adf4351 Analog Devices, Inc., adf4351 Datasheet - Page 2

• Manufacturer Part Number: adf4351
• Description: Wideband Synthesizer With Integrated Vco Preliminary Technical Data Adf4351
• Manufacturer: Analog Devices, Inc.

ADF4351
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 9
Circuit Description ......................................................................... 11
Register Maps .................................................................................. 14
Timing Characteristics ................................................................ 5
Transistor Count ........................................................................... 6
ESD Caution .................................................................................. 6
Reference Input Section ............................................................. 11
RF N Divider ............................................................................... 11
INT, FRAC, MOD, and R Counter Relationship .................... 11
INT N MODE ............................................................................. 11
R Counter .................................................................................... 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 0 ..................................................................................... 18
Rev. PrC | Page 2 of 28
Applications Information .............................................................. 25
Outline Dimensions ....................................................................... 28
Register 1 ..................................................................................... 18
Register 2 ..................................................................................... 18
Register 3 ..................................................................................... 20
Register 4 ..................................................................................... 20
Register 5 ..................................................................................... 20
Initialization Sequence .............................................................. 21
RF Synthesizer—A Worked Example ...................................... 21
Modulus ....................................................................................... 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—An Example ............................................................ 22
Fast Lock—Loop Filter Topology ............................................. 23
Spur Mechanisms ....................................................................... 23
Spur Consistency and Fractional Spur Optimization ........... 24
Phase Resync ............................................................................... 24
Direct Conversion Modulator .................................................. 25
Interfacing ................................................................................... 26
PCB Design Guidelines for a Chip Scale Package ................. 26
Output Matching ........................................................................ 27
Ordering Guide .......................................................................... 28
Preliminary Technical Data