System architecture of the Dark Energy Survey Camera readout electronics

The Dark EnergySurvey makes use of a new camera, the Dark EnergyCamera (DECam). DECam will be installed in the Blanco 4M telescope at Cerro Tololo Inter-American Observatory(CTIO). DECam is presently under construction and is expected to be ready for observations in the fall of 2011. The focal plane will make use of 62 2Kx4K and 12 2kx2k fully depleted Charge-Coupled Devices(CCDs) for guiding, alignment and focus. This paper will describe design considerations of the system; including, the entire signal path used to read out the CCDs, the development of a custom crateand backplane, the overall grounding scheme and early results of system tests.