AD7682/AD7689

Data Sheet

Rev. H | Page 2 of 35

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

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

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

Typical Performance Characteristics ........................................... 14

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

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

Overview...................................................................................... 18

Converter Operation.................................................................. 18

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

Typical Connection Diagrams.................................................. 20

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

Driver Amplifier Choice............................................................ 23

Voltage Reference Output/Input .............................................. 23

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

Supplying the ADC from the Reference.................................. 25

Digital Interface .............................................................................. 26

Reading/Writing During Conversion, Fast Hosts.................. 26

Reading/Writing After Conversion, Any Speed Hosts.......... 26

Reading/Writing Spanning Conversion, Any Speed Host.... 26

Configuration Register, CFG.................................................... 26

General Timing Without a Busy Indicator ............................. 28

General Timing with a Busy Indicator.................................... 29

Channel Sequencer .................................................................... 30

Read/Write Spanning Conversion Without a Busy

Indicator ...................................................................................... 31

Read/Write Spanning Conversion with a Busy Indicator..... 32

Applications Information .............................................................. 33

Layout .......................................................................................... 33

Evaluating the AD7682/AD7689 Performance ........................ 33

Outline Dimensions....................................................................... 34

Ordering Guide .......................................................................... 35

REVISION HISTORY

8/2017—Rev. G to Rev. H

Changed CP-20-8 to CP-20-10 .................................... Throughout

Change to Product Title................................................................... 1

Updated Outline Dimensions....................................................... 34

Changes to Ordering Guide .......................................................... 35

6/2017—Rev. F to Rev. G

Changed CP-20-10 to CP-20-8 .................................... Throughout

Changes to Table 11........................................................................ 27

Updated Outline Dimensions....................................................... 34

Changes to Ordering Guide .......................................................... 35

4/2016—Rev. E to Rev. F

Changed ADA4841-x to ADA4805-1/ADA4807-1, Table 1....... 1

Added Endnote 6, Table 3; Renumbered Sequentially ................ 6

Changes to Figure 28 and Figure 29............................................. 20

Changes to Table 10........................................................................ 23

Changes to External Reference Section and the Reference

Decoupling Section ........................................................................ 24

Changes to the Supplying the ADC from the Reference Section.. 25

Changes to Ordering Guide .......................................................... 35

1/2015—Rev. D to Rev. E

Added WLCSP (Throughout) .........................................................1

Added WLCSP Signal-to-Noise and SINAD Parameters;

Table 2 .................................................................................................3

48°C/W ...............................................................................................9

Added Figure 6, Figure 7, and Table 8......................................... 12

Changes to Layout Section............................................................ 33

Added Figure 47; Outline Dimensions........................................ 34

Changes to Ordering Guide.......................................................... 35

4/2012—Rev. C to Rev. D

Changes to Figure 27...................................................................... 18

Changed Internal Reference Section to Internal

Reference/Temperature Sensor Section....................................... 21

Changes to Internal Reference/Temperature Sensor Section... 21

Changed External Reference/Temperature Sensor Section to

External Reference Section ........................................................... 22

Changes to External Reference and Internal Buffer Section and

External Reference Section ........................................................... 22

Changes to REF Bit, Function Column, Table 10 ...................... 25

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