Datasheet

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
I
2
C Serial Data Interface ............................................................ 20
I
2
C 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