AD9557
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
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/IꢀC Port Selection................................................................ 44
SPI Serial Port Operation.......................................................... 44
I2C 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
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Supply Voltage............................................................................... 4
Supply Current.............................................................................. 4
Power Dissipation......................................................................... 5
RESET SYNC
, PINCONTROL, M3 to M0).... 5
Logic Inputs (
,
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—I2C 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
Serial Port Configuration (Register 0x0000 to
Register 0x0005)......................................................................... 65
Silicon Revision (Register 0x000A) ......................................... 65
Clock Part Serial ID (Register 0x000C to
Register 0x000D)........................................................................ 65
System Clock (Register 0x0100 to Register 0x0108) ............. 66
Rev. A | Page 2 of 92
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