Datasheet

AD5272/AD5274 Data Sheet
Rev. D | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics—AD5272 .......................................... 3
Electrical Characteristics—AD5274 .......................................... 5
Interface Timing Specifications .................................................. 7
Absolute Maximum Ratings ............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution .................................................................................. 9
Pin Configuration and Function Descriptions ........................... 10
Typical Performance Characteristics ........................................... 11
Test Circuits ..................................................................................... 17
Theory of Operation ...................................................................... 18
Serial Data Interface ................................................................... 18
Shift Register ............................................................................... 18
Write Operation.......................................................................... 19
Read Operation........................................................................... 20
RDAC Register ............................................................................ 21
50-TP Memory Block ................................................................ 21
Write Protection ......................................................................... 21
50-TP Memory Write-Acknowledge Polling .......................... 23
Reset ............................................................................................. 23
Resistor Performance Mode ...................................................... 23
Shutdown Mode ......................................................................... 23
RDAC Architecture .................................................................... 23
Programming the Variable Resistor ......................................... 23
EXT_CAP Capacitor .................................................................. 24
Terminal Voltage Operating Range ......................................... 24
Power-Up Sequence ................................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
3/13—Rev. C to Rev. D
Changed Resistor Noise Density, R
AW
= 20 kΩ from 50 nV/√Hz
to 13 nV/√Hz; Table 1 ...................................................................... 4
Changed Resistor Noise Density, R
AW
= 20 kΩ from 50 nV/√Hz
to 13 nV/√Hz; Table 4 ...................................................................... 6
Updated Outline Dimensions ....................................................... 25
11/10—Rev. B to Rev. C
Changes to Figure 24 ...................................................................... 14
5/10—Rev. A to Rev. B
Added LFCSP Package .................................................. Throughout
Changed OTP to 50-TP ................................................ Throughout
Changes to Features Section and Applications Section ............... 1
Added Endnote 1 .............................................................................. 1
Changes to Table 1 ............................................................................ 3
Added Table 3 .................................................................................... 4
Changes to Table 4 ............................................................................ 5
Added Table 6 .................................................................................... 6
Changes to Table 8 and Table 9 ....................................................... 9
Added Figure 5 ................................................................................ 10
Added Exposed Pad Note to Table 10 .......................................... 10
Changes to Typical Performance Characteristics ....................... 11
Changes to Resistor Performance Mode Section ....................... 23
Updated Outline Dimensions ....................................................... 25
Changes to Ordering Guide .......................................................... 26
3/10—Rev. 0 to Rev. A
Changes to Product Title and General Description Section ....... 1
Changes to Theory of Operation Section.................................... 15
10/09—Revision 0: Initial Version