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AD7294

Preliminary Technical Data

Rev. PrB | Page 2 of 45

TABLE OF CONTENTS

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

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

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

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

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

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

DAC Specifications....................................................................... 3

ADC Specifications ...................................................................... 4

General Specifications ................................................................. 7

Timing Characteristics,................................................................ 8

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

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

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

Terminology .................................................................................... 12

System Description......................................................................... 13

ADC Information....................................................................... 14

ADC Operation .......................................................................... 14

ADC Transfer Functions ........................................................... 14

Analog Inputs.............................................................................. 15

Digital Inputs .............................................................................. 17

VDRIVE ............................................................................................ 17

DAC Operation........................................................................... 18

Current Sensor............................................................................ 19

Temperature Sensor ................................................................... 20

Reference for ADC/DAC........................................................... 21

Analog Comparator Loop ......................................................... 22

Applications..................................................................................... 23

Typical RF Front-End Application........................................... 23

Gain Control Of PA ................................................................... 24

Analog Comparator Loop ......................................................... 24

Address Point Register............................................................... 25

ADC Channel Allocation.......................................................... 25

Command Register .................................................................... 26

Result Register ............................................................................ 26

TSENSE1, TSENSE2 Result Registers................................................ 28

TSENSEINT Result Register .......................................................... 28

TSENSE Offset Registers ................................................................ 28

Alert Status Registers ................................................................. 28

Channel Sequence Register....................................................... 28

Configuration Register .............................................................. 28

Sample Delay and Bit Trial Delay............................................. 30

Power-Down Register ................................................................ 30

DATAHIGH/DATALOW Register ................................................... 30

Hysteresis Registers.................................................................... 31

Serial Bus Interface......................................................................... 32

General I2C Timing.................................................................... 32

Serial Bus Address Byte ............................................................. 33

Writing/Reading to the AD7294 .............................................. 34

Modes Of Operation ...................................................................... 40

Mode 1 – Command Mode....................................................... 40

Mode 2 – Autocycle Mode ........................................................ 41

Layout and Configuration............................................................. 42

Power Supply Bypassing and Grounding................................ 42

Evaluation Board For the AD7294............................................... 43

Outline Dimensions ....................................................................... 47

REVISION HISTORY

10/05—Revision PrA: Preliminary Version

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