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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2744 датащи(PDF) 20 Page - STMicroelectronics |
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AN2744 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 56 page  Board description AN2744 20/56 5.1 Line coupling interface The line coupling interface is composed of three different filters: the dual channel Tx passive filter, the dual channel Rx passive filter and the dual channel Rx active filter. The coupling interface structure is represented in Figure 9. All three filters are described in Section 5.1.2, Section 5.1.3 and Section 5.1.3. For each filter, calculations and measured frequency responses are given. The filters are quite sensitive to the components' value tolerance. Actual components used in the ST7538Q dual channel reference design have the following tolerances: ● +/- 10% for coils and for the X2 capacitor ● +/- 1% for SMD resistors ● +/- 5% for SMD ceramic capacitors To evaluate sensitivity to the tolerances indicated above, the following sections include simulated responses of the filters with Montecarlo statistical analysis. Statistical simulation helps to understand the relationship between tolerance of components' value and variations Figure 9. Schematic of Rx and Tx filters Tx PASSIVE FILTER Rx PASSIVE FILTER Rx ACTIVE FILTER CMINUS 5V C15 100nF COUT R15 5K1 R14 5K1 ACT_IN CPLUS ATOP1 ATOP2 ACT_IN CH2 P N 1 Q2 2N7002 CH2 R8 330 RAI 2 JP2 CLOSE 2-3 NEG_CH2 JP1 LEAVE OPENED U2 LCA710 R17 1M L5 100 uH R10 100K C11 270pF R13 5K1 R9 1K2 R12 680 C12 270pF 1 Q4 2N7002 R16 1M 3 1 2 D7 ESDA6V1L 3 1 JP3 CLOSE 2-3 C16 4.7nF C20 10nF L7 330uH R18 330 C29 150 nF D6 SM6T6V8CA 1 8 4 5 T2 LINE TRANSFORMER C28 100nF X2 L6 68 uH C27 56 nF R21 3.3 C14 10 nF Tx PASSIVE FILTER Rx PASSIVE FILTER Rx ACTIVE FILTER CMINUS 5V C15 100nF COUT R15 5K1 R14 5K1 ACT_IN CPLUS ATOP1 ATOP2 ACT_IN CH2 P N 1 Q2 2N7002 CMINUS 5V C15 100nF COUT R15 5K1 R14 5K1 ACT_IN CPLUS ATOP1 ATOP2 ACT_IN CH2 P N 1 Q2 2N7002 CH2 R8 330 RAI 2 JP2 CLOSE 2-3 NEG_CH2 JP1 LEAVE OPENED U2 LCA710 R17 1M L5 100 uH R10 100K C11 270pF R13 5K1 R9 1K2 R12 680 C12 270pF 1 CH2 R8 330 RAI 2 JP2 CLOSE 2-3 NEG_CH2 JP1 LEAVE OPENED U2 LCA710 R17 1M L5 100 uH R10 100K C11 270pF R13 5K1 R9 1K2 R12 680 C12 270pF 1 Q4 2N7002 R16 1M 3 1 2 D7 ESDA6V1L 3 1 JP3 CLOSE 2-3 C16 4.7nF C20 10nF L7 330uH R18 330 C29 150 nF D6 SM6T6V8CA 1 8 4 5 T2 LINE TRANSFORMER C28 100nF X2 L6 68 uH C27 56 nF R21 3.3 C14 10 nF |
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