AD7321

Data Sheet

Rev. B | Page 2 of 36

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

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

Terminology .................................................................................... 14

Theory of Operation ...................................................................... 16

Circuit Information.................................................................... 16

Converter Operation.................................................................. 16

Analog Input Structure.............................................................. 17

Typical Connection Diagram ................................................... 19

Analog Input ............................................................................... 19

Driver Amplifier Choice............................................................ 21

Registers........................................................................................... 22

Addressing Registers.................................................................. 22

Control Register ......................................................................... 23

Range Register ............................................................................ 25

Sequencer Operation ..................................................................... 26

Reference ..................................................................................... 27

VDRIVE............................................................................................ 27

Modes of Operation ....................................................................... 28

Normal Mode.............................................................................. 28

Full Shutdown Mode.................................................................. 28

Autoshutdown Mode ................................................................. 29

Autostandby Mode..................................................................... 29

Power vs. Throughput Rate....................................................... 30

Serial Interface ................................................................................ 31

Microprocessor Interfacing........................................................... 32

AD7321 to ADSP-21xx.............................................................. 32

AD7321 to ADSP-BF53x........................................................... 32

Application Hints ........................................................................... 33

Layout and Grounding .............................................................. 33

Power Supply Configuration .................................................... 33

Outline Dimensions....................................................................... 34

Ordering Guide .......................................................................... 34

REVISION HISTORY

12/13—Rev. A to Rev. B

Changes to Circuit Information Section and Table 6 ................ 16

Changes to Addressing Registers Section.................................... 22

Changes to Power Supply Configuration Section ...................... 33

10/09—Rev. 0 to Rev. A

Changes to Table 2............................................................................ 4

Changes to Figure 53...................................................................... 33

Changes to Power Supply Configuration Section ...................... 33

Changes to Table 16........................................................................ 33

Changes to Outline Dimensions................................................... 34

Changes to Ordering Guide .......................................................... 34

1/06—Revision 0: Initial Version