Datasheet

AD5121/AD5141 Data Sheet
Rev. A | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 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
I
2
C Serial Data Interface ............................................................ 22
I
2
C 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
REVISION HISTORY
12/12—Rev. 0 to Rev. A
Changes to Table 10 ........................................................................ 22
10/12—Revision 0: Initial Version