Abstract

It was necessary to know the voltage and current requirements for the ROACH board, with and without the ADC and DAC boards installed.

Why

These tests aid in the determination of the power supply requirements for the readout electronics. Also, they help to establish the actual pinouts of the computer motherboard standardized ATX12V power supply connector, which was used in the ROACH board design.

How

Dave and Ran measured the voltages and currents required to operate the ROACH board, with and without the ADC and DAC boards attached. A test cable was made to measure the currents while the ROACH board was running, along with the option to confirm the voltage levels. The miniature switching power supply, picoPSU-160-XT, which plugs into the ATX12V connector on the ROACH board, was installed, to determine its possibility as a solution to providing power for the 16 ROACH boards needed in the readout electronics.
Power_Supply_Information_for_ROACH_board.pdf