ICS844071

FEMTOCLOCK™CRYSTAL-TO-LVDS CLOCK GENERATOR

IDT™ / ICS™ LVDS CLOCK GENERATOR

10

ICS844071AG SEPTEMBER 26, 2007

3.3V, 2.5V LVDS Driver Termination

A general LVDS interface is shown in Figure 4. In a 100

Ω

differential transmission line environment, LVDS drivers require a

matched load termination of 100

Ω across near the receiver input.

For a multiple LVDS outputs buffer, if only partial outputs are used,

it is recommended to terminate the unused outputs.

Figure 4. Tyical LVDS Driver Termination

LVDS Driver

R1

100

Ω

–

+

50

Ω

50

Ω

3.3V or 2.5V

V

DD

100

Ω Differential Transmission Line