10-Bit, 210 MSPS TxDAC Digital-to-Analog Converter AD9740W FEATURES FUNCTIONAL BLOCK DIAGRAM 3.3V High performance member of pin-compatible TxDAC product family REFLO AVDD ACOM 150pF Excellent spurious-free dynamic range performance 1.2V REF AD9740W 0.1F SNR at 5 MHz output, 125 MSPS: 65 dB REFIO CURRENT SOURCE FS ADJ Twos complement or straight binary data format ARRAY R Differential current outputs: 2 mA to 20 mA SET 3.3V DVDD IOUTA LSB SEGMENTED IOUTB Power dissipation: 135 mW at 3.3 V DCOM SWITCHES SWITCHES Power-down mode: 15 mW at 3.3 V CLOCK CLOCK LATCHES MODE On-chip 1.2 V reference CMOS-compatible digital interface DIGITAL DATA INPUTS (DB9 TO DB0) 28-lead TSSOP package SLEEP Edge-triggered latches Figure 1. Qualified for automotive applications APPLICATIONS Wideband communication transmit channel Direct IF Base stations Wireless local loops Digital radio links Direct digital synthesis (DDS) Instrumentation GENERAL DESCRIPTION 1 The AD9740W is a 10-bit resolution, wideband, third Edge-triggered input latches and a 1.2 V temperature-compensated generation member of the TxDAC series of high performance, band gap reference have been integrated to provide a complete low power CMOS digital-to-analog converters (DACs). The monolithic DAC solution. The digital inputs support 3 V CMOS TxDAC family, consisting of pin-compatible 8-, 10-, 12-, and logic families. 14-bit DACs, is specifically optimized for the transmit signal PRODUCT HIGHLIGHTS path of communication systems. All of the devices share the 1. The AD9740W is the 10-bit member of the pin-compatible same interface options, small outline package, and pinout, TxDAC family, which offers excellent INL and DNL providing an upward or downward component selection path performance. based on performance, resolution, and cost. The AD9740W 2. Data input supports twos complement or straight binary offers exceptional ac and dc performance while supporting data coding. update rates up to 210 MSPS. 3. High speed, single-ended CMOS clock input supports The AD9740Ws low power dissipation makes it well suited for 210 MSPS conversion rate. portable and low power applications. Its power dissipation can 4. Low power: Complete CMOS DAC function operates on be further reduced to 60 mW with a slight degradation in 135 mW from a 2.7 V to 3.6 V single supply. The DAC full- performance by lowering the full-scale current output. In scale current can be reduced for lower power operation, addition, a power-down mode reduces the standby power and a sleep mode is provided for low power idle periods. dissipation to approximately 15 mW. A segmented current 5. On-chip voltage reference: The AD9740W includes a 1.2 V source architecture is combined with a proprietary switching temperature-compensated band gap voltage reference. technique to reduce spurious components and enhance 6. Industry-standard 28-lead TSSOP package. dynamic performance. 1 Protected by U.S. Patent Numbers 5568145, 5689257, and 5703519. Rev. 0 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. 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Trademarks and registered trademarks are the property of their respective owners. 09489-001AD9740W TABLE OF CONTENTS Features .............................................................................................. 1 Reference Control Amplifier .................................................... 13 Applications....................................................................................... 1 DAC Transfer Function ............................................................. 13 Functional Block Diagram .............................................................. 1 Analog Outputs .......................................................................... 13 General Description ......................................................................... 1 Digital Inputs .............................................................................. 14 Product Highlights ........................................................................... 1 Clock Input.................................................................................. 14 Revision History ............................................................................... 2 DAC Timing................................................................................ 14 Specifications..................................................................................... 3 Power Dissipation....................................................................... 15 DC Specifications ......................................................................... 3 Applying the AD9740W............................................................ 15 Dynamic Specifications ............................................................... 4 Differential Coupling Using a Transformer............................... 15 Digital Specifications ................................................................... 5 Differential Coupling Using an Op Amp................................ 15 Absolute Maximum Ratings............................................................ 6 Single-Ended, Unbuffered Voltage Output............................. 16 Thermal Characteristics .............................................................. 6 Single-Ended, Buffered Voltage Output Configuration........ 16 ESD Caution.................................................................................. 6 Power and Grounding Considerations, Power Supply Rejection...................................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 Outline Dimensions....................................................................... 18 Terminology ...................................................................................... 8 Ordering Guide .......................................................................... 18 Typical Performance Characteristics ............................................. 9 Automotive Products................................................................. 18 Functional Description .................................................................. 12 Reference Operation .................................................................. 12 REVISION HISTORY 12/10Revision 0: Initial Version Rev. 0 Page 2 of 20