Datasheet

AD9837
Data Sheet
Rev. A | 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 ................................................................ 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Test Circuit ........................................................................................ 9
Terminology .................................................................................... 10
Theory of Operation ...................................................................... 11
Circuit Description ......................................................................... 12
Numerically Controlled Oscillator Plus Phase Modulator ... 12
SIN ROM ..................................................................................... 12
Digital-to-Analog Converter (DAC) ....................................... 12
Regulator ...................................................................................... 12
Functional Description .................................................................. 13
Serial Interface ............................................................................ 13
Latency Period ............................................................................ 13
Control Register ......................................................................... 13
Frequency and Phase Registers ................................................ 15
Reset Function ............................................................................ 16
Sleep Function ............................................................................ 16
VOUT Pin ................................................................................... 16
Powering Up the AD9837 ......................................................... 16
Applications Information .............................................................. 19
Grounding and Layout .............................................................. 19
Interfacing to Microprocessors................................................. 19
Evaluation Board ............................................................................ 21
System Demonstration Platform .............................................. 21
AD9837 to SPORT Interface ..................................................... 21
Evaluation Kit ............................................................................. 21
Crystal Oscillator vs. External Clock ....................................... 21
Power Supply ............................................................................... 21
Evaluation Board Schematics ................................................... 22
Evaluation Board Layout ........................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
12/12—Rev. 0 to Rev. A
Changed Input Current, I
INH
/I
INL
from 10 mA to 10 µA .............. 3
Updated Outline Dimensions ....................................................... 25
4/11—Revision 0: Initial Version