ADF4158 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADF4158

Direct Modulation/Waveform Generating, 6.1 GHz Fractional-N Frequency Synthesizer

Analog Devices 

ADF4158

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Specifications .................................................................. 4

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Pin Function Descriptions...................... 7

Typical Performance Characteristics ............................................. 8

Circuit Description......................................................................... 10

Reference Input Section............................................................. 10

RF Input Stage............................................................................. 10

RF INT Divider........................................................................... 10

25-Bit Fixed Modulus ................................................................ 10

INT, FRAC, and R Relationship ............................................... 10

R-Counter .................................................................................... 10

Phase Frequency Detector (PFD) and Charge Pump............ 11

MUXOUT and LOCK Detect................................................... 11

Input Shift Registers ................................................................... 11

Program Modes .......................................................................... 11

Register Maps .................................................................................. 12

FRAC/INT Register (R0) Map.................................................. 14

LSB FRAC Register (R1) Map................................................... 15

REVISION HISTORY

4/10—Revision 0: Initial Version

R-Divider Register (R2) Map .................................................... 16

Function Register (R3) Map...................................................... 18

Test Register (R4) Map .............................................................. 20

Deviation Register (R5) Map .................................................... 21

Step Register (R6) Map .............................................................. 22

Delay Register (R7) Map ........................................................... 23

Applications Information .............................................................. 24

Initialization Sequence............................................................... 24

RF Synthesizer: A Worked Example ........................................ 24

Reference Doubler and Reference Divider ............................. 24

Cycle Slip Reduction for Faster Lock Times ........................... 24

Modulation.................................................................................. 25

Waveform Generation ............................................................... 25

Additional Features .................................................................... 27

Fast-Lock Timer and Register Sequences ............................... 30

Fast Lock: An Example .............................................................. 30

Fast Lock: Loop Filter Topology............................................... 30

Spur Mechanisms ....................................................................... 31

Low Frequency Applications .................................................... 31

Filter Design—ADIsimPLL....................................................... 31

PCB Design Guidelines for the Chip Scale Package .............. 31

Application of ADF4158 in FMCW Radar ................................. 32

Outline Dimensions ....................................................................... 33

Ordering Guide........................................................................... 33

Rev. 0 | Page 2 of 36

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