Carrier-current systems use the power mains to transfer informationbetween remote locations. This bipolar carriercurrentchip performs as a power line interface for half-duplex(bi-directional) communication of serial bit streams ofvirtually any coding. In transmission, a sinusoidal carrier isFSK modulated and impressed on most any power line via arugged on-chip driver. In reception, a PLL-based demodulatorand impulse noise filter combine to give maximum range.A complete system may consist of the LM1893, a COPSTMcontroller, and discrete components.
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