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AD9122 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9122 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 9 page Circuit Note CN-0205 Circuits from the Lab™ reference circuits are engineered and testedfor quickandeasysystemintegrationtohelpsolvetoday’s analog, mixed-signal, and RF design challenges. For more informationand/orsupport, visitwww.analog.com/CN0205. Devices Connected/Referenced AD9122 Dual Channel, 1.2 GSPS, 16-Bit, TxDAC® Digital-to Analog Converter ADL5375 Broadband Quadrature Modulator Interfacing the ADL5375 I/Q Modulator to the AD9122 Dual Channel, 1.2 GSPS High Speed DAC Rev. 0 CircuitsfromtheLab™circuitsfromAnalogDeviceshavebeendesignedandbuiltbyAnalogDevices 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 AD9122/ADL5375 Evaluation Board (AD9122-M5375-EBZ) Design and Integration Files Schematics, Layout Files, Bill of Materials CIRCUIT FUNCTION AND BENEFITS This circuit provides a simple and flexible interface between the AD9122 dual high speed TxDAC digital-to-analog converter and the ADL5375-05 broadband I/Q modulator. Because the DAC outputs and ADL5375-05 I/Q modulator inputs share a common bias level of 0.5 V, there is no need for any active or passive level shifting circuitry. The dc coupled interface facilitates I/Q modulator local oscillator (LO) leakage compensation by the DAC. The 1.2 GSPS AD9122 DAC sampling rate and the wide bandwidth of the ADL5375-05 modulator I and Q inputs ensure that both zero-IF (ZIF) or complex-IF (CIF) architectures can be supported. In addition to filtering Nyquist images, the baseband filter provides excellent rejection of both differential-mode and common-mode DAC spurs. CIRCUIT DESCRIPTION The circuit and board shown in Figure 1 and Figure2 utilize the AD9122 TxDAC and the ADL5375-05 wideband transmit modulator. Signal biasing and scaling in the interface circuit is controlled by the four ground-referenced resistors (RBIP, RBIN, RBQP, RBQN) and the two shunt resistors (RSLI,RSLQ), respectively. RBIP 50Ω RBIN 50Ω 67 66 IBBN IBBP AD9122 ADL5375-05 RBQN 50Ω RBQP 50Ω 59 58 21 22 9 10 RSLI 100Ω RSLQ 100Ω IOUT1N IOUT1P IOUT2P IOUT2N QBBP QBBN LOW-PASS FILTER LOW-PASS FILTER Figure 1. Interface Between the AD9122 and ADL5375-05 with 50 Ω Resistors to Ground to Establish the 500 mV DC Bias for the ADL5375-05 Baseband Inputs (Simplified Schematic) |
Podobny numer części - AD9122 |
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Podobny opis - AD9122 |
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