Datasheet

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AD9558 Data Sheet

Rev. B | Page 2 of 104

TABLE OF CONTENTS

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

Applications ................................................................................................ 1

General Description .................................................................................. 1

Functional Block Diagram ....................................................................... 1

Revision History ......................................................................................... 3

Specifications .............................................................................................. 4

Supply Voltage ........................................................................................ 4

Supply Current ....................................................................................... 4

Power Dissipation .................................................................................. 5

Logic Inputs (

SYNC

RESET

, PINCONTROL, M7 to M0) .......... 5

Logic Outputs (M7 to M0, IRQ) ........................................................ 6

System Clock Inputs (XOA, XOB) ..................................................... 6

Reference Inputs .................................................................................... 7

Reference Monitors ............................................................................... 8

Reference Switchover Specifications .................................................. 8

Distribution Clock Outputs................................................................. 9

Time Duration of Digital Functions ................................................ 10

Digital PLL ............................................................................................ 11

Digital PLL Lock Detection ............................................................... 11

Holdover Specifications...................................................................... 11

Serial Port Specifications—SPI Mode ............................................. 12

Serial Port Specifications—I

C Mode .............................................. 13

Jitter Generation .................................................................................. 13

Absolute Maximum Ratings .................................................................. 16

ESD Caution ......................................................................................... 16

Pin Configuration and Function Descriptions .................................. 17

Typical Performance Characteristics.................................................... 20

Input/Output Termination Recommendations ................................. 25

Getting Started .......................................................................................... 26

Chip Power Monitor and Startup ..................................................... 26

Multifunction Pins at Reset/Power-Up ........................................... 26

Device Register Programming When Using a Register

Setup File ............................................................................................... 26

Theory of Operation ............................................................................... 29

Overview ............................................................................................... 29

Reference Clock Inputs ...................................................................... 30

Reference Monitors ............................................................................. 30

Reference Profiles ................................................................................ 30

Reference Switchover .......................................................................... 30

Digital PLL (DPLL) Core ................................................................... 31

Loop Control State Machine ............................................................. 34

System Clock (SYSCLK) ......................................................................... 35

System Clock Inputs ............................................................................ 35

System Clock Multiplier ..................................................................... 35

Output PLL (APLL) ................................................................................. 37

Clock Distribution ................................................................................... 38

Clock Dividers ...................................................................................... 38

Output Power-Down .......................................................................... 38

Output Enable ...................................................................................... 38

Output Mode ........................................................................................ 38

Clock Distribution Synchronization ................................................ 38

Frame Synchronization ........................................................................... 40

Reference Configuration in Frame Synchronization Mode ........ 40

Clock Outputs in Frame Synchronization Mode .......................... 40

Control Registers for Frame Synchronization Mode .................... 40

Level Sensitive Mode and One-Shot Mode .................................... 40

M3b Divider/OUT5 Programming in Frame

Synchronization Mode ....................................................................... 41

Status and Control ................................................................................... 42

Multifunction Pins (M7 to M0) ........................................................ 42

Watchdog Timer .................................................................................. 43

EEPROM ............................................................................................... 43

Serial Control Port ................................................................................... 49

SPI/IC Port Selection ......................................................................... 49

SPI Serial Port Operation ................................................................... 49

IC Serial Port Operation ................................................................... 53

Programming the I/O Registers ............................................................ 56

Buffered/Active Registers ................................................................... 56

Autoclear Registers .............................................................................. 56

Thermal Performance ............................................................................. 57

Power Supply Partitions .......................................................................... 58

Recommended Configuration for 3.3 V Switching Supply ......... 58

Configuration for 1.8 V Supply......................................................... 58

Pin Program Function Description ...................................................... 59

Overview of On-Chip ROM Features ............................................. 59

Hard Pin Programming Mode .......................................................... 60

Soft Pin Programming Overview ..................................................... 61