AD7655

Data Sheet

Rev. E | Page 2 of 26

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

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

Terminology............................................................................11

Typical Performance Characteristics .......................................12

Applications Information.........................................................14

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

Modes of Operation.............................................................14

Transfer Functions...............................................................14

Typical Connection Diagram...............................................16

Analog Inputs ......................................................................16

Input Channel Multiplexer ..................................................16

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

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

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

Power Dissipation................................................................17

Conversion Control.............................................................18

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

Parallel Interface..................................................................18

Serial Interface.....................................................................20

Master Serial Interface.........................................................20

Slave Serial Interface............................................................22

Microprocessor Interfacing..................................................24

SPI Interface (ADSP-2191M)...............................................24

Application Hints....................................................................25

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

Evaluating the AD7655 Performance...................................25

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

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

REVISION HISTORY

12/2016—Rev. D to Rev. E

Changed 1 MSPS to 500 kSPS, 888 kSPSto 444 kSPS, and

20 kSPS to 10 kSPS...................................................Throughout

Change to Product Title.............................................................1

Change toMultichannel/Simultaneous Parameter, Table 1........1

Changes to Table 2.....................................................................3

Change to Figure 5.....................................................................8

12/2015—Rev. C to Rev. D

Changed ADSP-219x to ADSP-2191M.....................Throughout

Changes to Figure 18...............................................................15

Changes to Figure 34...............................................................24

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

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

10/2014—Rev. B to Rev. C

Added Figure 5; Renumbered Sequentially................................8

Changes to Table 6...................................................................10

Changes to Power Supply Section............................................17

Changes to Evaluating the AD7655 Performance Section.......25

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

Changes to Ordering Guide.....................................................27

9/2005—Rev. A to Rev. B

Changes to General Description................................................1

Changes to Specifications..........................................................3

Changes to Timing Specifications.............................................5

Changes to Typical Performance Characteristics.....................13

Changes to Figure 17...............................................................15

Added Table 8..........................................................................17

Changes to Figure 28...............................................................21

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

Changes to Ordering Guide.....................................................27

12/2004—Rev. 0 to Rev. A

Changes to Figure 17...............................................................15

Changes to Figure 18...............................................................16

Changes to Voltage Reference Input Section...........................17

Changes to Conversion Control Section..................................18

Changes to Digital Interface Section.......................................18

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

11/2002—Revision 0: Initial Version