AD9549 datasheet(2/76 Pages) AD

Part #	AD9549

Description	Dual Input Network Clock Generator/Synchronizer

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Manufacturer	AD [Analog Devices]

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AD9549

Rev. D | Page 2 of 76

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Basic Block Diagram ........................................................................ 1

Revision History ............................................................................... 3

Specifications..................................................................................... 4

DC Specifications ......................................................................... 4

AC Specifications.......................................................................... 6

Absolute Maximum Ratings............................................................ 9

Thermal Resistance ...................................................................... 9

ESD Caution.................................................................................. 9

Pin Configuration and Function Descriptions........................... 10

Typical Performance Characteristics ........................................... 13

Input/Output Termination Recommendations.......................... 16

Theory of Operation ...................................................................... 17

Overview...................................................................................... 17

Digital PLL Core (DPLLC)........................................................ 17

Phase Detector............................................................................ 21

Digital Loop Filter Coefficients................................................ 22

Closed-Loop Phase Offset......................................................... 24

Lock Detection............................................................................ 24

Reference Monitors .................................................................... 26

Reference Switchover ................................................................. 27

Holdover ...................................................................................... 29

Output Frequency Range Control............................................ 32

Reconstruction Filter ................................................................. 32

FDBK_IN Inputs ........................................................................ 33

Reference Inputs ......................................................................... 33

SYSCLK Inputs ........................................................................... 33

Harmonic Spur Reduction ........................................................ 35

Output Clock Drivers and 2× Frequency Multiplier............. 36

Frequency Slew Limiter............................................................. 37

Frequency Estimator.................................................................. 37

Status and Warnings................................................................... 39

Thermal Performance .................................................................... 41

Power-Up......................................................................................... 42

Power-On Reset.......................................................................... 42

Programming Sequence ............................................................ 42

Power Supply Partitioning............................................................. 43

3.3 V Supplies.............................................................................. 43

1.8 V Supplies.............................................................................. 43

Serial Control Port ......................................................................... 44

Serial Control Port Pin Descriptions....................................... 44

Operation of Serial Control Port.............................................. 44

The Instruction Word (16 Bits)................................................ 45

MSB/LSB First Transfers ........................................................... 45

I/O Register Map ............................................................................ 48

I/O Register Descriptions.............................................................. 53

Serial Port Configuration (Register 0x0000 to Register

0x0005) ........................................................................................ 53

Power-Down and Reset (Register 0x0010 to Register 0x0013)

....................................................................................................... 53

System Clock (Register 0x0020 to Register 0x0023) ............. 54

Digital PLL Control and Dividers (Register 0x0100 to

Register 0x0130) ......................................................................... 55

Free-Run (Single-Tone) Mode (Register 0x01A0 to Register

0x01AD) ...................................................................................... 61

Reference Selector/Holdover (Register 0x01C0 to Register

0x01C3)........................................................................................ 62

Doubler and Output Drivers (Register 0x0200 to Register

0x0201) ........................................................................................ 63

Monitor (Register 0x0300 to Register 0x0335)....................... 64

Calibration (User-Accessible Trim) (Register 0x0400 to

Register 0x0410) ......................................................................... 70

Harmonic Spur Reduction (Register 0x0500 to Register

0x0509) ........................................................................................ 71

Applications Information .............................................................. 73

Sample Applications Circuit ..................................................... 73

Outline Dimensions....................................................................... 74

Ordering Guide .......................................................................... 74

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