Datasheet

AD9557 Data Sheet
Rev. B | Page 2 of 92
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 (
RESET
, A E
SYNC
, PINCONTROL, M3 to
M0A) .............................................................................................. 5
Logic Outputs (M3 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
2
C Mode ...................................... 13
Jitter Generation ......................................................................... 13
Absolute Maximum Ratings .......................................................... 16
ESD Caution ................................................................................ 16
Pin Configuration and Function Descriptions ........................... 17
Typical Performance Characteristics ........................................... 19
Input/Output Termination Recommendations .......................... 24
Getting Started ................................................................................ 25
Chip Power Monitor and Startup ............................................. 25
Multifunction Pins at Reset/Power-Up ................................... 25
Device Register Programming Using a Register Setup File .. 25
Register Programming Overview ............................................. 25
Theory of Operation ...................................................................... 28
Overview ...................................................................................... 28
Reference Clock Inputs .............................................................. 29
Reference Monitors .................................................................... 29
Reference Profiles ....................................................................... 29
Reference Switchover ................................................................. 29
Digital PLL (DPLL) Core .......................................................... 30
Loop Control State Machine ..................................................... 32
System Clock (SYSCLK) ................................................................ 33
System Clock Inputs................................................................... 33
SYStem Clock Multiplier ........................................................... 33
Output PLL (APLL) ....................................................................... 35
Clock Distribution .......................................................................... 36
Clock Dividers ............................................................................ 36
Output Power-Down ................................................................. 36
Output Enable ............................................................................. 36
Output Mode .............................................................................. 36
Clock Distribution Synchronization ........................................ 36
Status and Control .......................................................................... 37
Multifunction Pins (M3 to M0) ............................................... 37
IRQ Pin ........................................................................................ 37
Watchdog Timer ......................................................................... 38
EEPROM ..................................................................................... 38
Serial Control Port ......................................................................... 44
SPI/I²C Port Selection ................................................................ 44
SPI Serial Port Operation .......................................................... 44
I
2
C Serial Port Operation .......................................................... 48
Programming the I/O Registers ................................................... 51
Buffered/Active Registers .......................................................... 51
Autoclear Registers ..................................................................... 51
Register Access Restrictions...................................................... 51
Thermal Performance .................................................................... 52
Power Supply Partitions ................................................................. 53
Recommended Configuration for 3.3 V Switching Supply .. 53
Configuration for 1.8 V Supply ................................................ 53
Pin Program Function Description ............................................. 54
Overview of On-Chip ROM Features ..................................... 54
Hard Pin Programming Mode.................................................. 55
Soft Pin Programming Mode Overview ................................. 55
Register Map ................................................................................... 56
Register Map Bit Descriptions ...................................................... 65
Serial Port Configuration (Register 0x0000 to
Register 0x0005) ......................................................................... 65
Silicon Revision (Register 0x000A) ......................................... 65
Clock Part Serial ID (Register 0x000C to
Register 0x000D) ........................................................................ 65