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AD8347ARUZ Datasheet(PDF) 1 Page - Analog Devices |
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AD8347ARUZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page 0.8 GHz to 2.7 GHz Direct Conversion Quadrature Demodulator AD8347 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 Analog Devices, Inc. All rights reserved. FEATURES FUNCTIONAL BLOCK DIAGRAM Integrated RF and baseband AGC amplifiers RFIN VREF RFIP VPS2 IMXO COM3 IOPP IOFS IOPN VCMO VPS1 LOIN IAIN COM2 VDT2 QMXO QOPP QOFS QOPN VAGC COM3 VGIN ENBL LOIP COM1 VDT1 QAIN VPS3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AD8347 PHASE SPLITTER PHASE SPLITTER GAIN CONTROL BIAS DET Quadrature phase accuracy 1° typ I/Q amplitude balance 0.3 dB typ Third-order intercept (IIP3) +11.5 dBm @ min gain Noise figure 11 dB @ max gain AGC range 69.5 dB Baseband level control circuit Low LO drive −8 dBm ADC-compatible I/Q outputs Single supply 2.7 V to 5.5 V Power-down mode 28-lead TSSOP package APPLICATIONS Figure 1. Cellular base stations Radio links Wireless local loop IF broadband demodulators RF instrumentation Satellite modems GENERAL DESCRIPTION Baseband level detectors are included for use in an AGC loop to maintain the output level. The demodulator dc offsets are minimized by an internal loop, whose time constant is controlled by external capacitor values. The offset control can also be overridden by forcing an external voltage at the offset nulling pins. The AD83471 is a broadband direct quadrature demodulator with RF and baseband automatic gain control (AGC) amplifiers. It is suitable for use in many communications receivers, performing quadrature demodulation directly to baseband frequencies. The input frequency range is 800 MHz to 2.7 GHz. The outputs can be connected directly to popular A-to-D converters such as the AD9201 and AD9283. The baseband variable gain amplifier outputs are brought off- chip for filtering before final amplification. By inserting a channel selection filter before each output amplifier, high level out-of-channel interferers are eliminated. Additional internal circuitry also allows the user to set the dc common-mode level at the baseband outputs. The RF input signal goes through two stages of variable gain amplifiers prior to two Gilbert-cell mixers. The LO quadrature phase splitter employs polyphase filters to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range. Separate I and Q channel variable gain amplifiers follow the baseband outputs of the mixers. The RF and baseband amplifiers together provide 69.5 dB of gain control. A precision control circuit sets the linear-in-dB RF gain response to the gain control voltage. 1 U.S. patents issued and pending. |
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