Datasheet

AD9548 Data Sheet
Rev. E | Page 2 of 112
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 ......................................................................... 4
Logic Inputs (M7 to M0, RESET, TDI, TCLK, TMS) .............. 5
Logic Outputs (M7 to M0, IRQ, TDO) ..................................... 5
System Clock Inputs (SYSCLKP/SYSCLKN) ........................... 5
Distribution Clock Inputs (CLKINP/CLKINN) ...................... 6
Reference Inputs (REFA/REFAA to REFD/REFDD) .............. 7
Reference Monitors ...................................................................... 7
Reference Switchover Specifications .......................................... 8
Distribution Clock Outputs (OUT0 to OUT3) ........................ 8
DAC Output Characteristics (DACOUTP/DACOUTN) ....... 9
Time Duration of Digital Functions ........................................ 10
Digital PLL .................................................................................. 10
Digital PLL Lock Detection ...................................................... 10
Holdover Specifications ............................................................. 10
Serial Port Specifications—SPI Mode ...................................... 11
Serial Port Specifications—I
2
C Mode ...................................... 11
Jitter Generation ......................................................................... 12
Absolute Maximum Ratings .......................................................... 14
ESD Caution ................................................................................ 14
Pin Configuration and Function Descriptions ........................... 15
Typical Performance Characteristics ........................................... 18
Input/Output Termination Recommendations .......................... 23
Getting Started ................................................................................ 24
Power-On Reset .......................................................................... 24
Initial Pin Programming ........................................................... 24
Device Register Programming .................................................. 24
Theory of Operation ...................................................................... 26
Overview ...................................................................................... 26
Reference Clock Inputs .............................................................. 27
Reference Monitors .................................................................... 27
Reference Profiles ....................................................................... 28
Reference Switchover ................................................................. 30
Digital PLL (DPLL) Core .......................................................... 32
Direct Digital Synthesizer ......................................................... 34
Tuning Word Processing ........................................................... 35
Loop Control State Machine ..................................................... 36
System Clock Inputs................................................................... 37
SYSCLK PLL Multiplier ............................................................. 38
Clock Distribution ..................................................................... 40
Status and Control .......................................................................... 44
Multifunction Pins (M0 to M7) ............................................... 44
IRQ Pin ........................................................................................ 45
Watchdog Timer ......................................................................... 46
EEPROM ..................................................................................... 46
Serial Control Port ......................................................................... 51
SPI/I²C Port Selection ................................................................ 51
SPI Serial Port Operation .......................................................... 51
I²C Serial Port Operation .......................................................... 56
I/O Programming Registers .......................................................... 59
Buffered/Active Registers .......................................................... 59
Autoclear Registers ...................................................................... 59
Register Access Restrictions ........................................................ 59
Register Map ................................................................................... 60
Register Map Bit Descriptions ...................................................... 70
Serial Port Configuration (Register 0x0000 to Register
0x0005) ........................................................................................ 70
System Clock (Register 0x0100 to Register 0x0108) ............. 71
General Configuration (Register 0x0200 to
Register 0x0214) ......................................................................... 72
DPLL Configuration (Register 0x0300 to
Register 0x031B) ......................................................................... 75
Clock Distribution Output Configuration (Register 0x0400
to Register 0x0419)..................................................................... 77
Reference Input Configuration (Register 0x0500 to
Register 0x0507) ......................................................................... 81
Profile Registers (Register 0x0600 to Register 0x07FF) ........ 83
Operational Controls (Register 0x0A00 to
Register 0x0A10) ........................................................................ 93
Clock Part Serial ID (Register 0x0C00 to
Register 0x0C07) ........................................................................ 98
Status Readback (Register 0x0D00 to Register 0x0D19) ...... 98
Nonvolatile Memory (EEPROM) Control (Register 0x0E00
to Register 0x0E03) .................................................................. 102