Datasheet AD7792, AD7793 (Analog Devices) - 2

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AD7792/AD7793 TABLE OF CONTENTS
Features .. 1 Offset Register .. 19 Applications... 1 Full-Scale Register.. 19 Functional Block Diagram .. 1 ADC Circuit Information.. 20 General Description ... 1 Overview ... 20 Revision History ... 2 Digital Interface.. 21 Specifications... 3 Circuit Description... 24 Timing Characteristics... 6 Analog Input Channel ... 24 Timing Diagrams.. 7 Instrumentation Amplifier.. 24 Absolute Maximum Ratings.. 8 Bipolar/Unipolar Configuration .. 24 ESD Caution.. 8 Data Output Coding .. 24 Pin Configuration and Function Descriptions... 9 Burnout Currents ... 25 Output Noise and Resolution Specifications .. 11 Excitation Currents .. 25 External Reference.. 11 Bias Voltage Generator .. 25 Internal Reference .. 12 Reference ... 25 Typical Performance Characteristics ... 13 Reset ... 25 On-Chip Registers .. 14 AVDD Monitor ... 26 Communications Register... 14 Calibration... 26 Status Register ... 15 Grounding and Layout .. 26 Mode Register ... 15 Applications Information .. 28 Configuration Register .. 17 Temperature Measurement using a Thermocouple... 28 Data Register ... 18 Temperature Measurement using an RTD.. 29 ID Register... 18 Outline Dimensions ... 30 IO Register... 18 Ordering Guide .. 30
REVISION HISTORY 3/07—Rev. A to Rev. B
Updated Format..Universal
4/05—Rev. 0 to Rev. A
Change to Functional Block Diagram ... 1 Changes to Absolute Maximum Ratings..8 Changes to Specifications Section .. 3 Changes to Figure 17...22 Changes to Specifications Endnote 1... 5 Changes to Data Output Coding Section...24 Changes to Table 5, Table 6, and Table 7 ... 11 Changes to Calibration Section ...26 Changes to Table 8, Table 9, and Table 10 ... 12 Changes to Ordering Guide ...30 Changes to Table 16.. 16
10/04—Revision 0: Initial Version
Changes to Overview Section ... 20 Renamed Applications Section to Applications Information... 29 Changes to Ordering Guide .. 30 Rev. B | Page 2 of 32 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUTPUT NOISE AND RESOLUTION SPECIFICATIONS EXTERNAL REFERENCE INTERNAL REFERENCE TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATIONS REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 (AD7792)/0x88 (AD7793) MODE REGISTER RS2, RS1, RS0 = 0, 0, 1; Power-On/Reset = 0x000A CONFIGURATION REGISTER RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710 DATA REGISTER RS2, RS1, RS0 = 0, 1, 1; Power-On/Reset = 0x0000(00) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0xXA (AD7792)/0xXB (AD7793) IO REGISTER RS2, RS1, RS0 = 1, 0, 1; Power-On/Reset = 0x00 OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7792)/0x800000 (AD7793) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7792)/0x5XXX00 (AD7793) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL INSTRUMENTATION AMPLIFIER BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING BURNOUT CURRENTS EXCITATION CURRENTS BIAS VOLTAGE GENERATOR REFERENCE RESET AVDD MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION TEMPERATURE MEASUREMENT USING A THERMOCOUPLE TEMPERATURE MEASUREMENT USING AN RTD OUTLINE DIMENSIONS ORDERING GUIDE