AD9557 datasheet(2/95 Pages) AD

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AD9557

Data Sheet

Rev. C | Page 2 of 95

TABLE OF CONTENTS

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

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

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

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

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

Specifications..................................................................................... 5

Supply Voltage............................................................................... 5

Supply Current.............................................................................. 5

Power Dissipation......................................................................... 6

Logic Inputs (RESET, SYNC, PINCONTROL, M3 to M0).... 6

Logic Outputs (M3 to M0, IRQ) ................................................ 7

System Clock Inputs (XOA, XOB) ............................................. 7

Reference Inputs ........................................................................... 8

Reference Monitors ...................................................................... 9

Reference Switchover Specifications.......................................... 9

Distribution Clock Outputs ...................................................... 10

Time Duration of Digital Functions ........................................ 11

Digital PLL .................................................................................. 12

Digital PLL Lock Detection ...................................................... 12

Holdover Specifications............................................................. 12

Serial Port Specifications—SPI Mode...................................... 13

Serial Port Specifications—I2C Mode...................................... 14

Jitter Generation ......................................................................... 14

Absolute Maximum Ratings.......................................................... 17

ESD Caution................................................................................ 17

Pin Configuration and Function Descriptions........................... 18

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 Using a Register Setup File .....26

Theory of Operation ...................................................................... 30

Overview...................................................................................... 30

Reference Clock Inputs.............................................................. 31

Reference Monitors .................................................................... 31

Reference Profiles ....................................................................... 31

Reference Switchover ................................................................. 31

Digital PLL (DPLL) Core .......................................................... 32

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

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

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

SYStem Clock Multiplier........................................................... 35

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

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

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

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

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

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

Status and Control.......................................................................... 40

Multifunction Pins (M3 to M0) ............................................... 40

IRQ Pin........................................................................................ 40

Watchdog Timer......................................................................... 41

EEPROM ..................................................................................... 41

Serial Control Port ......................................................................... 47

SPI/I²C Port Selection................................................................ 47

SPI Serial Port Operation.......................................................... 47

I2C Serial Port Operation .......................................................... 51

Programming the I/O Registers ................................................... 54

Buffered/Active Registers.......................................................... 54

Autoclear Registers..................................................................... 54

Thermal Performance.................................................................... 55

Power Supply Partitions................................................................. 56

Recommended Configuration for 3.3 V Switching Supply..... 56

Configuration for 1.8 V Supply ................................................ 56

Pin Program Function Description ............................................. 57

Overview of On-Chip ROM Features ..................................... 57

Hard Pin Programming Mode.................................................. 58

Soft Pin Programming Mode Overview ................................. 58

Serial Port Configuration (Register 0x0000 to

Silicon Revision (Register 0x000A) ......................................... 68

Clock Part Serial ID (Register 0x000C to

System Clock (Register 0x0100 to Register 0x0108) ............. 69

General Configuration (Register 0x0200 to

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