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AD9121 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9121 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 61 page Dual, 14-Bit, 1230 MSPS, TxDAC+ Digital-to-Analog Converter Data Sheet AD9121 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor foranyinfringementsofpatentsorother rights of third parties that may result from its use. Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks arethe propertyoftheir respectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Flexible LVDS interface allows word or byte load Single-carrier W-CDMA ACLR = 82 dBc at 122.88 MHz IF Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω Integrated 2×/4×/8× interpolator/complexmodulatorallows carrier placement anywhere in the DAC bandwidth Gain, dc offset, and phase adjustment for sideband suppression Multiple chip synchronization interfaces High performance, lownoise PLL clock multiplier Digital inverse sinc filter Lowpower: 1.5 W at 1.2 GSPS, 800 mW at 500 MSPS, full operating conditions 72-lead, exposed paddle LFCSP APPLICATIONS Wireless infrastructure W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM, LTE Digital high or low IF synthesis Transmit diversity Wideband communications: LMDS/MMDS, point-to-point GENERAL DESCRIPTION The AD9121 is a dual, 14-bit, high dynamic range digital-to- analog converter (DAC) that provides a sample rate of 1230 MSPS, permitting multicarrier generation up to the Nyquist frequency. The AD9121 TxDAC+® includes features optimized for direct conversion transmit applications, including complex digital mod- ulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators, such as the ADL537x F-MOD series from Analog Devices, Inc. A 4-wire serial port interface provides for program- ming/readback of many internal parameters. Full-scale output current can be programmed over a range of 8.7 mA to 31.7 mA. The AD9121 comes in a 72-lead LFCSP. PRODUCT HIGHLIGHTS 1. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies (IF). 2. Proprietary DAC output switching technique enhances dynamic performance. 3. Current outputs are easily configured for various single- ended or differential circuit topologies. 4. Flexible LVDS digital interface allows the standard 28-wire bus to be reduced to one-half of the width. COMPANION PRODUCTS IQ Modulators: ADL5370, ADL537x family IQ Modulatorswith PLLand VCO: ADRF6701, ADRF670x family Clock Drivers: AD9516, AD951x family Voltage Regulator Design Tool: ADIsimPower TYPICAL SIGNAL CHAIN NOTES 1. AQM = ANALOG QUADRATURE MODULATOR. COMPLEX BASEBAND DC COMPLEX IF fIF RF LO – fIF DIGITAL BASEBAND PROCESSOR PA I DAC Q DAC 2 2 2/4 2/4 ANTIALIASING FILTER AQM LO SIN COS AD9121 Figure 1. |
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