AD7490

Data Sheet

Rev. E | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Electrostatic Discharge (ESD) 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

Applications Information .............................................................. 26

Grounding and Layout .............................................................. 26

PCB Design Guidelines for Chip Scale Package .................... 26

Evaluating the AD7490 Performance...................................... 26

Outline Dimensions....................................................................... 27

Ordering Guide .......................................................................... 28

Automotive Products................................................................. 28

REVISION HISTORY

8/2021—Rev. D to Rev. E

Added CP-32-3 Package.....................................................Universal

Changes to Title and Features Section...................................................1

Added Applications Section.....................................................................1

Changes to Specification Section and Table 1......................................3

Changes to t3, t7, t8, and t10 Parameters, Table 2....................................5

Changes to Operating Temperature Ranges Parameter and ESD

Parameter, Table 3......................................................................................6

Added Electrostatic Discharge (ESD) Section, ESD Ratings for

AD7490 Section, Table 4, Table 5, and Table 6; Renumbered

Sequentially.................................................................................................6

Changes to Power vs. Throughput Rate Section................................23

Changed Application Hints Section to Applications Information

Section........................................................................................................26

Updated Outline Dimensions ...............................................................27

Changes to Ordering Guide...................................................................28

Added Automotive Products Section ..................................................28

12/2012—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

6/2009—Rev. B to Rev. C

Change to IDD Auto Standby Mode Parameter, Table 1 ............... 4

5/2008—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

10/2002—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

1/2002—Revision 0: Initial Version