Principle of Operation

Model 78861 consists of a Pentek Model 71861 XMC module mounted on a Pentek Model 7807 XMC PCIe carrier, assembled and tested as a single board. It includes four 200−MHz A/D converters, four digital downconverters, and a Xilinx Kintex UltraScale FPGA. Using the PCI Express x8 add−in card format, it is ready to plug into computer boards with PCIe bus slots.

The Model 71861 XMC features a Xilinx Kintex UltraScale FPGA for signal interfaces and processing. The FPGA is pre−configured by Pentek to provide signal acquisition buffering functions. The FPGA also provides board interfaces including PCIe and XMC. Custom general purpose I/O connections are provided to the FPGA through the optional PMC P14 connector (Option 104). Custom gigabit serial interfaces may be implemented through the optional XMC P16 connector (Option 105).

Four 200−MHz, 16−bit A/D converters on the 71861 provide data to the FPGA, where the data can be formatted, processed, or routed to board resources, including four multiband digital downconverters.

The 71861 XMC includes an onboard voltage−controlled crystal oscillator (VCXO) and a programmable clock synthesizer for clocking, but can also accept external clocks through front panel connectors. The 71861 is equipped with an front panel sync bus that allows synchronizing A/D processing on multiple boards.

The 71861 XMC includes five gigabytes of DDR4 (Double Data Rate 4th Generation) SDRAM. This memory is controlled by the FPGA and is available as a memory resource for custom FPGA applications.

The Model 7807 PCIe carrier provides one x8 full−duplex PCIe port, allowing high−speed 71861 data transfer to and from the baseboard PCIe bus using the XMC P15 connector.

• The optional PMC P14 connector (Option 104) provides an LVDS (Low−Voltage Differential Signaling) data path to a GPIO connector on the 7807 carrier PCB.
• The optional XMC P16 connector (Option 105) provides two x4 gigabit serial I/O ports to support Xilinx Aurora, Serial RapidIO, or PCIe interfaces. Two Samtec FireFly™ serial PCB connectors (SER RX, SER TX) are included on the 7807 Carrier, providing access to both P16 x4 gigabit serial paths from the XMC module. Model 78861 Option 110 provides an optical interface to these FireFly serial connectors.