AD6655 Просмотр технического описания (PDF) - Analog Devices

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AD6655

IF Diversity Receiver

Analog Devices 

AD6655

TABLE OF CONTENTS

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

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

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

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

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

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

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

ADC DC Specifications—AD6655BCPZ-80/

AD6655BCPZ-105......................................................................... 5

ADC DC Specifications—AD6655BCPZ-125/

AD6655BCPZ-150......................................................................... 6

ADC AC Specifications—AD6655BCPZ-80/

AD6655BCPZ-105......................................................................... 7

ADC AC Specifications—AD6655BCPZ-125/

AD6655BCPZ-150......................................................................... 8

Digital Specifications—AD6655BCPZ-80/

AD6655BCPZ-105......................................................................... 9

Digital Specifications—AD6655BCPZ-125/

AD6655BCPZ-150....................................................................... 11

Switching Specifications—AD6655BCPZ-80/

AD6655BCPZ-105....................................................................... 13

Switching Specifications—AD6655BCPZ-125/

AD6655BCPZ-150....................................................................... 14

Timing Specifications ................................................................ 15

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

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

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

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

Equivalent Circuits ......................................................................... 23

Typical Performance Characteristics ........................................... 24

Theory of Operation ...................................................................... 29

ADC Architecture ...................................................................... 29

Analog Input Considerations.................................................... 29

Voltage Reference ....................................................................... 31

Clock Input Considerations ...................................................... 32

Power Dissipation and Standby Mode..................................... 34

Digital Outputs ........................................................................... 35

Digital Downconverter .................................................................. 37

Downconverter Modes .............................................................. 37

Numerically Controlled Oscillator (NCO) ............................. 37

Half-Band Decimating Filter and FIR Filter........................... 37

fADC/8 Fixed-Frequency NCO ................................................... 37

Numerically Controlled Oscillator (NCO) ................................. 38

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

NCO Synchronization ............................................................... 38

Phase Offset................................................................................. 38

NCO Amplitude and Phase Dither.......................................... 38

Decimating Half-Band Filter and FIR filter................................ 39

Half-Band Filter Coefficients.................................................... 39

Half-Band Filter Features .......................................................... 39

Fixed-Coefficient FIR Filter...................................................... 39

Synchronization.......................................................................... 40

Combined Filter Performance.................................................. 40

Final NCO ................................................................................... 40

ADC Overrange and Gain Control.............................................. 41

Fast Detect Overview................................................................. 41

ADC Fast Magnitude ................................................................. 41

ADC Overrange (OR)................................................................ 42

Gain Switching............................................................................ 42

Signal Monitor ................................................................................ 44

Peak Detector Mode................................................................... 44

RMS/MS Magnitude Mode....................................................... 44

Threshold Crossing Mode......................................................... 45

Additional Control Bits ............................................................. 45

DC Correction ............................................................................ 45

Signal Monitor SPORT Output ................................................ 46

Channel/Chip Synchronization.................................................... 47

Serial Port Interface (SPI).............................................................. 48

Configuration Using the SPI..................................................... 48

Hardware Interface..................................................................... 48

Configuration Without the SPI ................................................ 49

SPI Accessible Features.............................................................. 49

Memory Map .................................................................................. 50

Reading the Memory Map Register Table............................... 50

Memory Map Register Table..................................................... 51

Memory Map Register Description ......................................... 55

Applications Information .............................................................. 59

Design Guidelines ...................................................................... 59

Evaluation Board ............................................................................ 61

Power Supplies ............................................................................ 61

Rev. 0 | Page 2 of 84

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