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AD9709

8-Bit, 125 MSPS, Dual TxDAC+ Digital-to-Analog Converter

Analog Devices 

AD9709

TABLE OF CONTENTS

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

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

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

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

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

Revision History ............................................................................... 2

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

DC Specifications ......................................................................... 3

Dynamic Specifications ............................................................... 4

Digital Specifications ................................................................... 5

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Terminology .................................................................................... 11

Theory of Operation ...................................................................... 12

Functional Description.............................................................. 12

Reference Operation .................................................................. 13

Gain Control Mode .................................................................... 13

Setting the Full-Scale Current................................................... 13

DAC Transfer Function ............................................................. 14

REVISION HISTORY

9/09—Rev. A to Rev. B

Changes to Power and Grounding Considerations Section ..... 20

Changes to Schematics Section..................................................... 24

Changes to Evaluation Board Layout Section............................. 30

1/08—Rev. 0 to Rev. A

Updated Format..................................................................Universal

Changed Single Supply Operation to 5 V or 3.3 V ........Universal

Changes to Figure 1 .......................................................................... 1

Added Timing Diagram Section .................................................... 5

Changes to Figure 3 and Table 6..................................................... 7

Change to Figure 12 ......................................................................... 9

Changes to Figure 18 to Figure 20................................................ 10

Changes to Functional Description Section ............................... 13

Changes to Reference Operation Section.................................... 13

Changes to Figure 23 and Figure 24............................................. 13

Changes to Gain Control Mode Section...................................... 13

Analog Outputs .......................................................................... 14

Digital Inputs .............................................................................. 15

DAC Timing................................................................................ 15

Sleep Mode Operation ............................................................... 18

Power Dissipation....................................................................... 18

Applying the AD9709 .................................................................... 19

Output Configurations .............................................................. 19

Differential Coupling Using a Transformer............................ 19

Differential Coupling Using an Op Amp................................ 19

Single-Ended, Unbuffered Voltage Output............................. 20

Single-Ended, Buffered Voltage Output Configuration........ 20

Power and Grounding Considerations.................................... 20

Applications Information .............................................................. 22

Quadrature Amplitude Modulation (QAM) Using the

AD9709 ........................................................................................ 22

CDMA ......................................................................................... 23

Evaluation Board ............................................................................ 24

General Description................................................................... 24

Schematics ................................................................................... 24

Evaluation Board Layout ........................................................... 30

Outline Dimensions ....................................................................... 32

Ordering Guide .......................................................................... 32

Replaced Reference Control Amplifier Section with Setting

the Full-Scale Current Section...................................................... 13

Changes to DAC Transfer Function Section............................... 14

Changes to Interleaved Mode Timing Section ........................... 16

Added Figure 28 ............................................................................. 16

Changes to Power and Grounding Considerations Section ..... 20

Changes to Figure 44...................................................................... 22

Deleted Figure 43............................................................................ 17

Changes to CDMA Section ........................................................... 23

Changes to Figure 45 Caption ...................................................... 23

Changes to Figure 46...................................................................... 24

Changes to Figure 48...................................................................... 26

Updated Outline Dimensions ....................................................... 30

Changes to Ordering Guide .......................................................... 30

5/00—Revision 0: Initial Version

Rev. B | Page 2 of 32

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