AD9548 datasheet(2/112 Pages) AD

No de pièce	AD9548

Description	Quad/Octal Input Network Clock Generator/Synchronizer

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AD9548

Rev. 0 | 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—I2C 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 ..................................................................... 39

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 .......................................................... 55

I/O Programming Registers .......................................................... 58

Buffered/Active Registers.......................................................... 58

Autoclear Registers..................................................................... 58

Register Access Restrictions...................................................... 59

Register Map ................................................................................... 60

Register Map Bit Descriptions ...................................................... 70

Serial Port Configuration (Register 0000 to

Register 0005) ............................................................................. 70

System Clock (Register 0100 to Register 0108)...................... 71

General Configuration (Register 0200 to Register 0214) ..... 72

DPLL Configuration (Register 0300 to Register 031B)......... 75

Clock Distribution Output Configuration (Register 0400 to

Register 0419) ............................................................................. 77

Reference Input Configuration (Register 0500 to Register

0507)............................................................................................. 81

Profile Registers (Register 0600 to Register 07FF) ................ 83

Operational Controls (Register 0A00 to Register 0A10) ...... 92

Status Readback (Register 0D00 to Register 0D19)............... 97

Nonvolatile Memory (EEPROM) Control (Register 0E00 to

Register 0E03)........................................................................... 100

EEPROM Storage Sequence (Register 0E10 to

Register 0E3F)........................................................................... 101

Power Supply Partitions............................................................... 105

3.3 V Supplies............................................................................ 105

1.8 V Supplies............................................................................ 105

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