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AD9684

Data Sheet

Rev. 0 | Page 2 of 64

TABLE OF CONTENTS

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

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

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

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

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

Product Highlights ........................................................................... 3

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

DC Specifications ......................................................................... 4

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

Digital Specifications ................................................................... 6

Switching Specifications .............................................................. 7

Timing Specifications .................................................................. 8

Absolute Maximum Ratings.......................................................... 16

Thermal Characteristics ............................................................ 16

ESD Caution................................................................................ 16

Pin Configuration and Function Descriptions........................... 17

Typical Performance Characteristics ........................................... 19

Equivalent Circuits......................................................................... 22

Theory of Operation ...................................................................... 24

ADC Architecture ...................................................................... 24

Analog Input Considerations.................................................... 24

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

Clock Input Considerations...................................................... 27

Power-Down/Standby Mode..................................................... 28

Temperature Diode .................................................................... 28

ADC Overrange and Fast Detect.................................................. 29

ADC Overrange.......................................................................... 29

Fast Threshold Detection (FD_A and FD_B) ........................ 29

Signal Monitor ................................................................................ 30

Digital Downconverters (DDCs).................................................. 31

DDC I/Q Input Selection .......................................................... 31

DDC I/Q Output Selection ....................................................... 31

DDC General Description ........................................................ 31

Frequency Translation ................................................................... 37

General Description................................................................... 37

DDC NCO Plus Mixer Loss and SFDR................................... 38

Numerically Controlled Oscillator .......................................... 38

FIR Filters ........................................................................................ 40

General Description................................................................... 40

Half-Band Filters ........................................................................ 41

DDC Gain Stage ......................................................................... 42

DDC Complex to Real Conversion Block............................... 42

DDC Example Configurations ................................................. 43

Digital Outputs ............................................................................... 47

Digital Outputs ........................................................................... 47

ADC Overrange.......................................................................... 47

Multichip Synchronization............................................................ 48

SYNC± Setup and Hold Window Monitor............................. 49

Test Modes....................................................................................... 51

ADC Test Modes ........................................................................ 51

Serial Port Interface (SPI).............................................................. 52

Configuration Using the SPI..................................................... 52

Hardware Interface..................................................................... 52

SPI Accessible Features.............................................................. 52

Memory Map .................................................................................. 53

Reading the Memory Map Register Table............................... 53

Memory Map Register Table..................................................... 54

Applications Information .............................................................. 63

Power Supply Recommendations............................................. 63

Outline Dimensions....................................................................... 64

Ordering Guide .......................................................................... 64

REVISION HISTORY

4/15—Revision 0: Initial Version

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