AD9681

Data Sheet

Rev. C | Page 2 of 40

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

Product Highlights ........................................................................... 1

 

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

 

Functional Block Diagram .............................................................. 3

 

Specifications..................................................................................... 4

 

DC Specifications ......................................................................... 4

 

AC Specifications.......................................................................... 5

 

Digital Specifications ................................................................... 6

 

Switching Specifications .............................................................. 7

 

Timing Specifications .................................................................. 8

 

Absolute Maximum Ratings.......................................................... 12

 

Thermal Characteristics ............................................................ 12

 

ESD Caution................................................................................ 12

 

Pin Configuration and Function Descriptions........................... 13

 

Typical Performance Characteristics ........................................... 16

 

Equivalent Circuits ......................................................................... 19

 

Theory of Operation ...................................................................... 20

 

Analog Input Considerations.................................................... 20

 

Voltage Reference ....................................................................... 21

 

Clock Input Considerations ...................................................... 22

 

Power Dissipation and Power-Down Mode ........................... 24

 

Digital Outputs and Timing ..................................................... 25

 

Output Test Modes..................................................................... 28

 

Serial Port Interface (SPI).............................................................. 29

 

Configuration Using the SPI..................................................... 29

 

Hardware Interface..................................................................... 30

 

Configuration Without the SPI ................................................ 30

 

SPI Accessible Features.............................................................. 30

 

Memory Map .................................................................................. 31

 

Reading the Memory Map Register Table............................... 31

 

Memory Map .............................................................................. 32

 

Memory Map Register Descriptions........................................ 35

 

Applications Information .............................................................. 38

 

Design Guidelines ...................................................................... 38

 

Power and Ground Recommendations ................................... 38

 

Board Layout Considerations ................................................... 38

 

Clock Stability Considerations ................................................. 39

 

VCM............................................................................................. 39

 

Reference Decoupling................................................................ 39

 

SPI Port ........................................................................................ 39

 

Outline Dimensions ....................................................................... 40

 

Ordering Guide .......................................................................... 40

 

REVISION HISTORY

10/15—Rev. B to Rev. C

Added Endnote 4, Table 4; Renumbered Sequentially ................ 7

Changes to Clock Input Options Section.................................... 23

Changes to Digital Outputs and Timing Section ....................... 27

2/15—Rev. A to Rev. B

Changes to SYNC Timing Requirements Parameter, Table 5 .... 8

Changes to Figure 7........................................................................ 10

Changes to Figure 8........................................................................ 11

Changes to Table 8.......................................................................... 13

Changed AD9515-x to AD9515 ................................................... 23

Changes to Digital Outputs and Timing Section and Table 11 ..... 27

12/13—Rev. 0 to Rev. A

Changes to Ordering Guide .......................................................... 39

11/13—Revision 0: Initial Version