AD9837

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 ................................................................ 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

4/11—Revision 0: Initial Version