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AD9467 Datasheet(PDF) 1 Page - Analog Devices |
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AD9467 Datasheet(HTML) 1 Page - Analog Devices |
1 / 6 page Circuit Note CN-0268 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/CN0268. Devices Connected/Referenced ADL5565 6 GHz Ultrahigh Dynamic Range Differential Amplifier AD9467 16-Bit, 200 MSPS/250 MSPS ADC Resonant Approach to Designing a Band-Pass Filter for Narrow-Band, High IF, 16-Bit, 250 MSPS Receiver Front End 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 ©2012 Analog Devices, Inc. All rights reserved. EVALUATION AND DESIGN SUPPORT Design and Integration Files Schematics, Layout Files, Bill of Materials CIRCUIT FUNCTION AND BENEFITS The circuit shown in Figure 1 is a 16-bit, 250 MSPS, narrow-band, high IF receiver front end with an optimum interface between the ADL5565 differential amplifier and the AD9467 ADC. The AD9467 is a buffered input 16-bit, 200 MSPS or 250 MSPS ADC with SNR performance of approximately 75.5 dBFS and SFDR performance between 95 dBFS and 98 dBFS. The ADL5565 differential amplifier is suitable for driving IF sampling ADCs because of its high input bandwidth, low distortion, and high output linearity. This circuit note describes a systematic procedure for designing the interface circuit and the antialiasing filter that maintains high performance and ensures minimal signal loss. A resonant approach is used to design a maximally flat Butterworth fourth- order band-pass filter with a center frequency of 200 MHz. CIRCUIT DESCRIPTION The advantages of using a differential amplifier to drive a high speed ADC include signal gain, isolation, and source impedance matching to the ADC. The ADL5565 allows pin-strappable gain adjustments of 6 dB, 12 dB, or 15.5 dB. Alternatively, by applying two external resistors to the inputs, finer gain steps can be achieved within the 0 dB to 15.5 dB range. Additionally, the ADL5565 offers high output linearity, low distortion, low noise, and wide input bandwidth. The 3 dB bandwidth is 6 GHz, and the 0.1 dB flatness is 1 GHz. The ADL5565 is capable of achieving an output third-order intercept (OIP3) of greater than 50 dB. 0.1µF ADL5565 G = 6dB 3.5pF 530Ω 0.1µF 33Ω 33Ω 1nF 1nF XFMR 1:1 Z ECT1-1-13M INPUT Z = 50Ω INTERNAL INPUT Z AD9467 16-BIT 250MSPS ADC 15Ω 15Ω 310Ω 5.6Ω 5.6Ω 39nH 2pF VIP2 VIN2 5Ω 5Ω +3.3V +1.8V VIP1 VIN1 ZI = 200Ω +3.3V FS = 2V p-p DIFF 8.2pF 39nH 150nH 150nH 180nH Figure 1. Resonant Filter Design for Narrow Band High IF Applications Using the ADL5565 Differential Amplifier and the AD9467 ADC |
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