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AD9520-0BCPZ-REEL7 Datasheet(PDF) 2 Page - Analog Devices |
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AD9520-0BCPZ-REEL7 Datasheet(HTML) 2 Page - Analog Devices |
2 / 84 page AD9520-0 Rev. 0 | Page 2 of 84 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 3 Specifications..................................................................................... 4 Power Supply Requirements ....................................................... 4 PLL Characteristics ...................................................................... 4 Clock Inputs .................................................................................. 7 Clock Outputs ............................................................................... 7 Timing Characteristics ................................................................ 8 Timing Diagrams ..................................................................... 9 Clock Output Additive Phase Noise (Distribution Only; VCO Divider Not Used) ............................................................ 10 Clock Output Absolute Phase Noise (Internal VCO Used).. 11 Clock Output Absolute Time Jitter (Clock Generation Using Internal VCO).................................................................. 11 Clock Output Absolute Time Jitter (Clock Cleanup Using Internal VCO).................................................................. 11 Clock Output Absolute Time Jitter (Clock Generation Using External VCXO) .............................................................. 12 Clock Output Additive Time Jitter (VCO Divider Not Used)..................................................................................... 12 Clock Output Additive Time Jitter (VCO Divider Used) ..... 13 Serial Control Port—SPI Mode ................................................ 13 Serial Control Port—I2C Mode ................................................ 14 PD, SYNC, and RESET Pins ..................................................... 15 Serial Port Setup Pins: SP1, SP0 ............................................... 15 LD, STATUS, and REFMON Pins............................................ 15 Power Dissipation....................................................................... 16 Absolute Maximum Ratings.......................................................... 17 Thermal Resistance .................................................................... 17 ESD Caution................................................................................ 17 Pin Configuration and Function Descriptions........................... 18 Typical Performance Characteristics ........................................... 21 Terminology .................................................................................... 26 Detailed Block Diagram ................................................................ 27 Theory of Operation ...................................................................... 28 Operational Configurations...................................................... 28 Mode 0: Internal VCO and Clock Distribution ................. 28 Mode 1: Clock Distribution or External VCO <1600 MHz ............................................................................. 30 Mode 2: High Frequency Clock Distribution— CLK or External VCO > 1600 MHz .................................... 32 Phase-Locked Loop (PLL) .................................................... 34 Configuration of the PLL ...................................................... 34 Phase Frequency Detector (PFD) ........................................ 34 Charge Pump (CP)................................................................. 35 On-Chip VCO ........................................................................ 35 PLL External Loop Filter....................................................... 35 PLL Reference Inputs............................................................. 35 Reference Switchover............................................................. 36 Reference Divider R............................................................... 36 VCO/VCXO Feedback Divider N: P, A, B, R ..................... 36 Digital Lock Detect (DLD) ................................................... 38 Analog Lock Detect (ALD)................................................... 38 Current Source Digital Lock Detect (CSDLD) .................. 38 External VCXO/VCO Clock Input (CLK/CLK) ................ 39 Holdover.................................................................................. 39 External/Manual Holdover Mode........................................ 39 Automatic/Internal Holdover Mode.................................... 39 Frequency Status Monitors ................................................... 41 VCO Calibration .................................................................... 42 Zero Delay Operation................................................................ 43 Internal Zero Delay Mode..................................................... 43 External Zero Delay Mode.................................................... 43 Clock Distribution ..................................................................... 44 Operation Modes ................................................................... 44 CLK or VCO Direct-to-LVPECL Outputs.......................... 44 Clock Frequency Division..................................................... 45 VCO Divider........................................................................... 45 Channel Dividers ................................................................... 45 Synchronizing the Outputs—SYNC Function ................... 47 LVPECL Output Drivers ....................................................... 49 CMOS Output Drivers .......................................................... 49 |
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