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AD7685

16-Bit, 250 kSPS PulSAR ADC in MSOP/QFN

Analog Devices 

AD7685

TABLE OF CONTENTS

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

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

Application Diagram........................................................................ 1

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

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

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

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

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

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

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

Terminology ...................................................................................... 9

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 13

Circuit Information.................................................................... 13

Converter Operation.................................................................. 13

Typical Connection Diagram ................................................... 14

Analog Inputs.............................................................................. 15

REVISION HISTORY

8/11—Rev. B to Rev. C

Changes to Figure 6 and Table 7..................................................... 8

Updated Outline Dimensions ....................................................... 26

Changes to Ordering Guide .......................................................... 27

3/07—Rev. A to Rev. B

Changes to Features and Table 1 .................................................... 1

Changes to Table 3............................................................................ 4

Moved Figure 3 and Figure 4 to Page............................................. 6

Inserted Figure 6; Renumbered Sequentially................................ 8

Changes to Figure 13 and Figure 14............................................. 11

Changes to Figure 27...................................................................... 14

Changes to Table 9.......................................................................... 16

Changes to Figure 32...................................................................... 17

Changes to Figure 43...................................................................... 22

Changes to Figure 45...................................................................... 23

Updated Outline Dimensions ....................................................... 26

Changes to Ordering Guide .......................................................... 27

Driver Amplifier Choice ........................................................... 16

Voltage Reference Input ............................................................ 16

Power Supply............................................................................... 16

Supplying the ADC from the Reference.................................. 17

Digital Interface.......................................................................... 17

CS Mode 3-Wire, No BUSY Indicator..................................... 18

CS Mode 3-Wire with BUSY Indicator ................................... 19

CS Mode 4-Wire, No BUSY Indicator..................................... 20

CS Mode 4-Wire with BUSY Indicator ................................... 21

Chain Mode, No BUSY Indicator ............................................ 22

Chain Mode with BUSY Indicator........................................... 23

Application Hints ........................................................................... 24

Layout .......................................................................................... 24

Evaluating the Performance of the AD7685............................... 24

True 16-Bit Isolated Application Example .............................. 25

Outline Dimensions ....................................................................... 26

Ordering Guide .......................................................................... 27

12/04—Rev. 0 to Rev. A

Changes to Specifications.................................................................3

Changes to Figure 17 Captions..................................................... 11

Changes to Power Supply Section ................................................ 17

Changes to Digital Interface Section ........................................... 18

Changes to CS Mode 4-Wire No Busy Indicator Section ......... 21

Changes to CS Mode 4-Wire with Busy Indicator Section....... 22

Changes to Chain Mode, No Busy Indicator Section................ 23

Changes to Chain Mode with Busy Indicator Section .............. 24

Added True 16-Bit Isolated Application Example Section ....... 26

Added Figure 47 ............................................................................. 26

Changes to Ordering Guide .......................................................... 28

4/04—Revision 0: Initial Revision

Rev. C | Page 2 of 28

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