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AD8352 Datasheet(PDF) 1 Page - Analog Devices |
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AD8352 Datasheet(HTML) 1 Page - Analog Devices |
1 / 3 page Circuit Note CN-0046 Circuit Designs Using Analog Devices Products Apply these product pairings quickly and with confidence. For more information and/or support call 1-800-AnalogD (1-800-262-5643) or visit www.analog.com/circuit. Devices Connected/Referenced AD8352 Ultralow Distortion Differential RF/IF Amplifier AD9445 14-Bit, 105 MSPS/125 MSPS Analog-to- Digital Converter Using the AD8352 as an Ultralow Distortion Differential RF/IF Front End for High Speed ADCs Rev. A “Circuits from the Lab” from Analog Devices have been designed and built by Analog Devices engineers. Standard engineering practices have been employed in the design and construction of eachcircuit,andtheirfunctionandperformance havebeentestedandverifiedinalabenvironment atroomtemperature.However,youaresolelyresponsible fortestingthe circuit anddetermining its suitability and applicability for your use and application. Accordingly, in no event shall Analog Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to anycausewhatsoeverconnectedtotheuseofany“CircuitfromtheLab”. (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 ©2008–2009 Analog Devices, Inc. All rights reserved. CIRCUIT FUNCTION AND BENEFITS These circuits provide both a single-ended and a differential configuration for driving high speed ADCs using the AD8352 ultralow distortion differential RF/IF amplifier. The AD8352 provides the gain, isolation, and distortion performance necessary for efficiently driving high linearity converters, such as the AD9445. This device also provides balanced outputs whether driven differentially or single-ended, thereby maintaining excellent second-order distortion levels. CIRCUIT DESCRIPTION Figure 1 and Figure 2 illustrate two front-end circuits for driving the AD9445 14-bit ADC at 105 MSPS. Figure 1 provides a differential input configuration, while Figure 2 provides a single-ended input configuration. In the differential configuration shown in Figure 1, the input 49.9 Ω resistor provides a differential input impedance to the 50 Ω RF/IF source. When the driver is located less than approximately one eighth of the wavelength of the maximum input RF/IF frequency from the AD8352, impedance matching is not required, thereby eliminating the need for this termination resistor. The output 24 Ω series resistors provide isolation from the input capacitance of the ADC, and the optimum value is determined empirically. The 100 MHz FFT plots shown in Figure 3 and Figure 4 display the performance results for the differential configuration. In the single-ended input configuration shown in Figure 2, the net input impedance at VIP is RN (200 Ω) plus the external 24.9 Ω balancing resistor, or ~225 Ω. This requires a 64.9 Ω parallel resistor to provide the input impedance match for a 50 Ω source. If input reflections are minimal, this impedance match is not required. The 200 Ω resistor (RN) is required to balance the output voltages to minimize second-order distortion. The single-ended configuration provides −3 dB bandwidths similar to input differential drive and shows little or no degradation in overall third-order harmonic performance. The single-ended, third-order distortion levels are similar to the AD8352 49.9 Ω CD RD RG 0.1µF 0.1µF 0.1µF 0.1µF 16 1 2 3 4 5 24 Ω 0.1µF 10 24 Ω 0.1µF 11 8, 13 14 6, 7, 9, 12 AD9445 50 Ω SOURCE IF/RF INPUT MINICIRCUITS ADT1-1WT 5V Figure 1. Differential Input to the AD8352 Driving the AD9445 14-Bit, 105 MSPS/125 MSPS ADC (Simplified Schematic, All Connections Not Shown) |
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Descripción similar - AD8352 |
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