AD9551

Rev. B | Page 2 of 40

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

Revision History ............................................................................... 2

 

Functional Block Diagram .............................................................. 3

 

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

 

Reference Clock Input Characteristics ...................................... 4

 

Output Characteristics................................................................. 4

 

Jitter Characteristics (180 Hz Loop Bandwidth)...................... 5

 

Crystal Oscillator Characteristics............................................... 5

 

Power Consumption .................................................................... 5

 

Logic Input Pins............................................................................ 6

 

RESET Pin ..................................................................................... 6

 

Logic Output Pins......................................................................... 6

 

Serial Control Port ....................................................................... 6

 

Serial Control Port Timing ......................................................... 7

 

Absolute Maximum Ratings............................................................ 8

 

ESD Caution.................................................................................. 8

 

Pin Configuration and Function Descriptions............................. 9

 

Typical Performance Characteristics ........................................... 11

 

Preset Frequency Ratios................................................................. 14

 

Theory of Operation ...................................................................... 16

 

Operating Modes........................................................................ 16

 

Component Blocks..................................................................... 16

 

Holdover Mode........................................................................... 21

 

Jitter Tolerance............................................................................ 21

 

External Loop Filter Capacitor................................................. 21

 

Output/Input Frequency Relationship .................................... 21

 

Calculating Divider Values ....................................................... 22

 

Low Dropout (LDO) Regulators .............................................. 24

 

Applications Information .............................................................. 25

 

Thermal Performance................................................................ 25

 

Serial Control Port ......................................................................... 26

 

Serial Control Port Pin Descriptions....................................... 26

 

Operation of the Serial Control Port ....................................... 26

 

Instruction Word (16 Bits) ........................................................ 27

 

MSB/LSB First Transfers ........................................................... 27

 

Register Map ................................................................................... 29

 

Register Map Descriptions........................................................ 32

 

Outline Dimensions ....................................................................... 40

 

Ordering Guide .......................................................................... 40

 

REVISION HISTORY

9/09—Rev. A to Rev. B

Changes to Table 25........................................................................ 33

6/09—Rev. 0 to Rev. A

Changes to Figure 23...................................................................... 23

4/09—Revision 0: Initial Version