AD7764

Rev. 0 | Page 2 of 32

TABLE OF CONTENTS

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

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

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

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

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

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

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

Timing Diagrams.......................................................................... 7

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 Input Structure ................................................................ 17

On-Chip Differential Amplifier ............................................... 18

Modulator Input Structure........................................................ 19

AD7764 Interface............................................................................ 20

Reading Data............................................................................... 20

Reading Status and Other Registers......................................... 20

Writing to the AD7764 .............................................................. 20

AD7764 Functionality.................................................................... 21

Synchronization.......................................................................... 21

Overrange Alerts ........................................................................ 21

Power Modes............................................................................... 21

Decimation Rate Pin.................................................................. 22

Daisy Chaining ............................................................................... 23

Reading Data in Daisy-Chain Mode ....................................... 23

Writing Data in Daisy-Chain Mode ........................................ 24

Clocking the AD7764 .................................................................... 25

MCLK Jitter Requirements ....................................................... 25

Decoupling and Layout Information ........................................... 26

Supply Decoupling ..................................................................... 26

Reference Voltage Filtering ....................................................... 26

Differential Amplifier Components ........................................ 26

Layout Considerations............................................................... 26

Using the AD7764 ...................................................................... 27

Bias Resistor Selection ............................................................... 27

AD7764 Registers ........................................................................... 28

Control Register ......................................................................... 28

Status Register............................................................................. 28

Gain Register—Address 0x0004............................................... 29

Overrange Register—Address 0x0005..................................... 29

Outline Dimensions ....................................................................... 30

Ordering Guide .......................................................................... 30

REVISION HISTORY

6/07—Revision 0: Initial Version