AD8342

Active Receive Mixer LF to 500 MHz AD8342 FEATURES Broadband RF port: LF to 500 MHz Conversion gain: 3.7 dB Noise figure: 12.2 dB Input IP3: 22.7 dBm Input P1dB: 8.3 dBm LO drive: 0 dBm Differential high impedance RF input port Single-ended, 50 Ω LO input port Single-supply operation: 5 V @ 98 mA Power-down mode Exposed paddle LFCSP: 3 mm × 3 mm FUNCTIONAL BLOCK DIAGRAM VPDC PWDN EXRB COMM 12 COMM 13 RFCM 14 RFIN 15 VPMX 16 11 BIAS 10 9 8 7 6 5 COMM IFOP IFOM COMM 05352-001 AD8342 1 VPLO 2 LOCM 3 LOIN 4 COMM Figure 1. APPLICATIONS Cellular base station receivers ISM receivers Radio links RF instrumentation 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 ver y low intermodulation 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 Ω 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 Ω) at P1dB. The open-collector differential outputs provide excellent balance and can be used with a differential filter or IF amplifier, such as the AD8369 or AD8351. These outputs can also be converted 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 proprietar y, 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. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2005 Analog Devices, Inc. All rights reserved. AD8342 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 Rev. 0 | Page 2 of 20 AD8342 SPECIFICATIONS VS = 5 V, TA = 25°C, fRF = 238 MHz, fLO = 286 MHz, LO power = 0 dBm, ZO = 50 Ω, RBIAS = 1.82 kΩ, RF termination = 100 Ω, IF terminated into 100 Ω through a 2:1 ratio balun, unless otherwise noted. Table 1. Parameter RF INPUT INTERFACE Return Loss Input Impedance DC Bias Level OUTPUT INTERFACE Output Impedance DC Bias Voltage Power Range LO INTERFACE Return Loss DC Bias Voltage POWER-DOWN INTERFACE PWDN Threshold PWDN Response Time PWDN Input Bias Current POWER SUPPLY Positive Supply Voltage Quiescent Current VPDC VPMX, IFOP, IFOM VPLO Total Quiescent Current Power-Down Current Conditions Hi-Z input terminated with 100 Ω off-chip resistor Frequency = 238 MHz (measured at RFIN with RFCM acgrounded) Internally generated; port must be ac-coupled Differential impedance, frequency = 48 MHz Supplied externally Via a 2:1 impedance ratio transformer Min Typ 10 1||0.4 2.4 10||0.5 VS Max Unit dB kΩ||pF V kΩ||pF V dBm dB V V µs µs µA µA 5.25 V mA mA mA mA µA 4.75 5.25 13 Internally generated; port must be ac-coupled 10 VS − 1.6 3.5 0.4 4 −80 +100 4.75 5 5 58 35 98 500 Device enabled, IF output to 90% of its final level Device disabled, supply current