Data Sheet

AD5121/AD5141

TABLE OF CONTENTS

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Rev. E | 2 of 30

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

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

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

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

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

Electrical Characteristics—AD5121................... 3

Electrical Characteristics—AD5141................... 5

Interface Timing Specifications.......................... 7

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

Absolute Maximum Ratings................................. 11

Thermal Resistance..........................................11

Electrostatic Discharge (ESD) Ratings.............11

ESD Ratings for AD5121/AD5141....................11

ESD Caution.....................................................11

Pin Configuration and Function Descriptions...... 12

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

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

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

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

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

Serial Data Digital Interface Selection, DIS......20

SPI Serial Data Interface..................................20

I2C Serial Data Interface.................................. 21

Advanced Control Modes.................................24

EEPROM or RDAC Register Protection...........27

Load RDAC Input Register (LRDAC)............... 27

INDEP Pin........................................................ 27

RDAC Architecture........................................... 27

Programming the Variable Resistor..................27

Programming the Potentiometer Divider.......... 28

Terminal Voltage Operating Range.................. 29

Power-Up Sequence........................................ 29

Layout and Power Supply Biasing....................29

Outline Dimensions............................................. 30

Ordering Guide.................................................30

RAB (kΩ), Resolution, and Interface Options....30

Evaluation Boards............................................ 30

Automotive Products ....................................... 30

REVISION HISTORY

7/2024—Rev. D to Rev. E

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

Changes to Thermal Resistance Section and Table 8................................................................................... 11

5/2022—Rev. C to Rev. D

Changes to Single-Supply Power Range Parameter, Dual-Supply Power Range Parameter, and Logic

Supply Range Parameter, Table 2................................................................................................................. 3

Changes to Single-Supply Power Range Parameter, Dual-Supply Power Range Parameter, Logic

Supply Range Parameter, and Power Supply Rejection Ratio Parameter, Table 3....................................... 5

Added Electrostatic Discharge (ESD) Ratings Section.................................................................................. 11

Added ESD Ratings for AD5121/AD5141 Section and Table 9; Renumbered Sequentially.......................... 11

Moved Table 10..............................................................................................................................................19

Change to Table 12 Title................................................................................................................................ 21

Added Write Operation Section, Figure 42 and Figure 43; Renumbered Sequentially..................................21

Added EEPROM Write Acknowledge Polling Section................................................................................... 23

Added Read Operation Section and Figure 44.............................................................................................. 23

Moved Table 12, Table 13, and Table 14....................................................................................................... 24

Added RAB (kΩ), Resolution, and Interface Options Section......................................................................... 30