Data Sheet

AD5122/AD5142

TABLE OF CONTENTS

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Rev. D | 2 of 27

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

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

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

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

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

Electrical Characteristics—AD5122................... 3

Electrical Characteristics—AD5142................... 5

Interface Timing Specifications.......................... 8

Shift Register and Timing Diagrams...................8

Absolute Maximum Ratings.................................10

Thermal Resistance......................................... 10

ESD Caution.....................................................10

Pin Configurations and Function Descriptions.....11

Typical Performance Characteristics................... 13

Test Circuits......................................................... 18

Theory of Operation.............................................19

RDAC Register and EEPROM......................... 19

Input Shift Register...........................................19

SPI Serial Data Interface..................................19

Advanced Control Modes.................................21

EEPROM or RDAC Register Protection...........22

INDEP Pin........................................................ 22

RDAC Architecture........................................... 24

Programming the Variable Resistor..................24

Programming the Potentiometer Divider.......... 25

Terminal Voltage Operating Range.................. 25

Power-Up Sequence........................................ 25

Layout and Power Supply Biasing....................25

Outline Dimensions............................................. 26

Ordering Guide.................................................26

RAB (kΩ), Resolution, and Interface Options....26

Evaluation Boards............................................ 27

Automotive Products........................................ 27

REVISION HISTORY

6/2024—Rev. C to Rev. D

Changes to Thermal Resistance Section and Table 7................................................................................... 10

Changes to Ordering Guide........................................................................................................................... 26

Added RAB (kΩ), Resolution, and Interface Options......................................................................................26