Data Sheet

AD5122A/AD5142A

TABLE OF CONTENTS

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Rev. D | 2 of 29

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

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

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

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

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

Electrical Characteristics—AD5122A................. 3

Electrical Characteristics—AD5142A................. 5

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

Shift Register and Timing Diagrams...................9

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

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

Electrostatic Discharge (ESD) Ratings.............10

ESD Ratings for AD5122A/AD5142A...............10

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

Pin Configurations and Function Descriptions.....11

Typical Performance Characteristics................... 12

Test Circuits......................................................... 17

Theory of Operation.............................................18

RDAC Register and EEPROM......................... 18

Input Shift Register...........................................18

I2C Serial Data Interface.................................. 19

Advanced Control Modes.................................22

EEPROM or RDAC Register Protection...........25

INDEP Pin........................................................ 25

RDAC Architecture........................................... 25

Programming the Variable Resistor..................26

Programming the Potentiometer Divider.......... 26

Terminal Voltage Operating Range.................. 27

Power-Up Sequence........................................ 27

Layout and Power Supply Biasing....................27

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

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

RAB (KΩ), Resolution, and Interface Options... 28

Evaluation Boards............................................ 29

Automotive Products ....................................... 29

REVISION HISTORY

8/2024—Rev. C to Rev. D

Changed Master to Controller and Slave to Target (Throughout).................................................................... 1

Changes to Thermal Resistance Section and Table 6................................................................................... 10

5/2022—Rev. B to Rev. C

Changes to Nominal Resistance Match Parameter, Single-Supply Power Range Parameter, Dual-

Supply Power Range Parameter, and Logic Supply Range Parameter, Table 2........................................... 3

Changes to Nominal Resistance Match Parameter, Single-Supply Power Range Parameter, Dual-

Supply Power Range Parameter, and Logic Supply Range Parameter, Table 3........................................... 5

Deleted FICDM Parameter, Table 5............................................................................................................... 10

Added Electrostatic Discharge (ESD) Ratings Section..................................................................................10

Added ESD Ratings for AD5122A/AD5142A Section, Table 7, and Table 8; Renumbered Sequentially...... 10

Deleted Table 8, Renumbered Sequentially...................................................................................................11

Moved Table 10 and Table 11........................................................................................................................ 18

Added Write Operation Section, Figure 38, and Figure 39; Renumbered Sequentially.................................19

Added EEPROM Write Acknowledge Polling Section................................................................................... 21

Added Read Operation Section and Figure 40.............................................................................................. 21

Moved Table 13, Table 14, and Table 15....................................................................................................... 22

Changes to Table 13......................................................................................................................................22

Changes to Ordering Guide........................................................................................................................... 28

Added RAB (KΩ), Resolution, and Interface Options Section........................................................................ 28