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Technology and Instrumentation in Particle Physics 2011 (TIPP 2011), Chicago : États-Unis (2011)
SPACIROC: A Front-End Readout ASIC for JEM-EUSO cosmic ray observatory
S. Ahmad1, P. Barrillon1, S. Blin-Bondil1, S. Dagoret-Campagne1, C. de La Taille1, F. Dulucq1, G. Martin-Chassard1, Y. Kawasaki, H. Miyamoto, H. Ikeda, T. Iguchi, F. Kajino

The SPACIROC ASIC is designed for the JEM-EUSO fluorescence imaging telescope onboard of the International Space Station. Its goal is the detection of Giant Air Shower above a few 10^19 eV, developing at a distance of about 400 km, downward in the troposphere. From such distance, most of the time, the number of the photons expected in the pixels is very weak, ranging from a few units to a few tens. For such running conditions, we propose a low- power, rad-hard ASIC which is intended for reading out a 64-channel Multi-Anode Photomultiplier. The two main features of this ASIC are the photon counting mode for each input and the charge-to-time (Q-to-T) conversions for the multiplexed channels. In the photon counting mode, the 100% triggering efficiency is achieved for 50fC input charges. For the Q-to-T converter, the ASIC requires a minimum input of 2pC. The working conditions of JEM- EUSO require the ASIC to have a low power dissipation which is around 1mW/channel. The design of SPACIROC and the test results are presented in this paper. SPACIROC is a result of the collaboration between OMEGAOrsay, France, RIKEN, ISAS/JAXA and Konan University, Japan on behalf of the JEM-EUSO consortium.
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
Sciences de l'ingénieur/Micro et nanotechnologies/Microélectronique
ASIC – Front-End Electronics – Rad-Hard