SAW Components SAW filter Short range devices Series/type: Ordering code: B3748 B39431B3748H110 Date: Version: February 10, 2009 2.0 EPCOS AG 2009. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information contained therein without EPCOS’ prior express consent is prohibited. SAW Components B3748 434.42 MHz SAW filter Data sheet Application ■ Low-loss RF filter for remote control receivers ■ Balanced and unbalanced operation possible Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Package size 3.0 x 3.0 x 1.0 mm3 Package code DCC6E RoHS compatible Approximate weight 0.037 g Package for Surface Mount Technology (SMT) Ni, gold-plated terminals Lead free soldering compatible with J - STD20C Passivation layer Elpas AEC-Q200 qualified component family Electrostatic Sensitive Device (ESD) Pin configuration1) ■ ■ ■ ■ ■ 1 2 4 5 3,6 Input (recommended) or input ground Input ground (recommended) or input Output (recommended) or output ground Output ground (recommended) or output to be grounded 1) The recommended pin configuration usually offers best suppression of electrical crosstalk. The filter characteristics refer to this configuration. Please read cautions and warnings and important notes at the end of this document. 2 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet Characteristics Temperature range for specification: Terminating source impedance: Terminating load impedance: T = –45 ˚C to +95 ˚C ZS = 50 Ω and matching network ZL = 50 Ω and matching network min. max. — typ. @ 25 ˚C 434.42 — MHz — — 1.9 1.5 2.6 2.2 dB dB Pass band (relative to αmin) 434.27 ... 434.57 MHz 434.24 ... 434.60 MHz — — 0.6 0.8 2.0 3.0 dB dB Relative attenuation (relative to αmin) αrel 10.00 ... 380.00 MHz 380.00 ... 414.00 MHz 414.00 ... 422.00 MHz 422.00 ... 427.00 MHz 427.00 ... 432.92 MHz 432.92 ... 433.60 MHz 435.60 ... 445.00 MHz 445.00 ... 450.00 MHz 450.00 ... 810.00 MHz 810.00 ... 1500.00 MHz 1500.00 ... 2500.00 MHz 55 50 46 40 24 13 25 40 45 60 50 60 56 52 48 29 20 29 46 54 65 58 — — — — — — — — — — — dB dB dB dB dB dB dB dB dB dB dB Impedance for pass band matching1) Input: ZIN = RIN || CIN Output: ZOUT = ROUT || COUT — — 350 || 2.2 350 || 2.2 — — Ω || pF Ω || pF Center frequency fC Minimum insertion attenuation incl. loss in matching elements (QL = 47) excl. loss in matching elements αmin 1) Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load impedance (here 50 Ohm). After removal of the SAW filter the input impedance of the input and output matching network is calculated. The conjugate complex value of these characteristic impedances are the input and output impedances for flat passband. For more details we refer to EPCOS application note #4. Please read cautions and warnings and important notes at the end of this document. 3 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet Maximum ratings Operable temperature range T Storage temperature range Tstg DC voltage Source power VDC PS Please read cautions and warnings and important notes at the end of this document. –45/+125 ˚C –45/+125 ˚C 6 10 V dBm 4 source impedance 50 Ω February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit) Ls1 = 39 nH Ls2 = 39 nH Minimising the crosstalk For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with a good RF layout. The major crosstalk mechanism is caused by the “ground-loop” problem. Grounding loops are created if input-and output transducer GND are connected on the top-side of the PCB and fed to the system grounding plane by a common via hole. To avoid the common ground path, the ground pin of the input- and output transducer are fed to the system ground plane (bottom PCB plane) by their own via hole. The transducers’ grounding pins should be isolated from the upper grounding plane. A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB. The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection Optimised PCB layout for SAW filters in DCC6E package, pinning 1,4 (top side, scale 1:1) The bottom side is a copper plane (system ground area). The input and output grounding pins are isolated and connected to the common ground by separated via holes. For good contact of the upper grounding area with the lower side it is necessary to place enough via holes. Please read cautions and warnings and important notes at the end of this document. 5 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet ESD protection of SAW filters SAW filters are Electro Static Discharge sensitive devices. To reduce the probability of damages caused by ESD, special matching topologies have to be applied. In general, “ESD matching” has to be ensured at that filter port, where electrostatic discharge is expected. Electrostatic discharges predominantly appear at the antenna input of RF receivers. Therefore only the input matching of the SAW filter has to be designed to short circuit or to block the ESD pulse. Below two figures show recommended “ESD matching” topologies. Depending on the input impedance of the SAW filter and the source impedance, the needed component values have to be determined from case to case. MLC1 Ls3 Ls3 to output matching Lp2 Dp1 Fig. 1 MLC varistor plus ESD matching to output matching Lp2 Fig. 2 Suppressor diode plus ESD matching In cases where minor ESD occur, following simplified “ESD matching” topologies can be used alternatively. Cs1 Ls2 Lp1 to output matching Lp2 Fig. 3 shunt L – series L matching to output matching Fig. 4 series C – shunt L matching Effectiveness of the applied ESD protection has to be checked according to relevant industry standards or customer specific requirements. For further information, please refer to EPCOS Application report: “ESD protection for SAW filters”. This report can be found under www.epcos.com/rke. Click on “data sheets” and then “Applications” under category “Further information”. Please read cautions and warnings and important notes at the end of this document. 6 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet Transfer function Transfer function (wideband) Please read cautions and warnings and important notes at the end of this document. 7 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet Transfer function (ultimate rejection) Please read cautions and warnings and important notes at the end of this document. 8 February 10, 2009 SAW Components B3748 434.42 MHz SAW filter Data sheet References Type B3748 Ordering code B39431B3748H110 Marking and package C61157-A7-A143 Packaging F61074-V8228-Z000 Date codes L_1126 B3748_SB.s2p S-parameters B3748_WB.s2p See file header for port/pin assignment table.B3748_NB.s2p Soldering profile S_6001 RoHS compatible defined as compatible with the following documents: "DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. 2005/618/EC from April 18th, 2005, amending Directive 2002/95/EC of the European Parliament and of the Council for the purposes of establishing the maximum concentration values for certain hazardous substances in electrical and electronic equipment." For further information please contact your local EPCOS sales office or visit our webpage at www.epcos.com . Published by EPCOS AG Surface Acoustic Wave Components Division P.O. Box 80 17 09, 81617 Munich, GERMANY EPCOS AG 2009. This brochure replaces the previous edition. For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or the international Representatives. Due to technical requirements components may contain dangerous substances. For information on the type in question please also contact one of our Sales Offices. Please read cautions and warnings and important notes at the end of this document. 9 February 10, 2009 Important notes The following applies to all products named in this publication: 1. 2. 3. 4. 5. 6. 7. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application. As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether an EPCOS product with the properties described in the product specification is suitable for use in a particular customer application. We also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified. In customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. The warnings, cautions and product-specific notes must be observed. In order to satisfy certain technical requirements, some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous). Useful information on this will be found in our Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed questions, please contact our sales offices. We constantly strive to improve our products. Consequently, the products described in this publication may change from time to time. The same is true of the corresponding product specifications. Please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. We also reserve the right to discontinue production and delivery of products. Consequently, we cannot guarantee that all products named in this publication will always be available. The aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. Unless otherwise agreed in individual contracts, all orders are subject to the current version of the “General Terms of Delivery for Products and Services in the Electrical Industry” published by the German Electrical and Electronics Industry Association (ZVEI). The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSSP, CTVS, DSSP, MiniBlue, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseMod, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trademarks registered or pending in Europe and in other countries. Further information will be found on the Internet at www.epcos.com/trademarks. 10 February 10, 2009