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AD9778-EB Datasheet(PDF) 1 Page - Analog Devices |
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AD9778-EB Datasheet(HTML) 1 Page - Analog Devices |
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1 / 56 page  Dual 12-/14-/16-Bit, 1 GSPS, Digital-to-Analog Converters AD9776/AD9778/AD9779 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005–2007 Analog Devices, Inc. All rights reserved. FEATURES Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS, full operating conditions SFDR = 78 dBc to fOUT = 100 MHz Single carrier WCDMA ACLR = 79 dBc @ 80 MHz IF Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth Auxiliary DACs allow control of external VGA and offset control Multiple chip synchronization interface High performance, low noise PLL clock multiplier Digital inverse sinc filter 100-lead, exposed paddle TQFP package APPLICATIONS Wireless infrastructure WCDMA, CDMA2000, TD-SCDMA, WiMax, GSM Digital high or low IF synthesis Internal digital upconversion capability Transmit diversity Wideband communications: LMDS/MMDS, point-to-point GENERAL DESCRIPTION The AD9776/AD9778/AD9779 are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that pro- vide a sample rate of 1 GSPS, permitting multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quad- rature modulators such as the AD8349. A serial peripheral interface (SPI®) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in 100-lead TQFP packages. PRODUCT HIGHLIGHTS 1. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies. 2. A proprietary DAC output switching technique enhances dynamic performance. 3. The current outputs are easily configured for various single-ended or differential circuit topologies. 4. CMOS data input interface with adjustable set up and hold. 5. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth. TYPICAL SIGNAL CHAIN FPGA/ASIC/DSP DC COMPLEX I AND Q DC LO QUADRATURE MODULATOR/ MIXER/ AMPLIFIER I DAC Q DAC DIGITAL INTERPOLATION FILTERS AD9779 POST DAC ANALOG FILTER A Figure 1. |
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