AD5122A/AD5142A

Data Sheet

Rev. A | Page 2 of 32

TABLE OF CONTENTS

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

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

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

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

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

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

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

Electrical Characteristics—AD5142A ....................................... 6

Interface Timing Specifications.................................................. 9

Shift Register and Timing Diagrams ....................................... 10

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

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

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

Pin Configurations and Function Descriptions ......................... 12

Typical Performance Characteristics ........................................... 14

Test Circuits..................................................................................... 19

Theory of Operation ...................................................................... 20

RDAC Register and EEPROM.................................................. 20

Input Shift Register .................................................................... 20

I2C Serial Data Interface............................................................ 20

I2C Address.................................................................................. 20

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

EEPROM or RDAC Register Protection................................. 23

INDEP Pin................................................................................... 23

RDAC Architecture.................................................................... 26

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

Programming the Potentiometer Divider............................... 27

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

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

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

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

Ordering Guide .......................................................................... 29

REVISION HISTORY

12/12—Rev. 0 to Rev. A

Changes to Table 9.......................................................................... 20

10/12—Revision 0: Initial Version