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AD9858FDPCB Datasheet(PDF) 1 Page - Analog Devices |
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AD9858FDPCB Datasheet(HTML) 1 Page - Analog Devices |
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1 / 32 page  1 GSPS Direct Digital Synthesizer AD9858 Rev. A 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2003 Analog Devices, Inc. All rights reserved. FEATURES 1 GSPS internal clock speed Up to 2 GHz input clock (selectable divide-by-2) Integrated 10-bit D/A converter Phase noise < 145 dBc/Hz @ 1 kHz offset Output frequency = 100 MHz (DAC output) 32-bit programmable frequency register Simplified 8-bit parallel and SPI® serial control interface Automatic frequency sweeping capability 4 frequency profiles 3.3 V power supply Power dissipation 2 W typical Integrated programmable charge pump and phase frequency detector with fast lock circuit Isolated charge pump supply up to 5 V Integrated 2 GHz mixer APPLICATIONS VHF/UHF LO synthesis Tuners Instrumentation Agile clock synthesis Cellular base station hopping synthesizer Radar Sonet/SDH clock synthesis GENERAL DESCRIPTION The AD9858 is a direct digital synthesizer (DDS) featuring a 10-bit DAC operating up to 1GSPS. The AD9858 uses advanced DDS technology, coupled with an internal high speed, high performance D/A converter to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency-agile analog output sine wave at up to 400+ MHz. The AD9858 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9858 via parallel (8-bit) or serial loading formats. The AD9858 contains an integrated charge pump (CP) and phase frequency detector (PFD) for synthesis applications requiring the combination of a high speed DDS along with phase-locked loop (PLL) functions. An analog mixer is also provided on-chip for applications requiring the combination of a DDS, PLL, and mixer, such as frequency translation loops, tuners, and so on. The AD9858 also features a divide-by-2 on the clock input, allowing the external clock to be as high as 2 GHz. The AD9858 is specified to operate over the extended industrial temperature range of –40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM ANALOG MULTIPLIER PHASE ACCUMULATOR DIV LO IF RF PD CP CPISET RESET DACISET IOUT IOUT FUD SYNCLK REFCLK REFCLK PROFILE SELECT I/O PORT (SER/PAR) DIGITAL PLL DAC DAC CLOCK CHARGE PUMP POWER- DOWN LOGIC PHASE DETECTOR TIMING AND CONTROL LOGIC PHASE-TO- AMPLITUDE CONVERSION ÷ M ÷ 8 ÷ 2 CONTROL REGISTERS ÷ N AD9858 15 FREQUENCY ACCUMULATOR 32 32 14 32 15 10 M U X Figure 1. |
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