14-Bit, 125 MSPS a TxDAC D/A Converter AD9764 FUNCTIONAL BLOCK DIAGRAM FEATURES Member of Pin-Compatible TxDAC Product Family +5V 125 MSPS Update Rate 0.1mF 14-Bit Resolution Excellent SFDR and IMD REFLO COMP1 AVDD ACOM Differential Current Outputs: 2 mA to 20 mA +1.20V REF AD9764 50pF 0.1mF Power Dissipation: 190 mW 5 V to 45 mW 3 V REFIO 0.1mF CURRENT COMP2 Power-Down Mode: 25 mW 5 V FS ADJ SOURCE ARRAY On-Chip 1.20 V Reference R SET Single +5 V or +3 V Supply Operation +5V DVDD I OUTA Packages: 28-Lead SOIC and TSSOP SEGMENTED LSB I DCOM OUTB SWITCHES SWITCHES Edge-Triggered Latches CLOCK CLOCK LATCHES APPLICATIONS SLEEP Communication Transmit Channel: DIGITAL DATA INPUTS (DB13DB0) Basestations ADSL/HFC Modems Differential current outputs are provided to support single- Instrumentation ended or differential applications. Matching between the two current outputs ensures enhanced dynamic performance in a PRODUCT DESCRIPTION differential output configuration. The current outputs may be The AD9764 is the 14-bit resolution member of the TxDAC tied directly to an output resistor to provide two complemen- series of high performance, low power CMOS digital-to-analog tary, single-ended voltage outputs or fed directly into a trans- converters (DACs). The TxDAC family, which consists of pin former. The output voltage compliance range is 1.25 V. compatible 8-, 10-, 12-, and 14-bit DACs, is specifically opti- mized for the transmit signal path of communication systems. The on-chip reference and control amplifier are configured for All of the devices share the same interface options, small outline maximum accuracy and flexibility. The AD9764 can be driven package and pinout, providing an upward or downward compo- by the on-chip reference or by a variety of external reference nent selection path based on performance, resolution and cost. voltages. The internal control amplifier, which provides a wide The AD9764 offers exceptional ac and dc performance while (>10:1) adjustment span, allows the AD9764 full-scale current supporting update rates up to 125 MSPS. to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9764 may operate The AD9764s flexible single-supply operating range of 2.7 V to at reduced power levels or be adjusted over a 20 dB range to 5.5 V and low power dissipation are well suited for portable and provide additional gain ranging capabilities. low power applications. Its power dissipation can be further reduced to a mere 45 mW with a slight degradation in performance The AD9764 is available in 28-lead SOIC and TSSOP packages. by lowering the full-scale current output. Also, a power-down It is specified for operation over the industrial temperature range. mode reduces the standby power dissipation to approximately PRODUCT HIGHLIGHTS 25 mW. 1. The AD9764 is a member of the TxDAC product family that The AD9764 is manufactured on an advanced CMOS process. provides an upward or downward component selection path A segmented current source architecture is combined with a based on resolution (8 to 14 bits), performance and cost. proprietary switching technique to reduce spurious components 2. Manufactured on a CMOS process, the AD9764 uses a pro- and enhance dynamic performance. Edge-triggered input prietary switching technique that enhances dynamic perfor- latches and a 1.2 V temperature compensated bandgap refer- mance beyond that previously attainable by higher power/cost ence have been integrated to provide a complete monolithic bipolar or BiCMOS devices. DAC solution. Flexible supply options support +3 V and +5 V 3. On-chip, edge-triggered input CMOS latches readily interface CMOS logic families. to +3 V and +5 V CMOS logic families. The AD9764 can The AD9764 is a current-output DAC with a nominal full-scale support update rates up to 125 MSPS. output current of 20 mA and > 100 kW output impedance. 4. A flexible single-supply operating range of 2.7 V to 5.5 V, and TxDAC is a registered trademark of Analog Devices, Inc. a wide full-scale current adjustment span of 2 mA to 20 mA, allows the AD9764 to operate at reduced power levels. 5. The current output(s) of the AD9764 can be easily config- REV. C ured for various single-ended or differential circuit topologies. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or Tel:781/329-4700 World Wide Web Site: AD9764* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS REFERENCE MATERIALS View a parametric search of comparable parts. Informational Advantiv Advanced TV Solutions EVALUATION KITS Solutions Bulletins & Brochures AD9764 Evaluation Board Digital to Analog Converters ICs Solutions Bulletin DOCUMENTATION DESIGN RESOURCES Application Notes AD9764 Material Declaration AN-237: Choosing DACs for Direct Digital Synthesis PCN-PDN Information AN-302: Exploit Digital Advantages in an SSB Receiver Quality And Reliability AN-320A: CMOS Multiplying DACs and Op Amps Combine Symbols and Footprints to Build Programmable Gain Amplifier, Part 1 AN-420: Using the AD9708/AD9760/AD9701/AD9764-EB DISCUSSIONS Evaluation Board View all AD9764 EngineerZone Discussions. AN-595: Understanding Pin Compatibility in the TxDAC Line of High Speed D/A Converters SAMPLE AND BUY AN-912: Driving a Center-Tapped Transformer with a Visit the product page to see pricing options. Balanced Current-Output DAC Data Sheet TECHNICAL SUPPORT AD9764: 14-Bit, 125 MSPS TxDAC D/A Converter Data Submit a technical question or find your regional support Sheet number. DOCUMENT FEEDBACK Submit feedback for this data sheet. This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.