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AD9779A Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9779A Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 3 page Circuit Note CN-0019 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 AD9779A Dual 16-Bit, 1 GSPS DAC ADL5373 2300 MHz to 3000 MHz I/Q Modulator Interfacing the ADL5373 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC 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 This circuit provides a simple, elegant interface between the ADL5373 I/Q modulator and the AD9779A high speed DAC. The ADL5373 and the AD9779A are well-matched devices because they have the same bias levels and similarly high signal-to-noise ratios (SNR). The matched bias levels of 500 mV allow for a “glueless” interface—there is no requirement for a level shifting network that would add noise and insertion loss along with extra components. The addition of the swing- limiting resistors (RSLI, RSLQ) allows the DAC swing to be scaled appropriately without loss of resolution or of the 0.5 V bias level. The high SNR of each device preserves a high SNR through the circuit. CIRCUIT DESCRIPTION The ADL5373 is designed to interface with minimal components to members of Analog Devices family of TxDAC® converters (AD97xx). The baseband inputs of the ADL5373 require a dc common-mode bias voltage of 500 mV. With each AD9779A output swinging from 0 mA to 20 mA, a single 50 Ω resistor to ground from each of the DAC outputs provides the desired 500 mV dc bias. With just the four 50 Ω resistors in place, the voltage swing on each pin is 1 V p-p. This results in a differential voltage swing of 2 V p-p on each input pair. By adding resistors RSLI and RSLQ to the interface, the output swing of the DAC can be reduced without any loss of DAC resolution. The resistor is placed as a shunt between each side of RBIP 50 Ω RBIN 50 Ω 93 92 19 20 IBBN IBBP AD9779A ADL5373 RBQN 50 Ω RBQP 50 Ω 84 83 23 24 RSLI 100 Ω RSLQ 100 Ω OUT1_N OUT1_P OUT2_P OUT2_N QBBP QBBN Figure 1. Interface Between the AD9779A and ADL5373 with 50 Ω Resistors to Ground to Establish the 500 mV DC Bias for the ADL5373 Baseband Inputs (Simplified Schematic) |
Podobny numer części - AD9779A |
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Podobny opis - AD9779A |
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