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AD9764-EB Datasheet(PDF) 1 Page - Analog Devices |
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AD9764-EB Datasheet(HTML) 1 Page - Analog Devices |
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1 / 22 page  REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its 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 otherwise under any patent or patent rights of Analog Devices. a AD9764 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 14-Bit, 125 MSPS TxDAC® D/A Converter FUNCTIONAL BLOCK DIAGRAM FEATURES Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 14-Bit Resolution Excellent SFDR and IMD Differential Current Outputs: 2 mA to 20 mA Power Dissipation: 190 mW @ 5 V to 45 mW @ 3 V Power-Down Mode: 25 mW @ 5 V On-Chip 1.20 V Reference Single +5 V or +3 V Supply Operation Packages: 28-Lead SOIC and TSSOP Edge-Triggered Latches APPLICATIONS Communication Transmit Channel: Basestations ADSL/HFC Modems Instrumentation PRODUCT DESCRIPTION The AD9764 is the 14-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, is specifically opti- mized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, providing an upward or downward compo- nent selection path based on performance, resolution and cost. The AD9764 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS. The AD9764’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 a mere 45 mW with a slight degradation in performance by lowering the full-scale current output. Also, a power-down mode reduces the standby power dissipation to approximately 25 mW. The AD9764 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 1.2 V temperature compensated bandgap refer- ence have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families. The AD9764 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 k Ω output impedance. TxDAC is a registered trademark of Analog Devices, Inc. Differential current outputs are provided to support single- ended or differential applications. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The current outputs may be tied directly to an output resistor to provide two complemen- tary, single-ended voltage outputs or fed directly into a trans- former. The output voltage compliance range is 1.25 V. The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD9764 can be driven by the on-chip reference or by a variety of external reference voltages. The internal control amplifier, which provides a wide (>10:1) adjustment span, allows the AD9764 full-scale current to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9764 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities. The AD9764 is available in 28-lead SOIC and TSSOP packages. It is specified for operation over the industrial temperature range. PRODUCT HIGHLIGHTS 1. The AD9764 is a member of the TxDAC product family that provides an upward or downward component selection path based on resolution (8 to 14 bits), performance and cost. 2. Manufactured on a CMOS process, the AD9764 uses a pro- prietary switching technique that enhances dynamic perfor- mance beyond that previously attainable by higher power/cost bipolar or BiCMOS devices. 3. On-chip, edge-triggered input CMOS latches readily interface to +3 V and +5 V CMOS logic families. The AD9764 can support update rates up to 125 MSPS. 4. A flexible single-supply operating range of 2.7 V to 5.5 V, and 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- ured for various single-ended or differential circuit topologies. 50pF COMP1 +1.20V REF AVDD ACOM REFLO COMP2 CURRENT SOURCE ARRAY 0.1 F +5V SEGMENTED SWITCHES LSB SWITCHES REFIO FS ADJ DVDD DCOM CLOCK +5V RSET 0.1 F CLOCK IOUTA IOUTB 0.1 F LATCHES AD9764 SLEEP DIGITAL DATA INPUTS (DB13–DB0) |
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