ST7540 FSK powerline transceiver design guide for AMR
description . . . . . . . . . . . . . . . . . . 104Evaluation tools description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135.1Coupling interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185.1.1Tx active filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.1.2Tx passive filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.1.3Rx passive filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.1.4Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245.2Conducted disturbances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255.2.1Conducted emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . features, in particular, its The ST7540 reference design may be considered to be composed of three main sections:Power supply section, specifically tailored to match powerline coupling requirements and to operate within a wide range of the input mains voltageModem and crystal oscillator sectionLine coupling interface sectionThe coupling interface is designed to allow the ST7540 FSK transceiver to transmit and receive on the mains using 72 kHz carrier frequencies, within the European CENELEC standard A-band specified for automatic meter reading. Figure 1.ST7540 reference design board with outline dimensionsAs it can be seen from the picture above, a special effort has been made to obtain a very compact reference design board, while keeping the focus on transmission and receiving performances. Note:The information provided in this application note refers to EVALST7540-1 reference design board. 52 mm76 mmwww.st.comContentsAN24512/55 Contents1Electrical characteristics . . . . . . . . . . specifications. . . . . . . . . . . . . . . .
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Relevant Keywords:
EVALCOMMBOARD3, V265, EVALCOMMBOARD2, ST7540, BER10, HTSSOP28, 93ST7540, EVALST7540-1, 49AN2451, V5ST7540
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