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AD7631BCPZ

18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC

Analog Devices 

AD7631

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications .................................................................. 5

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

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

Terminology .................................................................................... 16

Theory of Operation ...................................................................... 17

Overview...................................................................................... 17

Converter Operation.................................................................. 17

Transfer Functions...................................................................... 18

Typical Connection Diagram ................................................... 18

Analog Inputs.............................................................................. 19

REVISION HISTORY

12/12—Rev. A to Rev. B

Changes to Power Sequencing Section........................................ 23

Updated Outline Dimensions ....................................................... 32

Changes to Ordering Guide .......................................................... 32

3/11—Rev. 0 to Rev. A

Changes to Resolution Parameter, Table 2 .................................... 3

Changes to Figure 4 and Table 6..................................................... 8

Added Exposed Pad Notation to Outline Dimensions ............. 32

2/07—Revision 0: Initial Version

Data Sheet

Driver Amplifier Choice ........................................................... 20

Voltage Reference Input/Output .............................................. 21

Power Supplies ............................................................................ 22

Conversion Control ................................................................... 23

Interfaces.......................................................................................... 24

Digital Interface .......................................................................... 24

Parallel Interface ......................................................................... 24

Serial Interface ............................................................................ 25

Master Serial Interface ............................................................... 25

Slave Serial Interface .................................................................. 26

Hardware Configuration ........................................................... 29

Software Configuration ............................................................. 29

Microprocessor Interfacing....................................................... 30

Application Information................................................................ 31

Layout Guidelines....................................................................... 31

Evaluating Performance ............................................................ 31

Outline Dimensions ....................................................................... 32

Ordering Guide .......................................................................... 32

Rev. B | Page 2 of 32

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