AD9548 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9548

Quad/Octal Input Network Clock Generator/Synchronizer

Analog Devices 

AD9548

Data Sheet

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 M0 to M7 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

Input/Output 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) ... 92

Clock Part Serial ID (Register 0x0C00 to Register 0x0C07) 97

Status Readback (Register 0x0D00 to Register 0x0D19) ...... 97

Nonvolatile Memory (EEPROM) Control (Register 0x0E00 to

Register 0x0E03) ........................................................................ 101

EEPROM Storage Sequence (Register 0x0E10 to

Register 0x0E3F) ........................................................................ 101

Power Supply Partitions............................................................... 106

3.3 V Supplies............................................................................ 106

Rev. G | Page 2 of 111

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