ADF4157 AD [Analog Devices], ADF4157 Datasheet - Page 2

• Manufacturer Part Number: ADF4157
• Description: High Resolution 6 GHz Fractional-N Frequency Synthesizer
• Manufacturer: AD [Analog Devices]

ADF4157
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Circuit Description........................................................................... 8
REVISION HISTORY
7/07—Revision 0: Initial Revision
Timing Specifications .................................................................. 4
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Reference Input Section............................................................... 8
RF Input Stage............................................................................... 8
RF INT Divider............................................................................. 8
25-Bit Fixed Modulus .................................................................. 8
INT, FRAC, and R Relationship ................................................. 8
RF R Counter ................................................................................ 8
Phase Frequency Detector (PFD) and Charge Pump.............. 9
MUXOUT and LOCK Detect..................................................... 9
Rev. 0 | Page 2 of 20
Register Maps.................................................................................. 10
Applications Information .............................................................. 17
Outline Dimensions ....................................................................... 19
Input Shift Registers......................................................................9
Program Modes .............................................................................9
FRAC/INT Register (R0) Map.................................................. 11
LSB FRAC Register (R1) Map .................................................. 12
R Divider Register (R2) Map .................................................... 13
Function Register (R3) Map ..................................................... 15
Test Register (R4) Map .............................................................. 16
Initialization Sequence .............................................................. 17
RF Synthesizer: A Worked Example ........................................ 17
Reference Doubler and Reference Divider ............................. 17
Cycle Slip Reduction for Faster Lock Times........................... 17
Spur Mechanisms ....................................................................... 18
Low Frequency Applications .................................................... 18
Filter Design—ADIsimPLL....................................................... 18
Interfacing ................................................................................... 18
PCB Design Guidelines for the Chip Scale Package.............. 18
Ordering Guide .......................................................................... 19