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ECLAMP2504K.TCT Datasheet(PDF) 5 Page - Semtech Corporation |
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ECLAMP2504K.TCT Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 8 page 5 © 2010 Semtech Corp. www.semtech.com PRELIMINARY PROTECTION PRODUCTS EClamp2504K Applications Information Figure 3 - Recommended Layout Using Ground Vias Figure 4 - Filter Characteristics Using Recommended Layout with Internal Vias Figure 3 shows the recommended device layout. The ground pad vias have a diameter of 0.008 inches (0.20 mm) while the two external vias have a diameter of 0.010 inches (0.250mm). The internal vias are spaced approximately evenly from the center of the pad. The designer may choose to use more vias with a smaller diameter (such as 0.005 inches or 0.125mm) since changing the diameter of the via will result in little change in inductance (i.e. the log function in Equation 2 is highly insensitive to parameter d) . Figure 4 shows a typical insertion loss (S21) plot for the device using Semtech’s filter evaluation board with 50 Ohm traces and the recommended via configura- tion. 1 2 3 4 START . 030 MHz 3 STOP 000. 000000 MHz CH1 S21 LOG 6 dB / REF 0 dB 1: -4. 46 dB 250 M Hz 2: -26.206 dB 800 M Hz 3: -34.349 dB 1.8 GHz 4: -33.371 dB 2.7 GHz 1 GHz 100 MHz 3 GHz 10 MHz 1 MHz 0 dB -6 dB -12 dB -18 dB -24 dB -30 dB -36 dB -42 dB -48 dB |
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