AD5122/AD5142

Data Sheet

Rev. C | 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

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

REVISION HISTORY

5/2017—Rev. B to Rev. C

Changes to Figure 6 and Table 8................................................... 12

Changes to Figure 16 and Figure 17............................................. 15

Changes to EEPROM or RDAC Register Protection Section........ 24

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

Changes to Ordering Guide .......................................................... 30

6/2016—Rev. A to Rev. B

Changes to Features Section............................................................ 1

Changes to Logic Supply Current Parameter, Table 2 ................. 4

Changes to Logic Supply Current Parameter, Table 3 ................. 7

Changes to Figure 16...................................................................... 15

Added Figure 17; Renumbered Sequentially .............................. 15

Changes to Figure 18...................................................................... 16

Change to Linear Gain Setting Mode Section ............................ 23

Changes to RDAC Architecture Section ..................................... 27

Changes to Ordering Guide.......................................................... 30

Added Automotive Products Section .......................................... 30

2/2016—Rev. 0 to Rev. A

Changes to Features Section ............................................................1

Added Endnote, Table 2 ...................................................................5

Added Endnote, Table 3 ...................................................................8

Added Endnote, Table 4 ...................................................................9

Changes to Figure 3 Caption and Figure 4 Caption .................. 10

Changes to Table 6.......................................................................... 11

Changes to Figure 6........................................................................ 12

10/2012—Revision 0: Initial Version