AD7705BR-REEL7 データシートの表示（PDF） - Analog Devices

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AD7705BR-REEL7

3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs

Analog Devices 

AD7705/AD7706

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

Rev. C | Page 2 of 44

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