WHDG18110G Single Port DIP Gigabit Base-T PIN18 non-PoE LAN Transformer
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Evaluate the formula at the frequency you actually care about; do not carry a low-band figure across the whole range.The WHDG18110G specifies insertion loss in two segments: -1.2 dB max from 0.5 to 1 MHz, and -0.2-0.002×f^1.4 dB max from 1 to 125 MHz with f in MHz.
That form means the permitted loss grows with frequency, so link margin is tightest at the top of the band. Return loss is segmented the same way: -16 dB min from 1 to 40 MHz, and -10+20×log(f/80) dB min from 40.1 to 100 MHz. For worst-case analysis, take the value at the highest operating frequency of the target link.
Indoor Gigabit data ports with a component temperature between 0 °C and +70 °C, particularly designs whose link budget has to be worked out frequency by frequency.The WHDG18110G is an 18-pin DIP single-port 100/1000 BASE-T transformer without PoE, so the port needs local power.
Because its insertion and return loss are given as formulas rather than fixed limits, a designer can compute the permitted loss at each frequency of interest, which suits links where margin is tight enough to need that resolution. Other options are in the10/100/1000 BASE-T range.
No. The datasheet assigns no DC balance current capability to the centre taps of the WHDG18110G, so they cannot be used as a supply path.Terminate them according to the reference design for the target PHY.
