SBOS531E August 2010 – June 2019 AFE031
The line-coupling circuit is one of the most critical circuits in a powerline modem. The line-coupling circuit has two primary functions: first, to block the low-frequency signal of the mains (commonly 50 Hz or 60 Hz) from damaging the low-voltage modem circuitry; second, to couple the modem signal to and from the ac mains. A typical line-coupling circuit is shown in Figure 49.
For additional information on line-coupling interfaces with the AFE031, refer to Application Report SBOA130, Analog Front-End Design for a Narrowband Power-Line Communications Modem Using the AFE031, available for download at www.ti.com.