Data Sheet

LTC2686

TABLE OF CONTENTS

analog.com

Rev. A | 2 of 45

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

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

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

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

Specifications........................................................ 4

Timing Characteristics........................................7

Absolute Maximum Ratings...................................8

Thermal Resistance........................................... 8

Electrostatic Discharge (ESD) Ratings...............8

ESD Ratings for LTC2686.................................. 8

ESD Caution.......................................................8

Pin Configuration and Function Descriptions........ 9

Typical Performance Characteristics................... 12

Terminology......................................................... 19

Theory of Operation.............................................20

Power-On Reset...............................................20

Power Supply Sequencing............................... 20

Serial Interface................................................. 20

Writing Codes to DACs.................................... 23

Span Selection and Channel Settings..............24

Read Commands............................................. 24

Offset and Gain Adjustment............................. 25

Analog Mux...................................................... 27

Toggle and Dither Operation............................ 28

Daisy-Chain Mode............................................35

Power-Down Mode...........................................35

Asynchronous DAC Update Using LDAC.........37

Fault Detection................................................. 37

Configuration Register......................................38

Reference Modes.............................................38

Voltage Outputs................................................38

Thermal Overload Protection........................... 39

Compensation Pins.......................................... 40

Applications Information...................................... 41

Printed Circuit Board Layout............................ 41

Command Addresses.......................................... 42

Outline Dimensions............................................. 44

Ordering Guide.................................................45

Evaluation Boards............................................ 45

REVISION HISTORY

8/2023—Rev. 0 to Rev. A

Added 64-Ball WLCSP (Universal).................................................................................................................. 1

Changes to Features Section.......................................................................................................................... 1

Changes to Figure 1........................................................................................................................................ 1

Change to General Description Section...........................................................................................................1

Changes to Table 1..........................................................................................................................................4

Changes to Table 4..........................................................................................................................................8

Added Electrostatic Discharge (ESD) Ratings Section....................................................................................8

Added ESD Ratings for LTC2686 Section and Table 5; Renumbered Sequentially........................................ 8

Added Figure 4; Renumbered Sequentially................................................................................................... 10

Added Table 7................................................................................................................................................10

Changes to Figure 26 Caption through Figure 28 Caption............................................................................ 15

Change to Figure 29 Caption.........................................................................................................................16

Added Figure 30 to Figure 33........................................................................................................................ 16

Changes to Figure 47.................................................................................................................................... 20

Changes to Figure 48.................................................................................................................................... 21

Changes to Writing Codes to DACs Section and Table 10............................................................................ 23

Added Table 11.............................................................................................................................................. 23

Change to Table 12 Caption.......................................................................................................................... 23

Change to Figure 51 Caption.........................................................................................................................24

Added Figure 52............................................................................................................................................ 24

Change to Table 20 Caption.......................................................................................................................... 25

Added Table 21..............................................................................................................................................25

Changes to Gain Adjustment Section and Table 23 Caption......................................................................... 26

Added Table 24 and Table 25........................................................................................................................ 26

Change to Figure 53...................................................................................................................................... 28