AD9551
TABLE OF CONTENTS
Features .............................................................................................. 1
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
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
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
Rev. B | Page 2 of 40
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