AD7992

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

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

I2C Timing Specifications ................................................................ 5

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Pin Function Descriptions...................... 8

Terminology ...................................................................................... 9

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

Circuit Information ........................................................................ 13

Converter Operation.................................................................. 13

Typical Connection Diagram ................................................... 14

Analog Input ............................................................................... 14

Internal Register Structure ............................................................ 16

Address Pointer Register ........................................................... 16

Configuration Register .............................................................. 17

Conversion Result Register ....................................................... 18

Limit Registers ............................................................................ 18

Alert Status Register................................................................... 19

Cycle Timer Register.................................................................. 19

Sample Delay and Bit Trial Delay............................................. 19

Serial Interface ................................................................................ 20

Serial Bus Address...................................................................... 20

Writing to the AD7992 .................................................................. 21

Writing to the Address Pointer Register for a Subsequent

Read.............................................................................................. 21

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

Cycle Register, or Configuration Register............................... 21

Writing Two Bytes of Data to a Limit Register or Hysteresis

Register ........................................................................................ 22

Reading Data from the AD7992................................................... 23

ALERT/BUSY Pin .......................................................................... 24

SMBus ALERT............................................................................ 24

Placing the AD7992-1 into High Speed Mode....................... 24

The Address Select (AS) Pin ..................................................... 24

Modes of Operation ....................................................................... 25

Mode 1—Using the CONVST Pin ........................................... 25

Mode 2 – Command mode....................................................... 26

Mode 3—Automatic Cycle Mode............................................. 27

Outline Dimensions ....................................................................... 28

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

REVISION HISTORY

1/05—Revision 0: Initial Version