AD7440/AD7450A

Data Sheet

Rev. D | Page 2 of 27

TABLE OF CONTENTS

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

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

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

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

Product Highlights ........................................................................... 1

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

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 .............................................................................. 19

Reference ..................................................................................... 19

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

Grounding and Layout Hints.................................................... 25

Evaluating the AD7440/AD7450A Performance................... 25

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

Ordering Guide .......................................................................... 27

REVISION HISTORY

7/15—Rev. C to Rev. D

Changes to Figure 34...................................................................... 18

Changes to Power vs. Throughput Rate Section ........................ 24

Deleted Microprocessor and DSP Interfacing Section,

AD7440/AD7450A to ADSP-21xx Section, Table 7, and Figure

45; Renumbered Sequentially ....................................................... 25

Deleted AD7440/AD7450A to TMS320C5x/C54x Section,

Figure 46, AD7440/AD7450A to DSP56xxx Section, and

Figure 47 .......................................................................................... 26

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

Changes to Ordering Guide .......................................................... 28

9/05—Rev. B to Rev. C

Changes to Ordering Guide .......................................................... 28

2/04—Rev. A to Rev. B

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

1/04—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

8/03—Revision 0: Initial Version