SNLS543 August 2018 DS90UH949A-Q1
The SER/DES supports only AC-coupled interconnects through an integrated DC-balanced decoding scheme. External AC-coupling capacitors must be placed in series in the FPD-Link III signal path as shown in Figure 28.
|DESIGN PARAMETER||EXAMPLE VALUE|
|AC Coupling Capacitor for DOUT0± and DOUT1± with 92x deserializers||100 nF|
|AC Coupling Capacitor for DOUT0± and DOUT1± with 94x deserializers||33 nF or 100nF|
For applications using a single-ended, 50-Ω coaxial cable, the unused data pins (DOUT0–, DOUT1–) should use a 15-nF capacitor and should be terminated with a 50-Ω resistor.
For high-speed FPD–Link III transmissions, the smallest available package should be used for the AC-coupling capacitor. This will help minimize degradation of signal quality due to package parasitics.