Data Sheet
AD4684/AD4685
TABLE OF CONTENTS
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
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
6/2023—Rev. 0 to Rev. A
Changes to Specifications Section.................................................................................................................. 3
Changes to Figure 5........................................................................................................................................ 6
Changes to Figure 33.................................................................................................................................... 16
Changes to Ordering Guide...........................................................................................................................32
7/2022—Revision 0: Initial Version
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