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ICS85408BGLF Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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ICS85408BGLF Datasheet(HTML) 7 Page - Integrated Circuit Systems |
7 / 12 page 85408BG www.icst.com/products/hiperclocks.html REV. A APRIL 25, 2005 7 Integrated Circuit Systems, Inc. ICS85408 LOW SKEW, 1-TO-8 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP APPLICATION INFORMATION Figure 1 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = V DD/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 FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS 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 V DD = 3.3V, V_REF should be 1.25V and R2/R1 = 0.609. V_REF R1 1K C1 0.1u R2 1K Single Ended Clock Input CLK nCLK VDD LVDS DRIVER TERMINATION A general LVDS interface is shown in Figure 2. In a 100 Ω differ- ential transmission line environment, LVDS drivers require a matched load termination of 100 Ω across near the receiver in- put. For a multiple LVDS outputs buffer, if only partial outputs are used, it is recommended to terminate the un-used outputs. FIGURE 2. TYPICAL LVDS DRIVER TERMINATION 3.3V 3.3V LVDS_DRIVER R1 100 HiPerClockS Zo = 50 Ohm Zo = 50 Ohm nCLK CLK |
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