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AD9708:  8-Bit, 100 MSPS+ TxDAC® D/A Converter

Product Details


The AD9708 is the 8-bit resolution member of the TxDAC™ series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC™ family, which consists of pin compatible 8-, 10-, 12-, and 14-bit DACs, was specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. The AD9708 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.

The AD9708's flexible single-supply operating range of 2.7 V to 5.5 V and low power dissipation are well suited for portable and low power applications. Its power dissipation can be further reduced to 45 mW, without a significant degradation in performance, by lowering the full-scale current output. In addition, a power-down mode reduces the standby power dissipation to approximately 20 mW.

The AD9708 is manufactured on an advanced CMOS process. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Edge-triggered input latches and a temperature compensated bandgap reference have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families.

The AD9708 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 k Ohms output impedance.

Differential current outputs are provided to support single-ended or differential applications. The current outputs may be directly tied to an output resistor to provide two complementary, single-ended voltage outputs. The output voltage compliance range is 1.25 V.

The AD9708 contains a 1.2 V on-chip reference and reference control amplifier, which allows the full-scale output current to be simply set by a single resistor. The AD9708 can be driven by a variety of external reference voltages. The AD9708's full-scale current can be adjusted over a 2 mA to 20 mA range without any degradation in dynamic performance. Thus, the AD9708 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities.

The AD9708 is available in a 28-pin SOIC package. It is specified for operation over the industrial temperature range.

FEATURES and BENEFITS

  • Member of Pin-Compatible TxDAC Product Family
  • 125 MSPS Update Rate
  • 8-Bit Resolution
  • Linearity:
    1/4 LSB DNL
    1/4 LSB INL
  • Differential Current Outputs
  • SINAD @ 5 MHz Output: 50 dB
  • Power Dissipation: 175 mW @ 5 V to 45 mW @ 3 V
  • See data sheet for addtional features

Functional Block Diagram for AD9708

For evaluation of all Analog Devices High Speed DAC components you will need to purchase or loan a Data Pattern Generator. To find out more information please click here.

Documentation

Title Content Type File Type
AD9708: 8-Bit, 100 MSPS+ TxDAC® D/A Converter Data Sheet  (Rev B, 04/1999) (pdf, 246 kB) Data Sheets PDF
AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC  (pdf, 246 kB) Application Notes PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
AN-342: Analog Signal-Handling for High Speed and Accuracy.  (pdf, 468 kB)
Signal handling techniques for optimizing DAC and ADC performance.
Application Notes PDF
AN-237: Choosing DACs for Direct Digital Synthesis  (pdf, 1156 kB) Application Notes PDF
AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters  (pdf, 36 kB) Application Notes PDF
AN-420: 0: Using the AD9708/AD9760/AD9701/AD9764-EB Evaluation Board  (pdf, 227 kB) Application Notes PDF
AN-302: 02: Exploit Digital Advantages in an SSB Receiver  (pdf, 417 kB) Application Notes PDF
Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
DAC Harmonic Analyzer
This tool displays harmonic images and spurs in a DAC output. The user can define a post-DAC analog filter to suppress these images. The effect of this filter is plotted on the graph and shown in the accompanying chart.
DAC Harmonic Analyzer HTML
AD9708 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD9708 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9708AR Status: Production 28 ld SOIC - Wide 28 Ind Tube, 27 $4.34 $3.69 N  Material Info PCN Purchase
AD9708ARU Status: Production 28 ld TSSOP 28 Ind Tube, 50 $4.34 $3.69 N  Material Info PCN Purchase
AD9708ARURL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $3.69 N  Material Info PCN Purchase
AD9708ARUZ Status: Production 28 ld TSSOP 28 Ind Tube, 50 $3.75 $3.19 Y  Material Info PCN Purchase Sample
AD9708ARUZRL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $3.19 Y  Material Info PCN Purchase
AD9708ARZ Status: Production 28 ld SOIC - Wide 28 Ind Tube, 27 $3.75 $3.19 Y  Material Info PCN Purchase Sample
AD9708ARZRL Status: Production 28 ld SOIC - Wide 28 Ind Reel, 1000 - $3.19 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD9708 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9708-EBZ Status: Production Evaluation Board $303.60 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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