AD5270/AD5271

Data Sheet

Rev. F | Page 2 of 24

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Electrical Characteristics—AD5270 .......................................... 3

Electrical Characteristics—AD5271 .......................................... 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

RDAC Register............................................................................ 18

50-TP Memory Block ................................................................ 18

Write Protection ......................................................................... 18

RDAC and 50-TP Read Operation .......................................... 19

Shut-Down Mode....................................................................... 20

Resistor Performance Mode...................................................... 20

Reset............................................................................................. 20

SDO Pin and Daisy-Chain Operation..................................... 21

RDAC Architecture.................................................................... 21

Programming the Variable Resistor......................................... 22

EXT_CAP Capacitor.................................................................. 22

Terminal Voltage Operating Range ......................................... 22

Power-Up Sequence ................................................................... 22

Outline Dimensions....................................................................... 23

Ordering Guide .......................................................................... 24

REVISION HISTORY

3/13—Rev. E to Rev. F

to 13 nV/√Hz; Table 1...................................................................... 4

to 13 nV/√Hz; Table 4...................................................................... 6

Updated Outline Dimensions....................................................... 23

12/10—Rev. D to Rev. E

Changes to SDO Pin Description................................................. 10

Changes to SDO Pin and Daisy-Chain Operation Section....... 21

11/10—Rev. C to Rev. D

Changes to Figure 25...................................................................... 14

9/10—Rev. B to Rev. C

Changes to Figure 3 Caption........................................................... 7

Changes to Figure 4 Caption........................................................... 8

Deleted Daisy-Chain Operation Section, Added SDO Pin and

Daisy-Chain Operation Section ................................................... 21

5/10—Rev. A to Rev. B

Added LFCSP Throughout ..............................................................1

Changed OTP to 50-TP Throughout..............................................1

Changes to Product Title, Features, and General Description....1

Changes to Table 1.............................................................................3

Added Table 3; Renumbered Sequentially .....................................4

Changes to Table 4.............................................................................5

Added Table 6 ....................................................................................6

Changes to Table 8 and Table 9........................................................9

Added Figure 6 and changes to Table 10..................................... 10

Replaced Typical Performance Characteristics Section ............ 11

Changes to Figure 44...................................................................... 21

Updated Outline Dimensions....................................................... 23

Changes to Ordering Guide.......................................................... 24

3/10—Rev. 0 to Rev. A

Changes to Product Title and General Description.....................1

Changes to Theory of Operation Section...................................14

10/09—Revision 0: Initial Version