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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

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