AD6684 datasheet(2/107 Pages) AD

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AD6684

Data Sheet

Rev. 0 | Page 2 of 107

TABLE OF CONTENTS

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

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

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

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

General Description ......................................................................... 4

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

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

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

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

Digital Specifications ................................................................... 8

Switching Specifications .............................................................. 9

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

Absolute Maximum Ratings.......................................................... 11

Thermal Characteristics ............................................................ 11

ESD Caution................................................................................ 11

Pin Configuration and Function Descriptions........................... 12

Typical Performance Characteristics ........................................... 14

Equivalent Circuits ......................................................................... 21

Theory of Operation ...................................................................... 23

ADC Architecture ...................................................................... 23

Analog Input Considerations.................................................... 23

Voltage Reference ....................................................................... 25

Clock Input Considerations ...................................................... 26

Temperature Diode .................................................................... 27

ADC Overrange and Fast Detect.................................................. 28

ADC Overrange.......................................................................... 28

Fast Threshold Detection (FD_A, FD_B, FD_C and FD_D).... 28

Signal Monitor ................................................................................ 29

SPORT Over JESD204B............................................................. 29

Digital Downconverter (DDC)..................................................... 32

DDC I/Q Input Selection .......................................................... 32

DDC I/Q Output Selection ....................................................... 32

DDC General Description ........................................................ 32

Frequency Translation ................................................................... 38

General Description................................................................... 38

DDC NCO + Mixer Loss and SFDR........................................ 39

Numerically Controlled Oscillator........................................... 39

FIR Filters ........................................................................................ 41

General Description................................................................... 41

Half-Band Filters ........................................................................ 42

DDC Gain Stage ......................................................................... 44

DDC Complex to Real Conversion ......................................... 44

DDC Example Configurations ................................................. 45

Noise Shaping Requantizer (NSR) ............................................... 49

Decimating Half-Band Filter .................................................... 49

NSR Overview ............................................................................ 50

Variable Dynamic Range (VDR) .................................................. 51

VDR Real Mode.......................................................................... 52

VDR Complex Mode ................................................................. 52

Digital Outputs ............................................................................... 54

Introduction to the JESD204B Interface ................................. 54

JESD204B Overview .................................................................. 54

Functional Overview ................................................................. 56

JESD204B Link Establishment ................................................. 56

Physical Layer (Driver) Outputs .............................................. 57

JESD204B Tx Converter Mapping ........................................... 59

Setting Up the AD6684 Digital Interface ................................ 60

Latency............................................................................................. 64

End-To-End Total Latency........................................................ 64

Multichip Synchronization............................................................ 65

SYSREF± Setup/Hold Window Monitor................................. 67

Test Modes....................................................................................... 69

ADC Test Modes ........................................................................ 69

JESD204B Block Test Modes .................................................... 70

Serial Port Interface........................................................................ 72

Configuration Using the SPI..................................................... 72

Hardware Interface..................................................................... 72

SPI Accessible Features.............................................................. 72

Memory Map .................................................................................. 73

Reading the Memory Map Register Table............................... 73

Memory Map .................................................................................. 74

Memory Map Summary ............................................................ 74

Memory Map Details ................................................................. 82

Applications Information ............................................................ 106

Power Supply Recommendations........................................... 106

Exposed Pad Thermal Heat Slug Recommendations.......... 106

AVDD1_SR (Pin 64) and AGND_SR (Pin 63 and Pin 67). 106

Outline Dimensions ..................................................................... 107

Ordering Guide ........................................................................ 107

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