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Fabricante

AD9865

Broadband Modem Mixed-Signal Front End

Analog Devices 

AD9865

TABLE OF CONTENTS

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

Tx Path Specifications.................................................................. 3

Rx Path Specifications.................................................................. 4

Power Supply Specifications ....................................................... 5

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

Serial Port Timing Specifications............................................... 7

Half-Duplex Data Interface (ADIO Port) Timing

Specifications ................................................................................ 7

Full-Duplex Data Interface (Tx and Rx Port) Timing

Specifications ................................................................................ 8

Explanation of Test Levels........................................................... 8

Absolute Maximum Ratings............................................................ 9

Thermal Characteristics .............................................................. 9

ESD Caution.................................................................................. 9

Pin Configuration and Function Descriptions........................... 10

Typical Performance Characteristics ........................................... 12

Rx Path Typical Performance Characteristics ........................ 12

TxDAC Path Typical Performance Characteristics ............... 16

IAMP Path Typical Performance Characteristics .................. 18

Serial Port ........................................................................................ 19

Register Map Description ......................................................... 21

Serial Port Interface (SPI) ......................................................... 21

Digital Interface .............................................................................. 23

Half-Duplex Mode ..................................................................... 23

Full-Duplex Mode ...................................................................... 24

RxPGA Control .......................................................................... 25

TxPGA Control .......................................................................... 27

Transmit Path .................................................................................. 28

Digital Interpolation Filters ...................................................... 28

REVISION HISTORY

11/04—Data Sheet Changed from Rev. 0 to Rev. A

Changes to Specifications Tables .................................................... 3

Changes to Serial Table .................................................................. 19

Changes to Full Duplex Mode section......................................... 24

Change to TxDAC and IAMP Architecture section .................. 29

TxDAC and IAMP Architecture .............................................. 28

Tx Programmable Gain Control .............................................. 30

TxDAC Output Operation........................................................ 30

IAMP Current-Mode Operation.............................................. 30

IAMP Voltage-Mode Operation .............................................. 31

IAMP Current Consumption Considerations........................ 32

Receive Path .................................................................................... 33

Rx Programmable Gain Amplifier........................................... 33

Low-Pass Filter ........................................................................... 34

Analog-to-Digital Converter (ADC)....................................... 35

AGC Timing Considerations.................................................... 36

Clock Synthesizer ........................................................................... 37

Power Control and Dissipation .................................................... 39

Power-Down ............................................................................... 39

Half-Duplex Power Savings ...................................................... 39

Power Reduction Options......................................................... 40

Power Dissipation ...................................................................... 42

Mode Select upon Power-Up and Reset.................................. 42

Analog and Digital Loop-Back Test Modes............................ 43

PCB Design Considerations.......................................................... 44

Component Placement.............................................................. 44

Power Planes and Decoupling .................................................. 44

Ground Planes ............................................................................ 44

Signal Routing ............................................................................ 44

Evaluation Board ............................................................................ 46

Outline Dimensions ....................................................................... 47

Ordering Guide .......................................................................... 47

Change to TxDAC Output Operation section............................ 30

Insert equation................................................................................ 37

Change to Figure 84 caption ......................................................... 42

11/03—Revision 0: Initial Version

Rev. A | Page 2 of 48

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