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AD7705BR-REEL Datasheet(PDF) 2 Page - Analog Devices |
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AD7705BR-REEL Datasheet(HTML) 2 Page - Analog Devices |
2 / 44 page AD7705/AD7706 Rev. C | Page 2 of 44 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 3 Product Highlights ........................................................................... 4 Specifications..................................................................................... 5 Timing Characteristics ................................................................ 8 Absolute Maximum Ratings............................................................ 9 ESD Caution.................................................................................. 9 Pin Configurations and Function Descriptions ......................... 10 Output Noise (5 V Operation)...................................................... 12 Output Noise (3 V Operation)...................................................... 13 Typical Performance Characteristics ........................................... 14 On-Chip Registers .......................................................................... 16 Communication Register (RS2, RS1, RS0 = 0, 0, 0)............... 16 Setup Register (RS2, RS1, RS0 = 0, 0, 1); Power-On/Reset Status: 01 Hexadecimal .............................................................. 17 Clock Register (RS2, RS1, RS0 = 0, 1, 0); Power-On/Reset Status: 05 Hexadecimal .............................................................. 19 Data Register (RS2, RS1, RS0 = 0, 1, 1) ................................... 20 Test Register (RS2, RS1, RS0 = 1, 0, 0); Power-On/Reset Status: 00 Hexadecimal .............................................................. 20 Zero-Scale Calibration Register (RS2, RS1, RS0 = 1, 1, 0); Power-On/Reset Status: 1F4000 Hexadecimal ........................... 20 Full-Scale Calibration Register (RS2, RS1, RS0 = 1, 1, 1); Power-On/Reset Status: 5761AB HexaDecimal......................... 20 Circuit Description......................................................................... 21 Analog Input ............................................................................... 22 Bipolar/Unipolar Input .............................................................. 22 Reference Input........................................................................... 23 Digital Filtering........................................................................... 23 Analog Filtering.......................................................................... 25 Calibration................................................................................... 25 Theory of Operation ...................................................................... 28 Clocking and Oscillator Circuit ............................................... 28 System Synchronization ............................................................ 28 RESET Input ............................................................................... 29 Standby Mode ............................................................................. 29 Accuracy ...................................................................................... 29 Drift Considerations .................................................................. 29 Power Supplies ............................................................................ 30 Supply Current............................................................................ 30 Grounding and Layout .............................................................. 30 Evaluating the Performance...................................................... 31 Digital Interface.......................................................................... 31 Configuring the AD7705/AD7706 .......................................... 33 Microcomputer/Microprocessor Interfacing ......................... 34 Code For Setting Up the AD7705/AD7706............................ 35 Applications..................................................................................... 38 Pressure Measurement............................................................... 38 Temperature Measurement ....................................................... 39 Smart Transmitters..................................................................... 40 Battery Monitoring .................................................................... 41 Outline Dimensions ....................................................................... 42 Ordering Guide .......................................................................... 43 |
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