GS4915 Datasheet, PDF (4/27 Pages) Gennum Corporation – ClockCleaner™

Contents
Key Features ........................................................................................................................................................1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 1
Functional Block Diagram ..............................................................................................................................2
Revision History .................................................................................................................................................3
1. Pin Out...............................................................................................................................................................5
1.1 Pin Assignment ..................................................................................................................................5
1.2 Pin Descriptions ................................................................................................................................6
2. Electrical Characteristics ............................................................................................................................9
2.1 Absolute Maximum Ratings ..........................................................................................................9
2.2 DC Electrical Characteristics ........................................................................................................9
2.3 AC Electrical Characteristics ..................................................................................................... 10
3. Detailed Description.................................................................................................................................. 12
3.1 Functional Overview .................................................................................................................... 12
3.2 Clock Inputs ..................................................................................................................................... 12
3.2.1 Differential Clock Input................................................................................................... 13
3.2.2 Single-Ended Clock Input............................................................................................... 13
3.2.3 Input Clock Selection ....................................................................................................... 13
3.2.4 Unused Clock Inputs ........................................................................................................ 13
3.3 Clock Cleaning PLL ....................................................................................................................... 13
3.3.1 Phase Detector.................................................................................................................... 14
3.3.2 Charge Pump....................................................................................................................... 14
3.3.3 Loop Filter ............................................................................................................................ 14
3.3.4 External VCO ...................................................................................................................... 15
3.4 Modes of Operation ...................................................................................................................... 15
3.4.1 Frequency Modes .............................................................................................................. 15
3.4.2 Bypass Modes ..................................................................................................................... 17
3.5 Output Clock Frequency and Jitter ......................................................................................... 18
3.6 Output Skew .................................................................................................................................... 20
3.7 Clock Outputs ................................................................................................................................. 21
3.7.1 Differential Clock Output ............................................................................................... 21
3.7.2 Single-Ended Clock Output ........................................................................................... 21
3.8 Device Reset .................................................................................................................................... 21
3.8.1 Hardware Reset.................................................................................................................. 21
4. Typical Application Circuit ..................................................................................................................... 22
5. References & Relevant Standards ......................................................................................................... 23
6. Package & Ordering Information .......................................................................................................... 24
6.1 Package Dimensions ..................................................................................................................... 24
6.2 Solder Reflow Profiles .................................................................................................................. 25
6.3 Recommended PCB Footprint ................................................................................................... 26
6.4 Packaging Data ............................................................................................................................... 26
6.5 Ordering Information ................................................................................................................... 26
GS4915 ClockCleaner™
Data Sheet
39145 - 5
June 2009
4 of 27