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AD9748XCP Datasheet(PDF) 1 Page - Analog Devices |
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AD9748XCP Datasheet(HTML) 1 Page - Analog Devices |
1 / 7 page REV. PrA Preliminary Technical Data PRELIMINARY TECHNICAL DATA 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9748* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 8-Bit, 165 MSPS TxDAC® D/A Converter FUNCTIONAL BLOCK DIAGRAM FEATURES High-Performance Member of Pin-Compatible TxDAC Product Family Excellent Spurious-Free Dynamic Range and Noise Performance Two’s Complement or Straight Binary Data Format Differential Current Outputs: 2 mA to 20 mA Power Dissipation: 135 mW @ 3.3 V Power-Down Mode: 15 mW @ 3.3 V On-Chip 1.20 V Reference CMOS-Compatible Digital Interface Package: 32-Lead Leadframe Chip Scale Package (LFCSP) Edge-Triggered Latches APPLICATIONS Wideband Communication Transmit Channel: Direct IF Base Stations Wireless Local Loop Digital Radio Link Direct Digital Synthesis (DDS) Instrumentation 150pF +1.20V REF AVDD ACOM CURRENT SOURCE ARRAY 3.3V SEGMENTED SWITCHES LSB SWITCHES REFIO FS ADJ DVDD DCOM 3.3V RSET 0.1 F CLK+ IOUTA IOUTB LATCHES AD9748 SLEEP DIGITAL DATA INPUTS (DB7-DB0) MODE1 MODE2 CLK- CLKVDD CLKCOM 3.3V PRODUCT DESCRIPTION The AD9748 is a 8-bit resolution, wideband, third generation member of the TxDAC series of high-performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, consisting of pin-compatible 8-, 10-, 12-, and 14-bit DACs, is specifically optimized for the transmit signal path of communica- tion systems. All of the devices share the same interface options, small outline package, and pinout, providing an upward or down- ward component selection path based on performance, resolution, and cost. The AD9748 offers exceptional ac and dc performance while supporting update rates up to 165 MSPS. The AD9748’s low power dissipation makes it well suited for portable and low power applications. Its power dissipation can be further reduced to a mere 60 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 15 mW. 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 band gap reference have been integrated to provide a complete monolithic DAC solution. The digital inputs support 3 V CMOS logic families. PRODUCT HIGHLIGHTS 1. New 32-lead LFCSP package. 2. The AD9748 is the 8-bit member of the pin-compatible TxDAC family that offers excellent INL and DNL performance. 3. Differential or single-ended clock input (LVPECL or CMOS). 4. Data input supports two’s complement or straight binary data coding. 5. High-speed, single-ended CMOS clock input supports 165 MSPS conversion rate. 6. Low power: Complete CMOS DAC function operates on 135 mW from a 3.0 V to 3.6 V single supply. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for low power idle periods. 7. On-chip voltage reference: The AD9748 includes a 1.2 V temperature-compensated band gap voltage reference. TxDAC is a registered trademark of Analog Devices, Inc. *Protected by U.S. Patent Numbers 5568145, 5689257, and 5703519. |
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