AD9238 datasheet(3/49 Pages) AD

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AD9238

Rev. C | Page 2 of 48

TABLE OF CONTENTS

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

DC Specifications ......................................................................... 4

AC Specifications.......................................................................... 5

Digital Specifications ................................................................... 6

Switching Specifications .............................................................. 6

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

Explanation of Test Levels ........................................................... 7

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

Pin Configuration

s and Function Descriptions............................ 8

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

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

Equivalent Circuits ......................................................................... 15

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

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

Clock Input and Considerations .............................................. 17

Power Dissipation and Standby Mode..................................... 18

Digital Outputs ........................................................................... 18

Timing.......................................................................................... 18

Data Format ................................................................................ 19

Voltage Reference....................................................................... 19

AD9238 LQFP Evaluation Board ................................................. 21

Clock Circuitry ........................................................................... 21

Analog Inputs ............................................................................. 21

Reference Circuitry .................................................................... 21

Digital Control logic .................................................................. 21

Outputs ........................................................................................ 21

LQFP Evaluation Board Bill of Materials (BOM).................. 23

LQFP Evaluation Board Schematics ........................................ 24

LQFP PCB Layers....................................................................... 28

Dual ADC LFCSP PCB.................................................................. 34

Power Connector........................................................................ 34

Analog Inputs ............................................................................. 34

Optional Operational Amplifier .............................................. 34

Clock ............................................................................................ 34

Voltage Reference ....................................................................... 34

Data Outputs............................................................................... 34

LFCSP Evaluation Board Bill of Materials (BOM) ................ 35

LFCSP PCB Schematics............................................................. 36

LFCSP PCB Layers ..................................................................... 39

Thermal Considerations............................................................ 44

Outline Dimensions ....................................................................... 45

Ordering Guide .......................................................................... 46

REVISION HISTORY

11/10—Rev. B to Rev. C

Changes to Absolute Maximum Ratings Section.........................7

Added Figure 4; Renumbered Sequentially ..................................8

Changes to Analog Input Section.................................................16

Deleted Note 1 from Dual ADC LFCSP PCB Section...............34

Changes to Outline Dimensions...................................................45

4/05—Rev. A to Rev. B

Changes to Format and Layout........................................ Universal

Added LFCSP ..................................................................... Universal

Changes to Features and Applications...........................................1

Changes to General Description and Product Highlights ..........1

Changes to Figure 1..........................................................................1

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

Changes to Table 2............................................................................5

Added Digital Specifications...........................................................6

Moved Switching Specifications to ................................................6

Changes to Pin Function Descriptions..........................................8

Changes to Terminology Section .................................................10

Changes to Figure 29......................................................................15

Changes to Clock Input and Considerations Section................17

Changes to Figure 33......................................................................18

Changes to Data Format Section..................................................19

Added AD9238 LQFP Evaluation Board Section ......................21

Added Dual ADC LFCSP PCB Section.......................................34

Added Thermal Considerations Section.....................................44

Updated Outline Dimensions.......................................................45

Changes to Ordering Guide ..........................................................46

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