AD7781CRZ-REEL 查看數據表（PDF） - Analog Devices

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AD7781CRZ-REEL

20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC

Analog Devices 

AD7781

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Characteristics ................................................................ 5

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

Pin Configurations and Function Descriptions ........................... 7

Typical Performance Characteristics ............................................. 8

Output Noise and Resolution........................................................ 10

Theory of Operation ...................................................................... 11

Filter, Data Rate, and Settling Time ......................................... 11

REVISION HISTORY

5/09—Revision 0: Initial Version

Gain .............................................................................................. 11

Power-Down/Reset (PDRST) ................................................... 12

Analog Input Channel ............................................................... 12

Bipolar Configuration................................................................ 12

Data Output Coding .................................................................. 12

Reference ..................................................................................... 12

Bridge Power-Down Switch ...................................................... 12

Digital Interface .......................................................................... 13

Applications Information .............................................................. 14

Weigh Scales................................................................................ 14

AD7781 Performance in a Weigh Scale System ......................... 14

EMI Recommendations............................................................. 14

Grounding and Layout .............................................................. 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 16

Rev. 0 | Page 2 of 16

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