Elma 101V64XM05-0621 Backplane with COTS-Tech Chassis and Power Supply

The Elma / Bustronic VME64x Backplane is designed to fully comply with the ANSI/VITA VME extension standard. The backplanes provide all standard features required for VME64x compatibility, including 160-pin VME extension connectors in J1 and J2, all defined ground pins connected to a ground plane, routing and termination of all VME and VME64x bussed signal lines, geographic address pins, distribution of +5V, +3.3V, ±12V, ±V1, ± V2, and VPC, all on a single monolithic printed circuit board with J1 and J2 included. Additional features include active, electronic IACK/BUSGRANT daisy chaining standard; onboard, inboard termination; distributed high frequency capacitors for each slot, distributed low frequency capacitors; five signal layers, five power and ground planes.

Elma / Bustronic constructs the board in ten layers — five signal layers, five power and ground planes. The backplanes incorporate a full stripline design, generously distributed decoupling capacitors, inboard termination, 2 oz. power and ground planes, transient analysis simulation programs.

The standard design features three 2 oz. copper ground planes, which fully shield the backplane, minimize EMI/RFI emissions susceptibility, minimize crosstalk, and maximize power distribution. In addition, the robust outer ground layers provide mechanical and EMI/RFI protection for the backplane.

Two 2 oz. copper VCC planes, allow the backplanes to maximize power distribution while they act as virtual ground planes for the signals in order to minimize noise and crosstalk. The high frequency decoupling capacitors at every slot and distributed low frequency electrolytic capacitors across the board also help this effort. Measured results verify that Elma / Bustronic backplanes are among the quietest in the industry.

The combination of multiple 2 oz. copper layers of VCC and ground, plus the distributed capacitors allows Elma / Bustronic backplanes to provide superior power distribution. Additionally, there are multiple, well-distributed power bugs to virtually eliminate voltage drop across the backplane. There is also a utility connector that allows minimal power insertion and provides access to status signals, including ACFAIL, RESET, and SYSFAIL.