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B39311B3714U410 Datasheet(PDF) 5 Page - TDK Electronics |
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B39311B3714U410 Datasheet(HTML) 5 Page - TDK Electronics |
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5 / 7 page  5 December 17, 2012 B3714 314.35 MHz SAW Components SAW filter Data sheet Please read cautions and warnings and important notes at the end of this document. 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 three figures show recommended “ESD matching” topologies. For wideband filters the high-pass ESD matching structure needs to be at least of 3rd order to ensure a proper matching for any impedance value of antenna and SAW filter input. The required component values have to be determined from case to case. Fig. 1 MLC varistor plus ESD matching Fig. 2 Suppressor diode plus ESD matching In cases where minor ESD occur, following simplified “ESD matching” topologies can be used alternatively. Fig. 3 3rd order high-pass structure for basic ESD protection In all three figures the shunt inductor Lp2 could be replaced by a shorted microstrip with proper length and width. If this configuration is possible depends on the operating frequency and available pcb space. 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 “Applications Notes”. Cs1 Lp2 Cs3 to output matching Lp2 Cs3 Cs1 to output matching Lp2 Cs3 Cs1 to output matching |
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