................................................................................................................................................... 25

Phase Build-out ..................................................................................................................................................................... 25

Input-to-Output Phase Adjustment ....................................................................................................................................... 26

Input Wander and Jitter Tolerance ....................................................................................................................................... 26

Using the DPLLs for Accurate Frequency and Phase Reporting ........................................................................................ 28

MFrSync and FrSync Alignment-SYNC2K ............................................................................................................................. 29

Output Clock Ports ......................................................................................................................................................................... 29

PECL/LVDS Output Port Selection ....................................................................................................................................... 30

Output Frequency Selection and Configuration .................................................................................................................. 30

Power-On Reset .............................................................................................................................................................................. 42

Serial Interface ............................................................................................................................................................................... 42

Register Map ........................................................................................................................................................................................... 45

Register Organization .................................................................................................................................................................... 45

Multi-word Registers ............................................................................................................................................................. 45

Register Access ..................................................................................................................................................................... 45

Interrupt Enable and Clear ................................................................................................................................................... 45

Defaults .................................................................................................................................................................................. 45

Register Descriptions ............................................................................................................................................................................. 49

Revision 1.00/April 2010© Semtech Corp.

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