Datasheet AD7796, AD7797 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Low Power 24-Bit Sigma-Delta A/D Converter for Bridge Sensors |
| Pages / Page | 24 / 2 — AD7796/AD7797. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. 3/16—Rev. … |
| Revision | B |
| File Format / Size | PDF / 483 Kb |
| Document Language | English |
AD7796/AD7797. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. 3/16—Rev. A to Rev. B. 8/06—Rev. 0 to Rev. A
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AD7796/AD7797 Data Sheet TABLE OF CONTENTS
Features .. 1 ID Register... 14 Interface ... 1 Offset Register .. 15 Applications ... 1 Full-Scale Register .. 15 Functional Block Diagram .. 1 ADC Circuit Information .. 16 General Description ... 1 Overview ... 16 Revision History ... 2 Digital Interface .. 17 Specifications ... 3 Circuit Description... 20 Timing Characteristics ... 5 Analog Input Channel ... 20 Timing Diagrams .. 6 Bipolar/Unipolar Configuration .. 20 Absolute Maximum Ratings .. 7 Data Output Coding .. 20 Thermal Resistance .. 7 Reference ... 20 ESD Caution .. 7 Reset ... 21 Pin Configuration and Function Descriptions ... 8 Burnout Currents ... 21 RMS Noise and Resolution Specifications .. 9 AVDD Monitor ... 21 Typical Performance Characteristics ... 10 Temperature Monitor .. 21 On-Chip Registers .. 11 Calibration ... 21 Communication Register .. 11 Grounding and Layout .. 22 Status Register ... 12 Applications Information .. 23 Mode Register ... 12 Weigh Scales .. 23 Configuration Register .. 14 Outline Dimensions ... 24 Data Register ... 14 Ordering Guide .. 24
REVISION HISTORY 3/16—Rev. A to Rev. B
Changes to RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 Section and Table 11 ... 12
8/06—Rev. 0 to Rev. A
Changes to Table 1 .. 3 Changes to Figure 5 .. 8 Changes to Table 14 .. 13
7/06—Revision 0: Initial Version
Rev. B | Page 2 of 24 Document Outline FEATURES INTERFACE APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS RMS NOISE AND RESOLUTION SPECIFICATIONS TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATION REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 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 (AD7796)/0x000000 (AD7797) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0x5A (AD7796)/0x5B (AD7797) OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7796)/0x800000 (AD7797) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7796)/0x5XXX00 (AD7797) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read Mode CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE RESET BURNOUT CURRENTS AVDD MONITOR TEMPERATURE MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION WEIGH SCALES OUTLINE DIMENSIONS ORDERING GUIDE
AD7796/AD7797 Data Sheet TABLE OF CONTENTS
Features .. 1 ID Register... 14 Interface ... 1 Offset Register .. 15 Applications ... 1 Full-Scale Register .. 15 Functional Block Diagram .. 1 ADC Circuit Information .. 16 General Description ... 1 Overview ... 16 Revision History ... 2 Digital Interface .. 17 Specifications ... 3 Circuit Description... 20 Timing Characteristics ... 5 Analog Input Channel ... 20 Timing Diagrams .. 6 Bipolar/Unipolar Configuration .. 20 Absolute Maximum Ratings .. 7 Data Output Coding .. 20 Thermal Resistance .. 7 Reference ... 20 ESD Caution .. 7 Reset ... 21 Pin Configuration and Function Descriptions ... 8 Burnout Currents ... 21 RMS Noise and Resolution Specifications .. 9 AVDD Monitor ... 21 Typical Performance Characteristics ... 10 Temperature Monitor .. 21 On-Chip Registers .. 11 Calibration ... 21 Communication Register .. 11 Grounding and Layout .. 22 Status Register ... 12 Applications Information .. 23 Mode Register ... 12 Weigh Scales .. 23 Configuration Register .. 14 Outline Dimensions ... 24 Data Register ... 14 Ordering Guide .. 24
REVISION HISTORY 3/16—Rev. A to Rev. B
Changes to RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 Section and Table 11 ... 12
8/06—Rev. 0 to Rev. A
Changes to Table 1 .. 3 Changes to Figure 5 .. 8 Changes to Table 14 .. 13
7/06—Revision 0: Initial Version
Rev. B | Page 2 of 24 Document Outline FEATURES INTERFACE APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS RMS NOISE AND RESOLUTION SPECIFICATIONS TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATION REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 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 (AD7796)/0x000000 (AD7797) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0x5A (AD7796)/0x5B (AD7797) OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7796)/0x800000 (AD7797) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7796)/0x5XXX00 (AD7797) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read Mode CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE RESET BURNOUT CURRENTS AVDD MONITOR TEMPERATURE MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION WEIGH SCALES OUTLINE DIMENSIONS ORDERING GUIDE
