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AN2744 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2744 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 56 page  April 2008 Rev 1 1/56 56 AN2744 Application note ST7538Q power line FSK transceiver dual channel reference design for AMR Introduction The ST7538Q dual channel reference design is a practical tool to start the activity of designing an automatic meter reading (AMR) node based on the ST7538Q power line FSK transceiver. With this reference design, it is possible to evaluate the features of the ST7538Q and its transmitting and receiving performances in an actual communication on the power line network. The ST7538Q reference design can be considered as composed of three main sections: ■ power supply section, specifically designed to coexist with power line communication and to operate from a wide-range input mains voltage ■ modem and crystal oscillator section ■ dual channel line coupling interface section The dual channel line coupling interface allows the ST7538Q FSK transceiver to transmit and receive on the mains using two different carrier frequencies: 72 kHz and 86 kHz, both within the frequency band A specified by the European CENELEC EN50065 standard for AMR applications. Figure 1. ST7538Q dual channel reference design board with outline dimensions As it can be seen from the picture above, a special effort has been made to develop a compact reference design board, oriented to practical applications. Note: The information provided in this application note refers to the EVALST7538DUAL reference design board. 98mm www.st.com |
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