POWER LINE COMMUNICATION MODEM CIRCUIT

Here is a complete ASK modem dedicated to data transmission on power line
network, requiring very few external components. It could be also used on any two-wire
network for exchanging information by means of ASK carrier current technique (DC or
AC network). TDA5051A is used here as the main element for Power line communication modem.

The coupling network is the interface between the power line and the low voltage
TX_OUT and RX_IN pins of the modem. For low cost applications, when the insulation
with the mains is not required, a double LC network can be used, providing efficiency
without any adjustment or tunable components. When an insulation is mandatory, an
HF transformer should be used.

More detail about the circuit theory and PCB layout is given in the PDF attachment

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