AD7190 데이터 시트보기 (PDF) - Analog Devices

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AD7190

4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA

Analog Devices 

AD7190

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Characteristics ................................................................ 7

Circuit and Timing Diagrams..................................................... 7

Absolute Maximum Ratings............................................................ 9

Thermal Resistance ...................................................................... 9

ESD Caution.................................................................................. 9

Pin Configuration and Function Descriptions........................... 10

Typical Performance Characteristics ........................................... 12

RMS Noise and Resolution............................................................ 15

Sinc4 Chop Disabled................................................................... 15

Sinc3 Chop Disabled................................................................... 16

Sinc4 Chop Enabled .................................................................... 17

Sinc3 Chop Enabled .................................................................... 18

On-Chip Registers .......................................................................... 19

Communications Register......................................................... 19

Status Register ............................................................................. 20

Mode Register ............................................................................. 20

Configuration Register .............................................................. 22

Data Register ............................................................................... 24

GPOCON Register ..................................................................... 24

Offset Register............................................................................. 25

REVISION HISTORY

10/08—Revision 0—Initial Version

Full-Scale Register ...................................................................... 25

ADC Circuit Information.............................................................. 26

Overview ..................................................................................... 26

Filter, Output Data Rate, Settling Time................................... 26

Digital Interface .......................................................................... 29

Circuit Description......................................................................... 33

Analog Input Channel ............................................................... 33

PGA .............................................................................................. 33

Bipolar/Unipolar Configuration .............................................. 33

Data Output Coding .................................................................. 33

Clock ............................................................................................ 33

Burnout Currents ....................................................................... 34

Reference ..................................................................................... 34

Reference Detect......................................................................... 34

Reset ............................................................................................. 34

System Synchronization ............................................................ 35

Temperature Sensor ................................................................... 35

Bridge Power-Down Switch ...................................................... 35

Logic Outputs ............................................................................. 35

Enable Parity ............................................................................... 35

Calibration................................................................................... 36

Grounding and Layout .............................................................. 36

Applications Information .............................................................. 38

Weigh Scales................................................................................ 38

Outline Dimensions ....................................................................... 39

Ordering Guide .......................................................................... 39

Rev. 0 | Page 2 of 40

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