AD7687

Data Sheet

TABLE OF CONTENTS

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

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

Typical Application Circuit ............................................................. 1

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

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

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

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

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configurations and Function Descriptions ........................... 8

Terminology ...................................................................................... 9

Typical Performance Characteristics ........................................... 10

Circuit Information.................................................................... 13

Converter Operation.................................................................. 13

Typical Connection Diagram.................................................... 14

Analog Input ............................................................................... 15

Driver Amplifier Choice ........................................................... 16

Single-to-Differential Driver .................................................... 16

Voltage Reference Input ............................................................ 16

Power Supply............................................................................... 16

Supplying the ADC from the Reference.................................. 17

Digital Interface.......................................................................... 17

CS MODE 3-Wire, No BUSY Indicator .................................. 18

CS Mode 3-Wire with BUSY Indicator ................................... 19

CS Mode 4-Wire, No BUSY Indicator..................................... 20

CS Mode 4-Wire with BUSY Indicator ................................... 21

Chain Mode, No BUSY Indicator ............................................ 22

Chain Mode with BUSY Indicator........................................... 23

Application Hints ........................................................................... 24

Layout .......................................................................................... 24

Evaluating the Performance of the AD7687............................... 24

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

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

REVISION HISTORY

7/14—Rev. B to Rev. C

Deleted QFN .................................................................. Throughout

Changed Application Diagram Section to Typical Application

Circuit Section .................................................................................. 1

Change to Features Section ............................................................. 1

Added Note 1 .................................................................................... 1

Changes to Figure 27...................................................................... 14

Changes to Evaluating the Performance of the AD7687

Section.............................................................................................. 24

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

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

8/11—Rev. A to Rev. B

Changes to Table 7............................................................................ 7

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

2/11—Rev. 0 to Rev. A

Deleted QFN in Development Note............................ Throughout

Changes to Table 6............................................................................ 7

Added Thermal Resistance Section and Table 7 .......................... 7

Changes to Figure 6 and Table 8..................................................... 8

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

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

4/05—Revision 0: Initial Version

Rev. C | Page 2 of 28