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ADF4351 Datasheet(PDF) 2 Page - Analog Devices |
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ADF4351 Datasheet(HTML) 2 Page - Analog Devices |
2 / 28 page ADF4351 Data Sheet Rev. 0 | Page 2 of 28 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Characteristics ................................................................ 5 Absolute Maximum Ratings............................................................ 6 Transistor Count........................................................................... 6 Thermal Resistance ...................................................................... 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 9 Circuit Description......................................................................... 11 Reference Input Section............................................................. 11 RF N Divider............................................................................... 11 Phase Frequency Detector (PFD) and Charge Pump............ 11 MUXOUT and Lock Detect...................................................... 12 Input Shift Registers................................................................... 12 Program Modes .......................................................................... 12 VCO.............................................................................................. 12 Output Stage................................................................................ 13 Register Maps.................................................................................. 14 Register 0 ..................................................................................... 18 Register 1 ..................................................................................... 18 Register 2 ..................................................................................... 18 Register 3 ..................................................................................... 19 Register 4 ..................................................................................... 20 Register 5 ..................................................................................... 20 Register Initialization Sequence ............................................... 20 RF Synthesizer—A Worked Example ...................................... 21 Reference Doubler and Reference Divider ............................. 21 12-Bit Programmable Modulus................................................ 21 Cycle Slip Reduction for Faster Lock Times........................... 22 Spurious Optimization and Fast Lock..................................... 22 Fast Lock Timer and Register Sequences................................ 22 Fast Lock Example ..................................................................... 22 Fast Lock Loop Filter Topology................................................ 23 Spur Mechanisms ....................................................................... 23 Spur Consistency and Fractional Spur Optimization ........... 24 Phase Resync............................................................................... 24 Applications Information .............................................................. 25 Direct Conversion Modulator .................................................. 25 Interfacing to the ADuC70xx and the ADSP-BF527............. 26 PCB Design Guidelines for a Chip Scale Package ................. 26 Output Matching........................................................................ 27 Outline Dimensions....................................................................... 28 Ordering Guide .......................................................................... 28 REVISION HISTORY 5/12—Revision 0: Initial Version |
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