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AD7705BR-REEL 数据表(PDF) 2 Page - Analog Devices

部件名 AD7705BR-REEL
功能描述  3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7705BR-REEL 数据表(HTML) 2 Page - Analog Devices

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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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