AD7762

Data Sheet

Rev. A | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

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

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

Timing Diagrams.......................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

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

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

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

AD7762 Interface............................................................................ 14

Reading Data............................................................................... 14

Sharing the Parallel Bus............................................................. 14

Writing to the AD7762 .............................................................. 14

Reading Status and Other Registers......................................... 14

Clocking the AD7762 ................................................................ 15

Example 1 .................................................................................... 15

Example 2 .................................................................................... 15

Driving the AD7762....................................................................... 16

Using the AD7762...................................................................... 17

Bias Resistor Selection ............................................................... 17

Decoupling and Layout Recommendations................................ 18

Supply Decoupling ..................................................................... 19

Additional Decoupling .............................................................. 19

Reference Voltage Filtering ....................................................... 19

Differential Amplifier Components ........................................ 19

Layout Considerations............................................................... 19

Programmable FIR Filter............................................................... 20

Downloading a User-Defined Filter ............................................ 21

Example Filter Download ......................................................... 21

AD7762 Registers ........................................................................... 23

Control Register 1—Reg 0x0001.............................................. 23

Control Register 2—Address 0x0002 ...................................... 23

Status Register (Read Only) ...................................................... 24

Offset Register—Address 0x0003............................................. 24

Gain Register—Address 0x0004............................................... 24

Overrange Register—Address 0x0005..................................... 24

Outline Dimensions....................................................................... 25

Ordering Guide .......................................................................... 25

REVISION HISTORY

1/14—Rev. 0 to Rev. A

Added Exposed Pad Notation, Figure 4 and Table 5…………...7

Change to Figure 31……………………………………………20

Updated Outline Dimensions…………………………………25

8/05—Revision 0: Initial Version