AD9121 datasheet(3/61 Pages) AD

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AD9121

Data Sheet

Rev. B | Page 2 of 60

TABLE OF CONTENTS

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

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

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

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

Companion Products.................................................................1

Typical Signal Chain..................................................................1

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

Functional Block Diagram.........................................................4

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

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

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

Digital Input Data Timing Specifications...............................6

AC Specifications...................................................................7

Absolute Maximum Ratings ......................................................8

Thermal Resistance................................................................8

ESD Caution..........................................................................8

Pin Configuration and Function Descriptions...........................9

Typical Performance Characteristics .......................................11

Terminology ............................................................................17

Theory of Operation................................................................18

Serial Port Operation...........................................................18

Data Format.........................................................................18

Serial Port Pin Descriptions.................................................18

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

Device Configuration Register Map and Descriptions.........20

LVDS Input Data Ports............................................................31

Word Interface Mode...........................................................31

Byte Interface Mode.............................................................31

Interface Timing..................................................................31

Recommended Frame Input Bias Circuitry .........................32

FIFO Operation ...................................................................32

Digital Datapath ......................................................................36

Premodulation.....................................................................36

Interpolation Filters.............................................................36

NCO Modulation.................................................................39

Datapath Configuration.......................................................39

Determining Interpolation Filter Modes..............................40

Datapath Configuration Examples.......................................41

Data Rates vs. Interpolation Modes .....................................42

Coarse Modulation Mixing Sequences ................................42

Quadrature Phase Correction..............................................43

DC Offset Correction..........................................................43

Inverse Sinc Filter ................................................................43

DAC Input Clock Configurations............................................44

Driving the DACCLK and REFCLK Inputs.........................44

Direct Clocking...................................................................44

Clock Multiplication............................................................44

PLL Settings.........................................................................45

Configuring the VCO Tuning Band.....................................45

Analog Outputs.......................................................................46

Transmit DAC Operation....................................................46

Auxiliary DAC Operation....................................................47

Interfacing to Modulators....................................................48

Baseband Filter Implementation..........................................48

Driving the ADL5375-15.....................................................48

Reducing LO Leakage and Unwanted Sidebands.................49

Device Power Management.....................................................50

Power Dissipation................................................................50

Temperature Sensor.............................................................51

Multichip Synchronization......................................................52

Synchronization with Clock Multiplication ............................52

Synchronization with Direct Clocking.................................53

Data Rate Mode Synchronization........................................53

FIFO Rate Mode Synchronization .......................................54

Additional Synchronization Features...................................55

Interrupt Request Operation...................................................56

Interrupt Service Routine....................................................56

Interface Timing Validation ....................................................57

SED Operation ....................................................................57

SED Example.......................................................................58

Example Start-Up Routine.......................................................59

Device Configuration ..........................................................59

Derived PLL Settings...........................................................59

Derived NCO Settings.........................................................59

Start-Up Sequence...............................................................59

Outline Dimensions ................................................................60

Ordering Guide ...................................................................60

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