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ICS85411AMIT Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS85411AMIT Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 16 page IDT™ / ICS™ DIFFERENTIAL-TO-LVDS FANOUT BUFFER 8 ICS85411AMI REV. B NOVEMBER 7, 2007 ICS85411I LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVDS FANOUT BUFFER 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 RECOMMENDATIONS FOR UNUSED OUTPUT PINS OUTPUTS: LVDS All unused LVDS output pairs can be either left floating or terminated with 100 Ω across. If they are left floating, there should be no trace attached. |
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