ICS85408I Datasheet, PDF(9/16 Page) Integrated Device Technology – Low Skew, 1-to-8, Differential-to-LVDS Clock

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ICS85408I Datasheet, PDF (9/16 Pages) Integrated Device Technology – Low Skew, 1-to-8, Differential-to-LVDS Clock

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ICS85408I Datasheet

LOW SKEW, 1-TO-8, DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP

Application Information

Wiring the Differential Input to Accept Single-Ended Levels

Figure 1 shows how the differential input can be wired to accept

single-ended levels. The reference voltage V_REF = VDD/2 is

generated by the bias resistors R1, R2 and C1. This bias circuit

should be located as close as possible to the input pin. The ratio of

R1 and R2 might need to be adjusted to position the V_REF in the

center of the input voltage swing. For example, if the input clock swing

is only 2.5V and VDD = 3.3V, V_REF should be 1.25V and R2/R1 =

0.609.

Single Ended Clock Input

V_REF

0.1u

VDD

CLK

nCLK

Figure 1. Single-Ended Signal Driving Differential Input

Recommendations for Unused Output Pins

Outputs:

LVDS Outputs

All unused LVDS output pairs can be either left floating or terminated

with 100â¦ across. If they are left floating, there should be no trace

attached.

ICS85408BGI REVISION B JULY 2, 2009

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