AD5121/AD5141

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—AD5121 .......................................... 3

Electrical Characteristics—AD5141 .......................................... 6

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

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

Absolute Maximum Ratings.......................................................... 12

Thermal Resistance .................................................................... 12

ESD Caution................................................................................ 12

Pin Configuration and Function Descriptions........................... 13

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

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

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

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

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

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

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

I2C Serial Data Interface............................................................ 22

I2C Address.................................................................................. 22

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

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

Load RDAC Input Register (LRDAC)..................................... 24

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

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

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

REVISION HISTORY

5/2017—Rev. B to Rev. C

Changes to Figure 7 and Table 9................................................... 13

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

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

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

Change to Automotive Products Section .................................... 30

3/2016—Rev. A to Rev. B

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

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

Added Note 12, Table 2.................................................................... 5

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

Added Note 12, Table 3.................................................................... 8

Changes to Figure 7........................................................................ 13

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

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

Changes to Figure 20...................................................................... 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

12/2012—Rev. 0 to Rev. A

Changes to Table 10 ....................................................................... 22

10/2012—Revision 0: Initial Version