9.2 Auxiliary Transmission Branch

The Auxiliary Transmission Branch can provide an additional output bit-stream, if required. This PLC signal is driven by means of the EMIT outputs, and controlled by the TXRX1 signal, as described by Figure 9-2. Note that the auxiliary transmission path cannot use the embedded PLC driver in the PL460 and requires an external circuit for signal amplification, in addition to the standard filtering and coupling stages.

The auxiliary PLC transmission branch may be required in case of multi-band applications (for example, FCC+CEN-A).

Figure 9-2. Transmission Path Block Diagram using Auxiliary Branch

EMIT2 and EMIT3 provide a 3.3V PLC signal (not amplified) to the external transmission stage. TXRX1 is used to control the behavior of the external discrete filter in transmission and reception. Refer to Microchip reference designs for detailed descriptions about how to implement the external circuitry required by the auxiliary transmission branch.