AD7760

Rev. A | Page 2 of 36

TABLE OF CONTENTS

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

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

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

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

Revision History ............................................................................... 3

Specifications..................................................................................... 4

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

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

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

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

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

Terminology .................................................................................... 11

Typical Performance Characteristics ........................................... 12

Theory of Operation ...................................................................... 18

Modulator Data Output Mode...................................................... 19

Modulator Inputs........................................................................ 19

Modulator Data Output Scaling ............................................... 19

Modulator Data Output Mode Interface ..................................... 20

Clock Divide-by-1 Mode (CDIV = 1) ..................................... 20

Clock Divide-by-2 Mode (CDIV = 0) ..................................... 20

Using the AD7760 in Modulator Output Mode..................... 21

AD7760 Interface............................................................................ 22

Reading Data............................................................................... 22

Reading Status and Other Registers......................................... 22

Sharing the Parallel Bus ............................................................. 22

Synchronization.......................................................................... 22

Writing to the AD7760 .............................................................. 23

Clocking the AD7760 .................................................................... 24

Buffering the MCLK signal....................................................... 24

MCLK Jitter Requirements ....................................................... 24

Driving the AD7760....................................................................... 26

Using the AD7760 ...................................................................... 27

Decoupling and Layout Recommendations................................ 28

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

Additional Decoupling .............................................................. 29

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

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

Bias Resistor Selection ............................................................... 29

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

Exposed Paddle........................................................................... 29

Programmable FIR Filter............................................................... 30

Downloading a User-Defined Filter ............................................ 31

Example Filter Download ......................................................... 31

AD7760 Registers ........................................................................... 33

Control Register 1—Address 0x0001 ...................................... 33

Control Register 2—Address 0x0002 ...................................... 33

Status Register (Read Only) ...................................................... 34

Offset Register—Address 0x0003............................................. 34

Gain Register—Address 0x0004............................................... 34

Overrange Register—Address 0x0005..................................... 34

Outline Dimensions ....................................................................... 35

Ordering Guide .......................................................................... 35