AD7440/AD7450A

Rev. B | Page 2 of 28

TABLE OF CONTENTS

AD7440–Specifications.................................................................... 3

AD7450A–Specifications................................................................. 5

Timing Specifications....................................................................... 7

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

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

Pin Configurations and Function Descriptions ........................... 9

Terminology .................................................................................... 10

AD7440/AD7450A–Typical Performance Characteristics ....... 12

Circuit Information ........................................................................ 15

Converter Operation.................................................................. 15

ADC Transfer Function............................................................. 15

Typical Connection Diagram ................................................... 16

Analog Input ............................................................................... 16

Driving Differential Inputs........................................................ 18

Digital Inputs .............................................................................. 20

Reference ..................................................................................... 20

Single-Ended Operation............................................................ 20

Serial Interface ............................................................................ 21

Modes of Operation ....................................................................... 23

Normal Mode.............................................................................. 23

Power-Down Mode .................................................................... 23

Power-Up Time .......................................................................... 24

Power vs. Throughput Rate....................................................... 24

Microprocessor and DSP Interfacing ...................................... 25

Grounding and Layout Hints.................................................... 26

Evaluating the AD7440/AD7450A Performance ................... 26

Outline Dimensions ....................................................................... 27

Ordering Guide............................................................................... 28

REVISION HISTORY

2/04—Data Sheet changed from Rev. A to Rev. B

Added Patent Note .............................................................................. 1

1/04—Data Sheet changed from Rev. 0 to Rev. A

Updated Format.................................................................... Universal

Changes to General Description ....................................................... 1

Changes to Table 1 footnotes ............................................................. 3

Changes to Table 2 footnotes ............................................................. 5

Changes to Table 3 footnotes ............................................................. 7