Datasheet AD9238 (Analog Devices) - 3

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AD9238 TABLE OF CONTENTS
Specifications ... 4  Clock Circuitry ... 21  DC Specifications ... 4  Analog Inputs ... 21  AC Specifications .. 5  Reference Circuitry .. 21  Digital Specifications ... 6  Digital Control logic .. 21  Switching Specifications .. 6  Outputs .. 21  Absolute Maximum Ratings .. 7  LQFP Evaluation Board Bill of Materials (BOM) .. 23  Explanation of Test Levels ... 7  LQFP Evaluation Board Schematics .. 24  ESD Caution .. 7  LQFP PCB Layers ... 28  Pin Configurations and Function Descriptions.. 8  Dual ADC LFCSP PCB .. 34  Terminology .. 10  Power Connector .. 34  Typical Performance Characteristics ... 11  Analog Inputs ... 34  Equivalent Circuits ... 15  Optional Operational Amplifier .. 34  Theory of Operation .. 16  Clock .. 34  Analog Input ... 16  Voltage Reference ... 34  Clock Input and Considerations .. 17  Data Outputs ... 34  Power Dissipation and Standby Mode ... 18  LFCSP Evaluation Board Bill of Materials (BOM) .. 35  Digital Outputs ... 18  LFCSP PCB Schematics ... 36  Timing .. 18  LFCSP PCB Layers ... 39  Data Format .. 19  Thermal Considerations .. 44  Voltage Reference ... 19  Outline Dimensions ... 45  AD9238 LQFP Evaluation Board ... 21  Ordering Guide .. 46 
REVISION HISTORY 11/10—Rev. B to Rev. C
Changes to Table 2 .. 5 Changes to Absolute Maximum Ratings Section ... 7 Added Digital Specifications ... 6 Added Figure 4; Renumbered Sequentially .. 8 Moved Switching Specifications to .. 6 Changes to Analog Input Section ... 16 Changes to Pin Function Descriptions .. 8 Deleted Note 1 from Dual ADC LFCSP PCB Section ... 34 Changes to Terminology Section ... 10 Changes to Outline Dimensions ... 45 Changes to Figure 29 .. 15 Changes to Clock Input and Considerations Section .. 17
4/05—Rev. A to Rev. B
Changes to Figure 33 .. 18 Changes to Format and Layout .. Universal Changes to Data Format Section .. 19 Added LFCSP ... Universal Added AD9238 LQFP Evaluation Board Section .. 21 Changes to Features and Applications ... 1 Added Dual ADC LFCSP PCB Section ... 34 Changes to General Description and Product Highlights .. 1 Added Thermal Considerations Section ... 44 Changes to Figure 1 .. 1 Updated Outline Dimensions ... 45 Changes to Table 1 .. 3 Changes to Ordering Guide .. 46 Rev. C | Page 2 of 48 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS AC SPECIFICATIONS DIGITAL SPECIFICATIONS SWITCHING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS EQUIVALENT CIRCUITS THEORY OF OPERATION ANALOG INPUT Differential Input Configurations Single-Ended Input Configuration CLOCK INPUT AND CONSIDERATIONS POWER DISSIPATION AND STANDBY MODE DIGITAL OUTPUTS TIMING DATA FORMAT VOLTAGE REFERENCE Internal Reference Connection External Reference Operation AD9238 LQFP EVALUATION BOARD CLOCK CIRCUITRY ANALOG INPUTS REFERENCE CIRCUITRY DIGITAL CONTROL LOGIC OUTPUTS LQFP EVALUATION BOARD BILL OF MATERIALS (BOM) LQFP EVALUATION BOARD SCHEMATICS LQFP PCB LAYERS DUAL ADC LFCSP PCB POWER CONNECTOR ANALOG INPUTS OPTIONAL OPERATIONAL AMPLIFIER CLOCK VOLTAGE REFERENCE DATA OUTPUTS LFCSP EVALUATION BOARD BILL OF MATERIALS (BOM) LFCSP PCB SCHEMATICS LFCSP PCB LAYERS THERMAL CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE