AN-1151 Application Note One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Using a Johanson 2450BM14E0007 Impedance-Matched, Integrated Filter Balun with the ADF7241 and ADF7242 by Mary O’Keefe INTRODUCTION EVALUATION BOARD LAYOUT This application note describes the use and performance achieved using the Johanson Technology, Inc., 2450BM14E0007 impedancematched (complex differential impedance value) filter balun with the ADF7241 or ADF7242 2.4 GHz RF transceivers. The filter balun from Johanson Technology effectively reduces the RF front-end component count and layout space. This balun is 100% RF tested by Johanson Technology. The Additional Information from Johanson Technology section provides more insight about how harmonic emissions are attenuated, as well as further details about the balun component. An outline of the RF board layout is shown in Figure 1. Gerber files of the board layout are available on the Analog Devices, Inc., ADF7242 evaluation board product website. Because the impedance seen by the balun is inherently dependent on the layout, it is recommended to follow the EVAL-ADF724xDB3Z layout as shown in the Gerber files as closely as possible for optimum performance. The board schematic is shown in Figure 2. Note that the C7 and C8 capacitors are required for power amplifier stability, and the specified 10 nF value should be used. Table 1. Key Parameters of the Filter Balun Parameter Part Number Frequency Unbalanced Port Impedance Balanced Port Impedance Description 2450BM14E0007 2400 MHz to 2500 MHz 50 Ω Matched to ADF7241/ADF7242 RF port impedance TYPICAL PERFORMANCE DATA Table 2 shows typical performance data obtained from the ADF7241 and ADF7242 using the 2450BM14E0007 impedancematched filter balun. Table 2. Typical Performance of the ADF7241 and ADF7242 Using the 2450BM14E0007 Filter Balun Value 3 dBm −50 dBm −47 dBm 10634-001 Parameter Tx Output Power Harmonics 4.9 GHz 7.35 GHz Figure 1. EVAL-ADF724xDB3Z Board Layout Highlighting Balun Location Rev. 0 | Page 1 of 8 AN-1151 Application Note TABLE OF CONTENTS Introduction ...................................................................................... 1 Revision History ................................................................................2 Typical Performance Data ............................................................... 1 Evaluation Board Schematic ............................................................3 Evaluation Board Layout ................................................................. 1 Additional Information from Johanson Technology ....................4 REVISION HISTORY 5/12—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Application Note AN-1151 10634-002 EVALUATION BOARD SCHEMATIC Figure 2. EVAL-ADF724xDB3Z Schematic Rev. 0 | Page 3 of 8 AN-1151 Application Note ADDITIONAL INFORMATION FROM JOHANSON TECHNOLOGY The following content and logos are provided courtesy of Johanson Technology, Inc. Johanson Technology is an independent corporation and is not owned by, controlled by, or an affiliate of Analog Devices, Inc. Analog Devices, Inc., makes no representations or warranties with respect to the Johanson 2450BM14E007 or any other Johanson Technology products. High Frequency Ceramic Solutions 2.4 GHz Im pedance-Matched Balun-Filter Integrated Passive for ADF7241 and AADF7242 Detail Specification: P/N 2450BM14E0007 5/15/2012 Page 1 of 3 General Specifications Part Num ber 2450BM14E0007 Frequency (MHz) 2400 - 2500 50 Ω Unbalanced Impedance (Antenna Out) Insertion Loss 1.5 dB max. Return Loss 9.5 dB min. 180° ± 10° Phase Difference Balanced Differential Im pedance Conjugate match to ADI ADF7241 and ADF7242 Am plitude Difference 2.0 dB max. Attenuation (dB) 25min.@4800~5000MHz 25min.@7200~7500MHz Operating Tem perature -40 to +85°C Pow er Capacity 2W max. Recom m ended Storage Tem perature +5 to +35°C, Humidity: 45-75%RH, 18 mos. Max * Reel Quanity 4,000 *18 months in vacuum sealed bag and 1 week cumulative after opened. For more info go to www.johansontechnology.c om/silverleads .html Packaging Style P/N Suffix Termination Style Bulk Suffix = S T & R (Paper) Suffix = E Eg. 2450BM14E0007S Eg. 2450BM14E0007T AgPt Suffix = None Eg. 2450BM14E0007(S or T) Term inal Configuration No. Function 1 Mechanical Dimensions In mm c Unbalanced Port 2 GND 3 Balanced Port L 0.063 ± 0.004 1.60 ± 0.10 4 Balanced Port W 0.031 ± 0.004 0.80 ± 0.10 5 GND T 0.024 ± 0.004 0.60 ± 0.10 6 GND a 0.008 ± 0.004 0.20 ± 0.10 b 0.008 +.004/-.006 0.20 +0.1/-0.15 c 0.006 ± 0.004 0.15 ± 0.10 g 0.012 ± 0.004 0.30 ± 0.10 p 0.020 ± 0.002 0.50 ± 0.05 W L a p 3 2 1 4 5 6 T g b Mounting Considerations Mount these devices w ith brow n mark facing up. * Line w idth should be designed to provide 50 Ω 0.25 impedance matching characteristics. 10nF caps (f or DC-Block) Solder Resist Land ADF724X Units: mm 0.3 0.55 Through-hole ( f 0.2/0.35) * SAC 305 Solder Paste Recommended 0.25 Units: mm Johanson Technology, Inc. reserves the right to make design changes w ithout notice. All sales are subject to Johanson Technology, Inc. terms and conditions. www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.182 2012 Johanson Technology, Inc. All Rights Reserved Rev. 0 | Page 4 of 8 Application Note Preliminary AN-1151 High Frequency Ceramic Solutions 2.4 GHz Impedance-Matched Balun-Filter Integrated Passive for ADF7242 P/N 2450BM14E0007 Detail Specification: 02/15/12 Page 2 of 3 Layout Details ) ) ) ) ) ) Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 2012 Johanson Technology, Inc. All Rights Reserved Rev. 0 | Page 5 of 8 AN-1151 Application Note High Frequency Ceramic Solutions Preliminary 2.4 GHz Impedance-Matched Balun-Filter Integrated Passive for ADF7242 P/N 2450BM14E0007 Detail Specification: 02/15/12 Page 3 of 3 Typical Electrical Performance (T=25°C) 0 ) -10 Insertion Loss Return Loss dB(RL) dB(IL) ) -20 -30 -40 -50 2 3 4 5 ) 7 8 freq, GHz 200 20 ) 10 ) 0 ) 100 0 -100 -10 -20 2.0 2.5 dif_Phase dif_Amplitude 6 -200 3.0 freq, GHz Actual Picture: Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 2012 Johanson Technology, Inc. All Rights Reserved Rev. 0 | Page 6 of 8 Application Note AN-1151 NOTES Rev. 0 | Page 7 of 8 AN-1151 Application Note NOTES ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AN10634-0-5/12(0) Rev. 0 | Page 8 of 8