Datasheet
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 Configurations and Function Descriptions............................ 8
Te rm i no lo g y .................................................................................... 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