EVAL-AD7762EB View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-AD7762EB

625 kSPS, 24-Bit, 109 dB Σ−Δ ADC With On-Chip Buffer

Analog Devices 

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AD7762

TABLE OF CONTENTS

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

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

REVISION HISTORY

8/05—Revision 0: Initial Version

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

Rev. 0 | Page 2 of 28

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