10-Bit, 210 MSPS TxDAC D/A Converter AD9740 FEATURES APPLICATIONS High performance member of pin-compatible Wideband communication transmit channel TxDAC product family Direct IF Excellent spurious-free dynamic range performance Base stations SNR 5 MHz output, 125 MSPS: 65 dB Wireless local loops Twos complement or straight binary data format Digital radio links Differential current outputs: 2 mA to 20 mA Direct digital synthesis (DDS) Power dissipation: 135 mW 3.3 V Instrumentation Power-down mode: 15 mW 3.3 V FUNCTIONAL BLOCK DIAGRAM On-chip 1.2 V Reference 3.3V CMOS-compatible digital interface 28-lead SOIC, 28-lead TSSOP, and 32-lead LFCSP REFLO AVDD ACOM 150pF 1.2V REF packages 0.1 F AD9740 REFIO CURRENT Edge-triggered latches SOURCE FS ADJ ARRAY R SET 3.3V DVDD IOUTA SEGMENTED LSB DCOM IOUTB SWITCHES SWITCHES CLOCK MODE CLOCK LATCHES DIGITAL DATA INPUTS (DB9DB0) SLEEP Figure 1. GENERAL DESCRIPTION 1 The AD9740 is a 10-bit resolution, wideband, third generation Edge-triggered input latches and a 1.2 V temperature-compensated member of the TxDAC series of high performance, low power band gap reference have been integrated to provide a complete CMOS digital-to-analog converters (DACs). The TxDAC monolithic DAC solution. The digital inputs support 3 V CMOS family, consisting of pin-compatible 8-, 10-, 12-, and 14-bit logic families. DACs, is specifically optimized for the transmit signal path PRODUCT HIGHLIGHTS of communication systems. All of the devices share the same 1. The AD9740 is the 10-bit member of the pin-compatible interface options, small outline package, and pinout, providing TxDAC family, which offers excellent INL and DNL an upward or downward component selection path based performance. on performance, resolution, and cost. The AD9740 offers 2. Data input supports twos complement or straight binary exceptional ac and dc performance while supporting update data coding. rates up to 210 MSPS. 3. High speed, single-ended CMOS clock input supports 210 MSPS conversion rate. The AD9740s low power dissipation makes it well suited for 4. Low power: Complete CMOS DAC function operates on portable and low power applications. Its power dissipation 135 mW from a 2.7 V to 3.6 V single supply. The DAC full- can be further reduced to 60 mW with a slight degradation in scale current can be reduced for lower power operation, performance by lowering the full-scale current output. In and a sleep mode is provided for low power idle periods. addition, a power-down mode reduces the standby power 5. On-chip voltage reference: The AD9740 includes a 1.2 V dissipation to approximately 15 mW. A segmented current temperature-compensated band gap voltage reference. source architecture is combined with a proprietary switching 6. Industry-standard 28-lead SOIC, 28-lead TSSOP, and 32- technique to reduce spurious components and enhance lead LFCSP packages. dynamic performance. 1 Protected by U.S. Patent Numbers 5568145, 5689257, and 5703519. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02911-001AD9740 TABLE OF CONTENTS Features .............................................................................................. 1 DAC Transfer Function ............................................................. 14 Applications....................................................................................... 1 Analog Outputs .......................................................................... 14 Functional Block Diagram .............................................................. 1 Digital Inputs .............................................................................. 15 General Description ......................................................................... 1 Clock Input.................................................................................. 15 Product Highlights ........................................................................... 1 DAC Timing................................................................................ 16 Revision History ............................................................................... 3 Power Dissipation....................................................................... 16 Specifications..................................................................................... 4 Applying the AD9740 ................................................................ 17 DC Specifications ......................................................................... 4 Differential Coupling Using a Transformer............................... 17 Dynamic Specifications ............................................................... 5 Differential Coupling Using an Op Amp................................ 18 Digital Specifications ................................................................... 6 Single-Ended, Unbuffered Voltage Output............................. 18 Absolute Maximum Ratings............................................................ 7 Single-Ended, Buffered Voltage Output Configuration........ 18 Thermal Characteristics .............................................................. 7 Power and Grounding Considerations, Power Supply Rejection...................................................................................... 19 ESD Caution.................................................................................. 7 Evaluation Board ............................................................................ 20 Pin Configurations and Function Descriptions ........................... 8 General Description................................................................... 20 Terminology ...................................................................................... 9 Outline Dimensions ....................................................................... 30 Typical Performance Characteristics ........................................... 10 Ordering Guide .......................................................................... 31 Functional Description .................................................................. 13 Reference Operation .................................................................. 13 Reference Control Amplifier .................................................... 14 Rev. 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