AD7490

Data Sheet

Rev. D | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

Typical Performance Characteristics ............................................. 8

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

Internal Register Structure ............................................................ 12

Control Register.......................................................................... 12

Shadow Register ......................................................................... 14

Theory of Operation ...................................................................... 16

Circuit Information.................................................................... 16

Converter Operation.................................................................. 16

ADC Transfer Function............................................................. 17

Typical Connection Diagram ................................................... 18

Modes of Operation................................................................... 19

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

Power vs. Throughput Rate....................................................... 23

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

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

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

Ordering Guide .......................................................................... 27

REVISION HISTORY

12/12—Rev. C to Rev. D

Changes to Figure 4 and Table 4 ............................................................. 7

Updated Outline Dimensions (Changed CP-32-2 to CP-32-7).....26

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

6/09—Rev. B to Rev. C

5/08—Rev. A to Rev. B

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

Changes to Table 1............................................................................ 3

Changes to Figure 12 and Figure 13............................................. 14

Changes to Figure 14...................................................................... 15

Changes to Reference Section....................................................... 19

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

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

10/02—Rev. 0 to Rev. A

Addition to General Description.....................................................1

Changes to Timing Specification Notes .........................................4

Change to Absolute Maximum Ratings .........................................5

Addition to Ordering Guide ............................................................5

Changes to Typical Performance Characteristics..........................8

Added new Figure 9 ..........................................................................8

Changes to Figure 12 and Figure 14............................................. 11

Changes to Figure 20...................................................................... 13

Changes to Figure 20 to Figure 26................................................ 14

Addition to Analog Input section ................................................ 14

Change to Figure 29 caption ......................................................... 18

Change to Figure 30 to Figure 32 ................................................. 18

Added Application Hints section ................................................. 20

1/02—Revision 0: Initial Version