Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - AD converter (ADC) External TSSOP 16

AD7993/AD7994

Rev. 0 | Page 2 of 32

TABLE OF CONTENTS

AD7993 Specifications..................................................................... 3

AD7994 Specifications..................................................................... 5

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

Absolute Maximum Ratings............................................................ 9

ESD Caution.................................................................................. 9

Pin Configuration and Pin Function Descriptions.................... 10

Ter mi nolog y .................................................................................... 11

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

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

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

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

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

Internal Register Structure ............................................................ 18

Address Pointer Register ........................................................... 18

Configuration Register .............................................................. 19

Conversion Result Register ....................................................... 20

Limit Registers ............................................................................ 20

Alert Status Register................................................................... 21

Cycle Timer Register.................................................................. 22

Sample Delay and Bit Trial Delay............................................. 22

Serial Interface ................................................................................ 23

Serial Bus Address...................................................................... 23

Writing to the AD7993/AD7994.................................................. 24

Writing to the Address Pointer Register for a Subsequent

Read

.............................................................................................. 24

Writing a Single Byte of Data to the Alert Status Register or

Cycle Register

.............................................................................. 24

Writing Two Bytes of Data to a Limit or Hysteresis

........................................................................................ 24

Reading Data from the AD7993/AD7994................................... 26

Alert/Busy Pin................................................................................. 27

SMBus Alert ................................................................................ 27

Busy .............................................................................................. 27

Placing the AD7993-1/AD7994-1 into High Speed Mode... 27

The Address Select (AS) Pin ..................................................... 27

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

Mode 1—Using the

CONVST

Pin ........................................... 28

Mode 2—Command Mode....................................................... 29

Mode 3—Automatic Cycle Interval Mode.............................. 30

Outline Dimensions ....................................................................... 31

Ordering Guide .......................................................................... 31

Related Parts in I

C-Compatible ADC Product Family........ 31

REVISION HISTORY

10/04—Revision 0: Initial Version