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Resumen del manual
3 mm APPLICATIONS Cellular base station receivers ISM receivers Radio links RF instrumentation FUNCTIONAL BLOCK DIAGRAM Adobe Systems 876131516COMMIFOPIFOM5COMM142134COMMRFCMRFINVPMXVPDCPWDNEXRBCOMM1112109VPLOLOCMLOINCOMMBIASAD834205352-001 Figure 1. GENERAL DESCRIPTION The AD8342 is a high performance, broadband active mixer. It is well suited for demanding receive-channel applications that require wide bandwidth on all ports and very low inter- modulation distortion and noise figure. The AD8342 provides a typical conversion gain of 3.7 dB with an RF frequency of 238 MHz. The integrated LO driver presents a 50 . input impedance with a low LO drive level, helping to minimize the external component count. The differential high impedance broadband RF port allows for easy interfacing to both active devices and passive filters. The RF input accepts input signals as large as 1.6 V p-p or 8 dBm (relative to 50 .) at P1dB. The open-collector differential outputs provide excellent bal- ance and can be used with a differential filter or IF amplifier, such as the AD8369 or AD8351. These outputs can also be con- verted to a single-ended signal through the use of a matching network or a transformer (balun). When centered on the VPOS supply voltage, the outputs may swing ±2 V differentially. The AD8342 is fabricated on an Analog Devices proprietary, high performance SiGe IC process. The AD8342 is available in a 16-lead LFCSP. It operates over a .40°C to +85°C temperature range. An evaluation board is also available. TABLE OF CONTENTS Specifications.....................................................................................3 AC Performance...............................................................................4 Spur Table..........................................................................................5 Absolute Maximum Ratings............................................................6 ESD Caution..................................................................................6 Pin Configuration and Function Descriptions.............................7 Typical Performance Characteristics.............................................8 Circuit Description.........................................................................14 AC Interfaces...................................................................................15 IF Port..........................................................................................16 LO Considerations.....................................................................17 High IF Applications..................................................................18 Evaluation Board............................................................................19 Outline Dimensions.......................................................................20 Ordering Guide..........................................................................20 REVISION HISTORY 4/05—Revision 0: Initial Version SPECIFICATIONS VS = 5 V, TA = 25°C, fRF = 238 MHz, fLO = 286 MHz, LO power = 0 dBm, ZO = 50 ., RBIAS = 1.82 k., RF termination = 100 ., IF termi- nated into 100 . through a 2:1 ratio balun, unless otherwise noted. Table 1. Parameter Conditions Min Typ Max Unit RF INPUT INTERFACE Return Loss Hi-Z input terminated with 100 . off-chip resistor 10 dB Input Impedance Frequency = 238 MHz (measured at RFIN with RFCM ac- grounded) 1||0.4 k.||pF DC Bias Level Internally generated; port must be ac-coupled 2.4 V OUTPUT INTERFACE Output Impedance Differential impedance, frequency = 48 MHz 10||0.5 k.||pF DC Bias Voltage Supplied externally 4.75 VS 5.25 V Power Range Via a 2:1 impedance ratio transformer 13 dBm LO INTERFACE Return Loss 10 dB DC Bias Voltage Internally generated; port must be ac-coupled VS . 1.6 V POWER-DOWN INTERFACE PWDN Threshold 3.5 V PWDN Response Time Device enabled, IF output to 90% of its final level 0.4 .s Device disabled, supply current <5 mA 4 .s PWDN Input Bias Current Device enabled .80 .A Device disabled +100 .A POWER SUPPLY Positive Supply Voltage 4.75 5 5.25 V Quiescent Current VPDC Supply current for bias cells 5 mA VPMX, IFOP, IFOM Supply current for mixer, RBIAS = 1.82 k. 58 mA VPLO Supply current for LO limiting amplifier 35 mA Total Quiescent Current VS = 5 V 85 98 113 mA Power-Down Current Device disabled 500 .A AC PERFORMANCE VS = 5 V, TA = 25°C, LO power = 0 dBm, ZO = 50 ., RBIAS = 1.82 k., RF termination 100 ., IF terminated into 100 . via a 2:1 ratio balun, unless otherwise noted. Table 2. Parameter Conditions Min Typ Max Unit RF FREQUENCY RANGE1 50 500 MHz LO FREQUENCY RANGE1 High side LO 60 850 MHz IF FREQUENCY RANGE1 10 350 MHz CONVERSION GAIN fRF = 460 MHz, fLO = 550 MHz, fIF = 90 MHz 3.2 dB fRF = 238 MHz, fLO = 286 MHz, fIF = 48 MHz 3.7 dB SSB NOISE FIGURE fRF = 460 MHz, fLO = 550 MHz, fIF = 90 MHz 12.5 dB fRF = 238 MHz, fLO = 286 MHz, fIF = 48 MHz 12.2 dB INPUT THIRD-ORDER INTERCEPT fRF1 = 460 MHz, fRF2 = 461 MHz, fLO = 550 MHz, fIF1 = 90 MHz, fIF2 =...
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