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B39431B3774Z810 Datasheet(PDF) 6 Page - TDK Electronics |
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B39431B3774Z810 Datasheet(HTML) 6 Page - TDK Electronics |
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6 / 10 page  6 December 20, 2012 B3774 433.92 MHz Please read cautions and warnings and important notes at the end of this document. SAW Components 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. 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 shunt L – series L 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 “Applications Notes”. Lp2 Ls3 to output matching Lp2 Ls3 Dp1 matching to output Lp1 Ls2 matching to output Lp2 Cs1 matching to output |
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