ACS8946 Semtech Corporation, ACS8946 Datasheet - Page 2

• Manufacturer Part Number: ACS8946
• Description: Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for Oc-12/stm-4 and GbE
• Manufacturer: Semtech Corporation

Section
Introduction................................................................................................................................................................................................ 1
Block Diagram............................................................................................................................................................................................ 1
Features ..................................................................................................................................................................................................... 1
Table of Contents ...................................................................................................................................................................................... 2
Pin Diagram ............................................................................................................................................................................................... 3
Pin Description........................................................................................................................................................................................... 3
Description ................................................................................................................................................................................................. 8
Electrical Specifications ......................................................................................................................................................................... 24
Package Information .............................................................................................................................................................................. 36
References and Related Standards ...................................................................................................................................................... 38
Abbreviations .......................................................................................................................................................................................... 38
Revision Status/History ......................................................................................................................................................................... 39
Trademark Acknowledgements ............................................................................................................................................................. 39
Notes ....................................................................................................................................................................................................... 39
Ordering Information .............................................................................................................................................................................. 40
Revision 3/November 2006 © Semtech Corp.
Table of Contents
ADVANCED COMMUNICATIONS
Inputs ..................................................................................................................................................................................................8
Outputs ...............................................................................................................................................................................................8
Clock Multiplication ...........................................................................................................................................................................9
Voltage Controlled Oscillator.............................................................................................................................................................9
Jitter Filtering......................................................................................................................................................................................9
Jitter Filtering: Partnering with Semtech Line Card Protection Parts .......................................................................................... 10
Input Jitter Tolerance...................................................................................................................................................................... 10
Jitter Transfer .................................................................................................................................................................................. 10
Phase Noise Performance.............................................................................................................................................................. 11
Lock Detector .................................................................................................................................................................................. 11
PLL Bandwidth Setting ................................................................................................................................................................... 12
Source Switching - State Diagram ................................................................................................................................................. 13
Configuration................................................................................................................................................................................... 13
Output Jitter..................................................................................................................................................................................... 21
System Reset .................................................................................................................................................................................. 21
Layout Recommendations ............................................................................................................................................................. 21
Applications ..................................................................................................................................................................................... 22
Example Schematic ........................................................................................................................................................................ 23
Maximum Ratings ........................................................................................................................................................................... 24
Operating Conditions ...................................................................................................................................................................... 25
Thermal Characteristics ................................................................................................................................................................. 25
AC Characteristics........................................................................................................................................................................... 25
DC Characteristics .......................................................................................................................................................................... 26
Input and Output Interface Terminations...................................................................................................................................... 27
Jitter Performance .......................................................................................................................................................................... 30
Input/Output Timing ....................................................................................................................................................................... 35
Thermal Conditions......................................................................................................................................................................... 37
Disclaimers...................................................................................................................................................................................... 40
Contacts........................................................................................................................................................................................... 40
RC Components Required to Achieve Bandwidth at Given Input Frequencies (Tables 6 to 9). ...................................... 12
Output Configuration............................................................................................................................................................. 13
Example Configuration.......................................................................................................................................................... 14
Table of Contents
FINAL
Page 2
ACS8946 JAM PLL
DATASHEET
www.semtech.com
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