AD7687

Data Sheet

Rev. E | Page 2 of 26

TABLE OF CONTENTS

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

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

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

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

Revision History ............................................................................... 3

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

Timing Specifications .................................................................. 6

Absolute Maximum Ratings............................................................ 8

Thermal Resistance ...................................................................... 8

ESD Caution.................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Terminology .................................................................................... 10

Typical Performance Characteristics ........................................... 11

Theory of Operation ...................................................................... 14

Circuit Information.................................................................... 14

Converter Operation.................................................................. 14

Typical Connection Diagram ................................................... 15

Analog Input ............................................................................... 16

Driver Amplifier Choice ........................................................... 17

Single-to-Differential Driver .................................................... 17

Voltage Reference Input ............................................................ 17

Power Supply............................................................................... 17

Supplying the ADC from the Reference.................................. 18

Digital Interface.......................................................................... 18

CS Mode, 3-Wire Without BUSY Indicator ........................... 19

CS Mode, 3-Wire with BUSY Indicator .................................. 20

CS Mode, 4-Wire Without BUSY Indicator ........................... 21

CS Mode, 4-Wire with BUSY Indicator .................................. 22

Chain Mode Without BUSY Indicator.................................... 23

Chain Mode with BUSY Indicator........................................... 24

Applications Information .............................................................. 25

Layout .......................................................................................... 25

Evaluating the Performance of the AD7687............................... 25

Outline Dimensions....................................................................... 26

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