The first option consists of an optical link using a TOSLINK fiber-optic transmitting module. A typical offering is the
TOSHIBA TOTX173 module for PCB mounted applications. This module can drive fiber optic cables up to 10 meters long, depending
on the cable hardware used. This solution offers compatibility with state of the art audio systems and provides excellent
common-mode rejection and noise immunity. R1 sets the current level for the internal LED and R2 allows the SPDIF transmitter to
be enabled at power-up. Note that the TOSLINK module requires VCC = 5 V (PC logic supply).
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