AD7949

Rev. A | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications....................................................................... 6

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 10

Terminology .................................................................................... 13

Theory of Operation ...................................................................... 14

Overview...................................................................................... 14

Converter Operation.................................................................. 14

Transfer Functions...................................................................... 15

Typical Connection Diagrams.................................................. 16

Analog Inputs ............................................................................. 17

Driver Amplifier Choice ........................................................... 18

Voltage Reference Output/Input .............................................. 19

Power Supply............................................................................... 20

Supplying the ADC from the Reference.................................. 20

Digital Interface .............................................................................. 21

Configuration Register, CFG .................................................... 22

Read/Write Spanning Conversion Without a

Busy Indicator............................................................................. 23

Read/Write Spanning Conversion with a Busy Indicator..... 24

Application Hints ........................................................................... 25

Layout .......................................................................................... 25

Evaluating AD7949 Performance............................................. 25

Outline Dimensions ....................................................................... 26

Ordering Guide .......................................................................... 26

REVISION HISTORY

5/08—Rev. 0 to Rev. A

Changes to Ordering Guide .......................................................... 26

5/08—Revision 0: Initial Version