AD7764

Data Sheet

Rev. B | Page 2 of 33

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications .................................................................. 6

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

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

Terminology .................................................................................... 15

Theory of Operation ...................................................................... 16

Σ-Δ Modulation and Digital Filtering ..................................... 16

AD7764 Antialias Protection.................................................... 19

Input Structure................................................................................ 20

On-Chip Differential Amplifier ............................................... 21

Modulator Input Structure........................................................ 22

Driving the Modulator Inputs Directly ................................... 22

AD7764 Serial Interface................................................................. 23

Reading Data............................................................................... 23

Reading Status and Other Registers......................................... 23

Writing to the AD7764 .............................................................. 23

Functionality ................................................................................... 24

Synchronization.......................................................................... 24

Overrange Alerts ........................................................................ 24

Power Modes............................................................................... 25

Decimation Rate Pin.................................................................. 25

Daisy-Chaining............................................................................... 26

Reading Data in Daisy-Chain Mode........................................ 26

Writing Data in Daisy-Chain Mode ........................................ 27

Clocking the AD7764 .................................................................... 28

MCLK Jitter Requirements ....................................................... 28

Decoupling and Layout Information........................................... 29

Supply Decoupling ..................................................................... 29

Reference Voltage Filtering ....................................................... 29

Differential Amplifier Components ........................................ 29

Layout Considerations............................................................... 29

Using the AD7764...................................................................... 30

Bias Resistor Selection ............................................................... 30

AD7764 Registers........................................................................... 31

Control Register ......................................................................... 31

Status Register............................................................................. 31

Gain Register—Address 0x0004............................................... 32

Overrange Register—Address 0x0005..................................... 32

Outline Dimensions....................................................................... 33

Ordering Guide .......................................................................... 33

REVISION HISTORY

3/2017—Rev. A to Rev. B

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

Changes to Table 2............................................................................ 3

Changes to Table 3............................................................................ 6

Change to Figure 3 Caption and Figure 4 Caption ...................... 7

Changes to Table 4............................................................................ 8

Changes to Table 5............................................................................ 9

Added Figure 29; Renumbered Sequentially .............................. 14

Changes to Terminology Section.................................................. 15

Changes to Σ-Δ Modulation and Digital Filtering Section

and Table 6....................................................................................... 16

Added Figure 34.............................................................................. 17

Change to Table 7 ........................................................................... 17

Added Table 8 and Table 9 ............................................................ 18

Changes to On-Chip Differential Amplifier Section

and Table 10..................................................................................... 21

Changes to AD7764 Serial Interface Section Title and Reading

Data Section .................................................................................... 23

Changes to Functionality Section Title........................................ 24

Changes to Table 14........................................................................ 25

Changes to Table 15 ....................................................................... 26

Changes to Table 17, Table 18, and Table 19............................... 31

11/2009—Rev. 0 to Rev. A

Changes to Table 2.............................................................................4

Changes to Table 3.............................................................................6

Changes to Table 4.............................................................................8

Changes to Typical Performance Characteristics Section,

Introductory Text ........................................................................... 11

Changes to Σ-Δ Modulation and Digital Filtering Section....... 16

Added AD7764 Antialias Protection Section............................. 17

Changes to Figure 35...................................................................... 19

Added Driving the Modulator Inputs Directly Section, Including

Figure 39 and Figure 40, Renumbered Subsequent Figures ..... 20

Changes to Synchronization Section, Added Figure 41............ 22

Changes to Power Modes Section, Added Figure 44................. 23

Changes to Example 2 Section...................................................... 26

Changes to Using the AD7764 Section........................................ 28

6/2007—Revision 0: Initial Version