TIDUF49 February 2024
There are two main factors to consider when selecting a CDN: Ethernet speed and power consumption of the PD. Table 3-3 shows each Ethernet PHY with the corresponding Ethernet standard and data frequency.
Ethernet PHY | IEEE STANDARD | DATA RATE | SYMBOL RATE |
---|---|---|---|
— | 10Base-T1S | 10Mb/s | 12.5MHz |
DP83TC812-Q1 | 100Base-T1 | 100Mb/s | 66.6MHz |
DP83TC813-Q1 | |||
DP83TC814-Q1 | |||
DP83TG720-Q1 | 1000Base-T1 | 1000Mb/s | 750MHz |
Each PoDL CDN has a maximum current that it can support while maintaining the required impedance based on the saturation characteristics of the components. Inductors do not behave in a flawless manner, the inductors dissipate heat, pass very high frequencies and saturate when too much current is passed through. All components and cables have parasitic capacities and impedances throughout the entire circuit. Knowing the maximum power the PD draws and selecting a CDN solution that can deliver that power for a given PoDL voltage is important. Calculate the maximum power as the worst-case scenario of power consumption on the PD side of the link. Highest power consumption refers to a period where, for example, the radar is chirping and all other remote devices are operating. The user need to select a PoDL network capable of supplying enough current for the PD.
Table 3-4 provides CDN solution suggestions. TI recommends selecting one of the networks based on the desired frequency range, current rating, and temperature.
VENDOR | CDN FILTER SOLUTION |
Ethernet SPEED |
COMPONENTS | CURRENT RATING |
TEMPERATURE RATING |
---|---|---|---|---|---|
TDK | 2 | 100Base-T1 | CMC: ACT1210L-201-2P-TL00 DMI: PID77S-180M |
1350mA | 150°C |
MuRata | 3 | 1000Base-T1 | CMC: DLW32MH101XT2 DMI: LQH32NH3R3J23 |
425mA | 125°C |
TDK | 4 | 1000Base-T1 | CMC: ACT1210G-800-2P-TL10 DMI: ADL32VHR-3R9M |
540mA | 150°C |
TDK | 5 | 1000Base-T1 | CMC: ACT1210G-800-2P-TL10 DMI: ADM70S-2R6 |
1500mA | 150°C |