AD9785-EBZ datasheet(2/64 Pages) AD

2 / 64 page

AD9785/AD9787/AD9788

Rev. 0 | Page 2 of 64

TABLE OF CONTENTS

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

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

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

Product Highlights ........................................................................... 1

Typical Signal Chain......................................................................... 1

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

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

DC Specifications ......................................................................... 3

Digital Specifications ................................................................... 4

AC Specifications.......................................................................... 5

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

Thermal Resistance ...................................................................... 6

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

Pin Configurations and Function Descriptions ........................... 7

Typical Performance Characteristics ........................................... 13

Terminology .................................................................................... 20

Theory of Operation ...................................................................... 21

Serial Port Interface.................................................................... 21

SPI Register Map............................................................................. 24

SPI Register Descriptions .......................................................... 25

Input Data Ports.............................................................................. 33

Single-Port Mode........................................................................ 33

Dual-Port Mode.......................................................................... 33

Input Data Referenced to DATACLK ...................................... 33

Input Data Referenced to REFCLK.......................................... 35

Optimizing the Data Input Timing.......................................... 36

Input Data RAM......................................................................... 37

Digital Datapath ............................................................................. 38

Interpolation Filters ................................................................... 38

Quadrature Modulator .............................................................. 40

Numerically Controlled Oscillator .......................................... 40

Inverse Sinc Filter ....................................................................... 40

Digital Amplitude and Offset Control .................................... 41

Digital Phase Correction........................................................... 41

Device Synchronization................................................................. 42

Synchronization Logic Overview............................................. 42

Synchronizing Devices to a System Clock .............................. 44

Synchronizing Multiple Devices to Each Other..................... 45

Interrupt Request Operation .................................................... 46

Driving the REFCLK Input ........................................................... 47

DAC REFCLK Configuration................................................... 47

Analog Outputs............................................................................... 50

Digital Amplitude Scaling......................................................... 50

Power Dissipation........................................................................... 52

AD9785/AD9787/AD9788 Evaluation Boards........................... 54

Output Configuration................................................................ 54

Digital Picture of Evaluation Board......................................... 54

Evaluation Board Software........................................................ 55

Evaluation Board Schematics ................................................... 56

Outline Dimensions ....................................................................... 62

Ordering Guide .......................................................................... 62

REVISION HISTORY

1/08—Revision 0: Initial Version

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