Renesas 8V19N850, Руководство пользователя

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8V19N850 Hardware Design Guide
X0120307 Rev.1.0
Mar 25, 2021 Page 14
2.4.2. LVDS Type Driver Terminations
Unlike the LVPECL style driver, the LVDS style driver does not require a board level pull-down resistor.
Figure 15 and Figure 16 show typical termination examples with DC coupling for the LVDS style driver. A
termination example with AC coupling is shown in Figure 17. All three figures are for LVDS receivers with a high-
input impedance (no built-
in 100Ω termination). For receivers with built
-
in 100Ω termination, see the note
below
Figure 17.
Figure 15. LVDS Style Driver Term ination (DC Coupled)
Figure 16. LVDS Style Alternative Driver Term ination (DC Coupled)
Figure 17. LVDS Style Alternative Driver Term ination (AC Coupled)
Note : For receivers with built-
in 100Ω termination that provides
its own DC offset (self-bias), apply the AC-
coupled termination shown in Figure 17 and do not populate the resistors R1, R2, and R3.
Zo = 50
Zo = 50
VDDO_V
LVDS Sty le Driv er
High Impedance Input
+
-
No Built-in Termination
R1
100
C1
0.1uF(optional)
Zo = 50
High Impedance Input
+
-
VDDO_V
R1
50
Zo = 50
No Built-in Termination
LVDS Sty le Driv er
R2
50
No Built-in Termination
R2
10K
VDDO_V
R3
10K
VDD
Zo = 50
C2
High Impedance
+
-
C1
Zo = 50
LVDS Sty le Driv er
R1
100