Texas Instruments HPL-D SLLU064A manual Termination for Interfacing LVDS, CML, or Lvpecl Drivers

2 Setup and Required Equipment

Table 2-1 Crosspoint Function Table

Output Channel 1			Output Channel 2			Output Channel 3			Output Channel 4
Control		Input	Control		Input	Control		Input	Control		Input
Pins		Selected	Pins		Selected	Pins		Selected	Pins		Selected
S10	S11	1Y/1Z	S20	S21	2Y/2Z	S30	S31	3Y/3Z	S40	S41	4Y/4Z
0	0	1A/1B	0	0	1A/1B	0	0	1A/1B	0	0	1A/1B
0	1	2A/2B	0	1	2A/2B	0	1	2A/2B	0	1	2A/2B
1	0	3A/3B	1	0	3A/3B	1	0	3A/3B	1	0	3A/3B
1	1	4A/4B	1	1	4A/4B	1	1	4A/4B	1	1	4A/4B

Apply inputs to the SMA connectors J1–J8. The EVM comes with 50-Ω resistors installed to VTERM, providing a termination scheme easily adjusted to accommodate LVDS, LVPECL, or CML output structures. (See Figure 2-2).

LVDS,

LVPECL,

or CML

Vterm

50Ω

A

SN65LVDS125 Input

Channels 1-4

B

50Ω

Vterm

Figure 2-2. Termination for Interfacing LVDS, CML, or LVPECL Drivers

2-3