DP83848 utilizes a 3.3V supply for both analog and digital supplies. DP83826A provides an option to have the digital supply at 1.8V for wider compatibility and power savings.

For power supply decoupling, DP83848 requires a 100nF per supply pin and a 10μF capacitor as shown in Figure 3-1 while DP83826A requires a network of 10nF, 100nF, 1μF, and 10μF per supply pin as shown in Figure 3-2.

For special connections required for operation, both PHYs have an RBIAS pin. DP83848 requires a 4.87kΩ while DP83826A requires a 6.49kΩ. DP83848 requires an additional three 100nF and a 10μF decoupling capacitor between PFBIN/PFBOUT (shorted together) pins and GND as shown in Figure 3-3. The LQFP DP83848 also requires a 2.2kΩ from pins 20 and 21 (Reserved) to AVDD33.