DP83848 is a current-mode driver and thus requires a 50OHM resistor connection between each MDI pin and AVDD33. There is also a requirement of a 100nF decoupling capacitor from AVDD33 and GND near the pullup resistors as shown in Figure 3-4. DP83826 is a voltage-mode driver and does not require these extra components as shown in Figure 3-5.

Both PHYs can use the same discrete transformers as both PHYs share the same recommendations regarding electrical specifications. However, DP83826 has a recommended configuration of center tap decoupling caps of 2nF per channel, while DP83848 has a recommended configuration of center tap shorting between channels and pulling up to AVDD33 with a 100nF decoupling cap per channel.

Figure 3-4 DP83848 MDI Network

Figure 3-5 DP83826 MDI Network