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AD7266 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7266 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 7 page Circuit Note CN-0187 Circuits from the Lab™ reference circuits are engineered and tested for quick and easysystemintegrationto helpsolve today’s analog, mixed-signal, and RF design challenges. For more informationand/orsupport,visitwww.analog.com/CN0187. Devices Connected/Referenced ADL5502 450 MHz to 6 GHz Crest Factor Detector AD7266 Differential/Single-Ended Input, Dual, Simultaneous Sampling, 2 MSPS, 12-Bit, 3-Channel SAR Analog-to-Digital Converter ADA4891-4 Low Cost, Quad, CMOS, High Speed, Rail-to- Rail Amplifier ADP121 150 mA, Low Quiescent Current, CMOS Linear Regulator in 5-Lead TSOT or 4-Ball WLCSP Crest Factor, Peak, and RMS RF Power Measurement Circuit Optimized for High Speed, Low Power, and Single 3.3 V Supply Rev.0 Circuitsfromthe Lab™circuitsfromAnalog Deviceshave been designedandbuiltbyAnalogDevices engineers. Standard engineering practices have been employed in the design and construction of eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat room temperature. However, you are solely responsible for testing the circuit and determining its suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage) 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 ©2011 Analog Devices, Inc. All rights reserved. EVALUATION AND DESIGN SUPPORT Circuit Evaluation Boards CN-0187 Circuit Evaluation Board (EVAL-CN0187-SDPZ) System Demonstration Platform (EVAL-SDP-CB1Z) Design and Integration Files Schematics, Layout Files, Bill of Materials CIRCUIT FUNCTION AND BENEFITS The circuit shown in Figure 1 measures peak and rms power at any RF frequency from 450 MHz to 6 GHz over a range of approximately 45 dB. The measurement results are converted to differential signals in order to eliminate noise and are provided as digital codes at the output of a 12-bit SAR ADC with serial interface and integrated reference. A simple two- point calibration is performed in the digital domain. U3-A U3-D U1 COMM ENBL VA1 VA2 VB1 VB2 DCAPB DCAPA 0.47µF 27Ω 27Ω 27Ω AGND DGND 10kΩ 10kΩ 0.47µF 220Ω 220Ω 220Ω 442Ω 75Ω +3.3V CFLTR* +3.3V 0.01µF 0.01µF RFIN 0.01µF 0.1µF 1000pF +3.3V +3.3V AVDD DVDD VDRIVE CS DOUTA SCLK ADP121 ADL5502 AD7266 +5.5V +3.3V 1µF VIN FLTR VPOS RFIN VRMS PEAK CNTL VOUT EN GND 1µF SDP BOARD AND SUPPORT CIRCUITS NOTE: U2 AND U3 ARE ADA4891-4 CONTROL (HIGH RESET; LOW PEAK HOLD) U5 U6 +1.25V +1.25V +2.5V * * * * *SEE TEXT 8 4 1 2 3 7 6 5 U2-B U3-B 27Ω U2-D 10kΩ 10kΩ 0.47µF 220Ω 220Ω 220Ω 442Ω +3.3V U3-D U3-A 0.47µF +2.5V U2-A U2-C U3-C Figure 1. High Speed, Low Power, Crest Factor, Peak, and RMS Power Measurement System (Simplified Schematic: All connections and Decoupling Not Shown) |
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Podobny opis - AD7266 |
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