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