Datasheet

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