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AD7466 Fiches technique(PDF) 1 Page - Analog Devices |
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AD7466 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 5 page Circuit Note CN-0178 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/CN0178. Devices Connected/Referenced ADL5902 50 MHz to 9 GHz, 65 dB TruPwr™ Detector AD7466 Micropower, 12-Bit, 200 kSPS SAR ADC Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System Rev.A 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 ©2010 –2011 Analog Devices, Inc. All rights reserved. EVALUATION AND DESIGN SUPPORT Circuit Evaluation Boards CN-0178 Circuit Evaluation Board (EVAL-CN0178-SDPZ) System Demonstration Platform (EVAL-SDP-CB1Z) Design and Integration Files Schematics, Layout Files, Bill of Materials CIRCUIT FUNCTION AND BENEFITS This circuit uses the ADL5902 TruPwr™ detector to measure the rms signal strength of RF signals with varying crest factors (peak-to-average ratio) over a dynamic range of approximately 65 dB and operates at frequencies from 50 MHz up to 9 GHz. The measurement result is provided as serial data at the output of a 12-bit ADC (AD7466). A simple 4-point system calibration at ambient temperature is performed in the digital domain. The interface between the RF detector and the ADC is straightforward, consisting of two signal scaling resistors and no active components. In addition, the ADL5902 internal 2.3 V reference voltage provides the supply and reference voltage for the micropower ADC. The AD7466 has no pipeline delay and is operated as a read-only SAR ADC. The overall circuit achieves temperature stability of approximately ±0.5 dB. X2 BIAS AND POWER- DOWN CONTROL 1 NC NC NC LINEAR-IN-dB VGA (NEGATIVE SLOPE) IDET 26pF 2 3 4 11 10 9 5 6 8 16 15 14 13 ADL5902 12 VREF 2.3V TEMPERATURE SENSOR INLO INHI VPOS VPOS TEMP VOUT CLPF COMM COMM VTGT VREF TADJ G = 5 ITGT X2 C9 0.1µF AD7466 12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC GND VDD VIN SCLK SDATA T/H CS C4 100pF C3 0.1µF C5 100pF C7 0.1µF +5V +5V R12 301Ω R11 2kΩ R9 1430Ω R10 3.74kΩ 3 1 2 C9A 0.1µF C10A 10µF 4 5 6 DGND CLK DATA CS R10 1.21kΩ R11 2kΩ RFIN R3 60.4Ω C12 100pF C10 100pF 7 VSET Figure 1. Software-Calibrated RF Power Measurement System |
Numéro de pièce similaire - AD7466 |
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Description similaire - AD7466 |
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