AD4020/AD4021/AD4022

Data Sheet

Rev. B | Page 2 of 39

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications .................................................................. 7

Absolute Maximum Ratings............................................................ 9

Thermal Resistance ...................................................................... 9

ESD Caution.................................................................................. 9

Pin Configurations and Function Descriptions ......................... 10

Typical Performance Characteristics ........................................... 11

Terminology .................................................................................... 17

Theory of Operation ...................................................................... 18

Circuit Information.................................................................... 18

Converter Operation.................................................................. 19

Transfer Functions...................................................................... 19

Applications Information .............................................................. 20

Typical Application Diagrams .................................................. 20

Analog Inputs.............................................................................. 21

Driver Amplifier Choice ........................................................... 22

Ease of Drive Features ............................................................... 23

Voltage Reference Input ............................................................ 25

Power Supply............................................................................... 25

Digital Interface.......................................................................... 25

Register Read/Write Functionality........................................... 27

Status Bits .................................................................................... 29

CS Mode, 3-Wire Turbo Mode................................................. 30

CS Mode, 3-Wire Without the Busy Indicator........................... 31

CS Mode, 3-Wire with the Busy Indicator.............................. 32

CS Mode, 4-Wire Turbo Mode................................................. 33

CS Mode, 4-Wire Without the Busy Indicator........................... 34

CS Mode, 4-Wire with the Busy Indicator.............................. 35

Daisy-Chain Mode..................................................................... 36

Layout Guidelines....................................................................... 37

Evaluating the AD4020/AD4021/AD4022 Performance...... 37

Outline Dimensions....................................................................... 38

Ordering Guide .......................................................................... 39

REVISION HISTORY

11/2019—Rev. A to Rev. B

Added AD4021 and AD4022............................................Universal

Added Figure 2; Renumbered Sequentially .................................. 1

Changes to Features Section and General Description Section....... 1

Changes to Specifications Section and Table 1............................. 4

Changes to Timing Specifications Section and Table 2............... 7

Deleted Figure 3; Renumbered Sequentially................................. 8

Changes to Table 3............................................................................ 8

Added Endnote 2, Table 5................................................................ 9

Changes to Absolute Maximum Ratings Section and Thermal

Resistance Section ............................................................................ 9

Changes to Figure 4 and Table 7................................................... 10

Changes to Typical Performance Characteristics Section......... 11

Added Figure 30 and Figure 31..................................................... 15

Changes to Terminology Section.................................................. 17

Changes to Circuit Information Section and Table 8 ................ 18

Changes to Converter Operation Section and Endnote 1 and

Endnote 2, Table 9 .......................................................................... 19

Changes to Typical Application Diagrams Section.................... 20

Changes to Input Overvoltage Clamp Circuit Section.............. 21

Changes to Figure 44, Single to Differential Driver Section, and

High Frequency Input Signals Section ........................................ 23

Changes to High-Z Mode Section, Figure 47 Caption, and

Figure 48 Caption ........................................................................... 24

Deleted Table 12, Table 13, and Table 14; Renumbered

Sequentially ..................................................................................... 25

Changes to Voltage Reference Input Section, Power Supply

Section, and Digital Interface Section ......................................... 25

Added Configuration Register Details Section .......................... 25

Added Serial Clock Frequency Requirements Section, Table 12,

and Table 13; Renumbered Sequentially ..................................... 26

Changes to Register Read/Write Functionality Section, Table 14,

and Figure 49................................................................................... 27

Changes to Figure 50...................................................................... 28

Changed Status Word Section to Status Bits Section................. 29

Changes to Status Bits Section and Table 15............................... 29

Changes to CS Mode, 3-Wire Turbo Mode Section, Figure 54

Caption, and Figure 54 Caption ................................................... 30

Changes to CS Mode, 3-Wire Without the Busy Indicator

Section, Figure 55 Caption, and Figure 56 Caption................... 31

Changes to CS Mode, 3-Wire with the Busy Indicator Section,

Figure 57 Caption, and Figure 58 Caption.................................. 32

Changes to CS Mode, 4-Wire Turbo Mode Section and

Figure 60 Caption........................................................................... 33

Changes to CS Mode, 4-Wire Without the Busy Indicator

Section and Figure 62 Caption ..................................................... 34

Changes to CS Mode, 4-Wire with the Busy Indicator Section

and Figure 64 Caption ................................................................... 35

Changes to Daisy-Chain Mode Section and Figure 66 Caption ... 36