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AN2744 датащи(PDF) 14 Page - STMicroelectronics |
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AN2744 датащи(HTML) 14 Page - STMicroelectronics |
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14 / 56 page ![]() Board description AN2744 14/56 5 Board description The ST7538Q dual channel reference design is composed of the following sections: – power supply section, based on ST’s VIPer12A-E IC – ST7538Q modem and crystal oscillator section – line coupling interface section, with three subsections: – dual channel transmission passive filter – dual channel reception passive filter – dual channel reception active filter The board has also two connectors, which allow the user to plug the mains supply on one side of the board and the IBU communication board on the other side. The schematics of the whole reference design are given in the following pages. Figure 7 shows the modem and coupling interface circuits, while Figure 8 represents the power supply circuit. In both schematics, high voltage regions are highlighted. Table 3 lists the components used to develop the reference design board. All parts have been selected to give optimal performances. The layout of the printed circuit is shown in Appendix A - Figure 50 and Figure 51. Figure 6. Scheme of the various sections of the board ST7538Q Modem Section ST7538Q ST7538Q Modem Modem Section Section Dual Channel TX Passive Filter Dual Channel Dual Channel TX Passive TX Passive Filter Filter Dual Channel RX Passive Filter Dual Channel Dual Channel RX Passive Filter RX Passive Filter Dual Channel RX Active Filter Dual Channel Dual Channel RX Active Filter RX Active Filter Power Supply (with ST Viper 12A) Power Supply Power Supply (with ST Viper 12A) (with ST Viper 12A) ST7538Q Modem Section ST7538Q ST7538Q Modem Modem Section Section Dual Channel TX Passive Filter Dual Channel Dual Channel TX Passive TX Passive Filter Filter Dual Channel RX Passive Filter Dual Channel Dual Channel RX Passive Filter RX Passive Filter Dual Channel RX Active Filter Dual Channel Dual Channel RX Active Filter RX Active Filter Power Supply (with ST Viper 12A) Power Supply Power Supply (with ST Viper 12A) (with ST Viper 12A) |
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