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AN1301 APPLICATION NOTE

Figure 2. Transmit Interface Circuitry

4.2 Receive Termination Circuitry

The receive termination circuit as shown in Figure 3 is a simple 100 ohm, 1% resistor across the RX+/

RX- pair. The receive circuit consists of magnetics, which include a main winding and a common-mode

choke, and termination resistance to match the line impedance. The common-mode choke can be

located on either the primary or secondary side of the winding. Some vendors place the receive com-

mon-mode choke on the line-side (primary) of the main winding while others place it on the device side

(secondary). Either location is acceptable.

Figure 3. Receive Interface Circuitry