AD7994-1 查看數據表（PDF） - Analog Devices

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AD7994-1

4-Channel, 10- and 12-Bit ADCs with I2C-Compatible Interface in 16-Lead TSSOP

Analog Devices 

AD7993/AD7994

TABLE OF CONTENTS

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

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

I2C Timing Specifications ................................................................ 7

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

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

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

Terminology .................................................................................... 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

REVISION HISTORY

10/04—Revision 0: Initial Version

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

Register ........................................................................................ 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 I2C-Compatible ADC Product Family........ 31

Rev. 0 | Page 2 of 32

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