bstract： This reference design enables a complete solution for powering Xilinx? Virtex?-6 FPGA GTX transceivers and Spartan?-6 FPGA GTP transceivers using Maxim‘s power-supply solutions.

　　This fully tested reference design provides a complete solution for powering Xilinx Virtex-6 field-programmable gate array （FPGA） GTX transceivers （on the Xilinx ML623 board） and Spartan-6 FPGA GTP transceivers （on the Xilinx SP623 board） using Maxim’s power-supply solutions. The GTX and GTP transceivers require two distinct power-supply rails each as follows：

　　Design Description—Virtex-6 FPGA GTX Transceiver

　　Power RailInput Voltage （V）Output Voltage （V）Current （A）Maxim Solution

　　MGTAVCC121.02510MAX8686

　　MGTAVTT121.26MAX8686

　　Design Description—Spartan-6 FPGA GTP Transceiver

　　Power RailInput Voltage （V）Output Voltage （V）Current （A）Maxim Solution

　　MGTAVCC121.210MAX8686

　　MGTAVTT121.26MAX8686

　　These reference designs provide the required two power rails using four MAX8686 monolithic synchronous step-down converters. The GTX and GTP transceiver power-supply block diagrams are shown in Figure 1 and Figure 2.