Datasheet AD9248 (Analog Devices) - 3

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AD9248 TABLE OF CONTENTS
Specifications ... 3  Clock Circuitry ... 22  DC Specifications ... 3  Analog Inputs ... 22  AC Specifications .. 5  Reference Circuitry .. 22  Digital Specifications ... 6  Digital Control Logic ... 22  Switching Specifications .. 7  Outputs .. 22  Absolute Maximum Ratings .. 8  LQFP Evaluation Board Bill of Materials (BOM) .. 24  Explanation of Test Levels ... 8  LQFP Evaluation Board Schematics .. 25  ESD Caution .. 8  LQFP PCB Layers ... 29  Pin Configurations and Function Descriptions ... 9  Dual ADC LFCSP PCB .. 35  Terminology .. 11  Power Connector .. 35  Typical Performance Characteristics ... 12  Analog Inputs ... 35  Equivalent Circuits ... 16  Optional Operational Amplifier .. 35  Theory of Operation .. 17  Clock .. 35  Analog Input ... 17  Voltage Reference ... 35  Clock Input and Considerations .. 18  Data Outputs ... 35  Power Dissipation and Standby Mode ... 19  LFCSP Evaluation Board Bill of Materials (BOM) .. 36  Digital Outputs ... 19  LFCSP PCB Schematics ... 37  Timing .. 19  LFCSP PCB Layers ... 40  Data Format .. 20  Thermal Considerations .. 45  Voltage Reference ... 20  Outline Dimensions ... 46  AD9248 LQFP Evaluation Board ... 22  Ordering Guide .. 47 
REVISION HISTORY 11/10—Rev. A to Rev. B
Changes to Terminology ... 11 Changes to Absolute Maximum Ratings Section ... 8 Changes to Figure 22 .. 15 Changes to Figure 3 .. 9 Changes to Clock Input and Considerations Section .. 18 Add Figure 4; Renumbered Sequentially ... 9 Changes to Timing Section ... 19 Changes to Theory of Operation Section and Analog Input Changes to Figure 33 .. 19 Section .. 17 Changes to Data Format Section .. 20 Deleted Note 1 from Dual ADC LFCSP PCB Section ... 35 Changes to Table 10 ... 24 Updated Outline Dimensions ... 46 Changes to Figure 39 .. 25 Changes to Table 13 ... 36
3/05—Rev. 0 to Rev. A
Updated Outline Dimensions ... 46 Added LFCSP .. Universal Changes to Ordering Guide .. 47 Changes to Features .. 1 Changes to Applications .. 1
1/05—Revision 0: Initial Version
Changes to General Description .. 1 Changes to Product Highlights ... 1 Changes to Table 6 .. 10 Rev. B | 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 CONFIGURATIONS 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 AD9248 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