AD5122/AD5142

Data Sheet

Rev. 0 | 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—AD5122 .......................................... 3

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

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

Advanced Control Modes ......................................................... 23

EEPROM or RDAC Register Protection................................. 24

INDEP Pin................................................................................... 24

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

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

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

Terminal Voltage Operating Range ......................................... 28

Power-Up Sequence ................................................................... 28

Layout and Power Supply Biasing............................................ 28

Outline Dimensions....................................................................... 29

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

REVISION HISTORY

10/12—Revision 0: Initial Version