AD4685 datasheet(2/32 Pages) AD

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Data Sheet

AD4684/AD4685

TABLE OF CONTENTS

analog.com

Rev. 0 | 2 of 32

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

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

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

Product Highlights................................................. 1

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

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

Timing Specifications......................................... 5

Absolute Maximum Ratings...................................7

Thermal Resistance........................................... 7

Electrostatic Discharge (ESD) Ratings...............7

ESD Caution.......................................................7

Pin Configuration and Function Descriptions........ 8

Typical Performance Characteristics..................... 9

Terminology......................................................... 13

Differential Nonlinearity (DNL)..........................13

Integral Nonlinearity (INL)................................ 13

Gain Error.........................................................13

Gain Error Temperature Drift............................ 13

Gain Error Match.............................................. 13

Offset Error.......................................................13

Offset Error Temperature Drift.......................... 13

Signal-to-Noise Ratio (SNR)............................ 13

Spurious-Free Dynamic Range (SFDR)...........13

Total Harmonic Distortion (THD)...................... 13

Signal-to-Noise-and-Distortion (SINAD)...........13

Channel to Channel Memory............................13

Power Supply Rejection Ratio (PSRR)............ 13

Aperture Delay................................................. 13

Aperture Jitter...................................................13

Theory of Operation.............................................14

Circuit Information............................................ 14

Converter Operation.........................................14

Analog Input Structure......................................14

ADC Transfer Function.....................................14

Applications Information...................................... 16

Power Supply................................................... 17

Modes of Operation............................................. 18

Channel Selection............................................ 18

Sequencer........................................................18

Oversampling................................................... 19

Resolution Boost.............................................. 21

Alert..................................................................21

Power Modes................................................... 22

Internal and External References.....................22

Software Reset.................................................22

Diagnostic Self Test..........................................22

Interface...............................................................23

Reading Conversion Results............................23

Low Latency Readback....................................24

Reading from Device Registers........................24

Writing to Device Registers.............................. 24

Registers............................................................. 27

Addressing Registers....................................... 28

CONFIGURATION1 Register........................... 28

CONFIGURATION2 Register........................... 29

Alert Register....................................................30

ALERT_LOW_THRESHOLD Register............. 31

ALERT_HIGH_THRESHOLD Register............ 31

Outline Dimensions............................................. 32

Ordering Guide.................................................32

Evaluation Boards............................................ 32

REVISION HISTORY

7/2022—Revision 0: Initial Version

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