AD6679 datasheet(2/81 Pages) AD

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AD6679

Data Sheet

Rev. B | Page 2 of 81

TABLE OF CONTENTS

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

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

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

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

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

Product Highlights ........................................................................... 4

Specifications..................................................................................... 5

DC Specifications ......................................................................... 5

AC Specifications.......................................................................... 6

Digital Specifications ................................................................... 7

Switching Specifications .............................................................. 8

Timing Specifications .................................................................. 9

Absolute Maximum Ratings.......................................................... 18

Thermal Characteristics ............................................................ 18

ESD Caution................................................................................ 18

Pin Configurations and Function Descriptions ......................... 19

Typical Performance Characteristics ........................................... 25

Equivalent Circuits......................................................................... 28

Theory of Operation ...................................................................... 30

ADC Architecture ...................................................................... 30

Analog Input Considerations.................................................... 30

Voltage Reference ....................................................................... 32

Clock Input Considerations...................................................... 33

Power-Down/Standby Mode..................................................... 35

Temperature Diode .................................................................... 35

Virtual Converter Mapping........................................................... 36

ADC Overrange and Fast Detect.................................................. 38

ADC Overrange (OR)................................................................ 38

Fast Threshold Detection (FD_A and FD_B) ........................ 38

Signal Monitor ................................................................................ 39

Digital Downconverter (DDC)..................................................... 40

DDC I/Q Input Selection .......................................................... 40

DDC I/Q Output Selection ....................................................... 40

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

Frequency Translation ................................................................... 46

General Description................................................................... 46

DDC NCO Plus Mixer Loss and SFDR................................... 47

Numerically Controlled Oscillator .......................................... 47

FIR Filters ........................................................................................ 49

Overview ..................................................................................... 49

Half-Band Filters ........................................................................ 49

DDC Gain Stage ......................................................................... 51

DDC Complex to Real Conversion ......................................... 51

DDC Example Configurations ................................................. 52

Noise Shaping Requantizer (NSR) ............................................... 56

Decimating Half-Band Filter .................................................... 56

NSR Overview ............................................................................ 56

Variable Dynamic Range (VDR).................................................. 59

VDR Real Mode.......................................................................... 60

VDR Complex Mode ................................................................. 60

Digital Outputs ............................................................................... 62

Timing.......................................................................................... 62

Data Clock Output..................................................................... 62

ADC Overrange.......................................................................... 62

Multichip Synchronization............................................................ 64

SYNC± Setup and Hold Window Monitor............................. 65

Test Modes....................................................................................... 67

ADC Test Modes ........................................................................ 67

Serial Port Interface (SPI).............................................................. 68

Configuration Using the SPI..................................................... 68

Hardware Interface..................................................................... 68

SPI Accessible Features.............................................................. 68

Memory Map .................................................................................. 69

Reading the Memory Map Register Table............................... 69

Memory Map Register Table..................................................... 70

Applications Information .............................................................. 80

Power Supply Recommendations............................................. 80

Outline Dimensions....................................................................... 81

Ordering Guide .......................................................................... 81

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