AD74115H datasheet(2/113 Pages) AD

2 / 113 page

Data Sheet

AD74115H

TABLE OF CONTENTS

analog.com

Rev. 0 | 2 of 113

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

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

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

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

Companion Products............................................. 1

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

Voltage Output....................................................3

Current Output (IOUT) and IOUT with HART.........4

Voltage Input...................................................... 5

Current Input Externally Powered and

Current Input Externally Powered with

HART................................................................6

Current Input Loop Powered and Current

Input Loop Powered with HART....................... 6

Resistance 2-Wire Measurement....................... 7

3-Wire RTD Measurement ................................ 8

4-Wire RTD Measurement ................................ 8

Digital Input Logic...............................................9

Digital Input Loop Powered.............................. 10

Digital Outputs (Sourcing and Sinking).............11

ADC Specifications...........................................13

HART Modem Communications.......................14

General Specifications..................................... 15

Timing Characteristics......................................18

Absolute Maximum Ratings.................................20

Thermal Resistance......................................... 20

Electrostatic Discharge (ESD) Ratings.............20

ESD Caution.....................................................20

Pin Configuration and Function Descriptions...... 21

Typical Performance Characteristics................... 23

Voltage Output..................................................23

Current Output (IOUT)....................................... 24

Resistance Measurement.................................25

Reference.........................................................26

ADC..................................................................27

Digital Output....................................................28

HART—IOUT Mode........................................... 29

Others...............................................................30

Terminology......................................................... 31

ADC Offset Error.............................................. 31

ADC Gain Error................................................ 31

DAC Offset Error.............................................. 31

DAC Bipolar Zero Error.................................... 31

DAC Gain Error................................................ 31

Total Unadjusted Error (TUE)........................... 31

Theory of Operation.............................................32

Robust Architecture..........................................32

Power Supplies and Reference........................32

Device Functions..............................................33

Getting Started................................................. 55

ADC Functionality.............................................57

DAC Functionality.............................................64

Reset Function................................................. 66

Faults and Alerts.............................................. 66

FET Leakage Compensation ...........................66

GPIO_x Pins.....................................................68

SPI....................................................................68

Applications Information...................................... 72

Power and Isolation .........................................72

System Level Block Diagram........................... 73

External Components.......................................75

Board Design and Layout Considerations........76

Software Configurable Input and Output

Registers........................................................ 78

HART Modem Registers................................ 106

Outline Dimensions............................................113

Ordering Guide............................................... 113

Evaluation Boards.......................................... 113

REVISION HISTORY

8/2022—Revision 0: Initial Version

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