ASIC

The front end chips (ASICS) are called the ABCD3T. They have an analogue front-end, a comparitor which produces a binary hit/no-hit and digital pipeline and compression.

See http://chipinfo.web.cern.ch/chipinfo/ ABCD3T ASIC project specification, version 1.2.

Alternative location: http://scipp.ucsc.edu/groups/atlas/elect-doc/abcd3t_spec.pdf