AD7686

Rev. B | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

Specifications..................................................................................... 3

Timing Specifications....................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configurations and Function Descriptions ........................... 7

Terminology ...................................................................................... 8

Typical Performance Characteristics ............................................. 9

Theory of Operation ...................................................................... 12

Circuit Information.................................................................... 12

Converter Operation.................................................................. 12

Typical Connection Diagram ................................................... 13

Analog Input ............................................................................... 14

Driver Amplifier Choice ........................................................... 15

Voltage Reference Input ............................................................ 15

Power Supply............................................................................... 15

Supplying the ADC from the Reference.................................. 16

Digital Interface.......................................................................... 16

CS MODE 3-Wire, No Busy Indicator .................................... 17

CS Mode 3-Wire with Busy Indicator ..................................... 18

CS Mode 4-Wire, No Busy Indicator....................................... 19

CS Mode 4-Wire with Busy Indicator ..................................... 20

Chain Mode, No Busy Indicator .............................................. 21

Chain Mode with Busy Indicator ............................................. 22

Application Hints ........................................................................... 23

Layout .......................................................................................... 23

Evaluating Performance ............................................................ 23

True 16-Bit Isolated Application Example .............................. 24

Outline Dimensions ....................................................................... 25

Ordering Guide .......................................................................... 26

REVISION HISTORY

3/07—Rev. A to Rev. B

Changes to Features and Table 1 .................................................... 1

Changes to Table 3............................................................................ 4

Moved Figure 3 and Figure 4 to Page............................................. 5

Changes to Figure 13 and Figure 15............................................. 10

Changes to Figure 26...................................................................... 13

Changes to Table 8.......................................................................... 15

Changes to Figure 31...................................................................... 16

Changes to Figure 42...................................................................... 21

Changes to Figure 44...................................................................... 22

Updated Outline Dimensions ....................................................... 25

Changes to Ordering Guide .......................................................... 26

4/06—Rev. 0 to Rev. A

Updated Format..................................................................Universal

Updated Outline Dimensions....................................................... 25

Changes to Ordering Guide .......................................................... 26

4/05—Revision 0: Initial Version