Upgrade for the ATLAS Tile Calorimeter Readout Electronics at the High Luminosity LHC

The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the most central region of the ATLAS experiment at LHC. The TileCal readout consists of about 10000 channels. The main upgrade will occur for the High Luminosity LHC phase (phase 2) which is scheduled around 2022. The upgrade aims at replacing the majority of the on- and off-detector electronics so that all calorimeter signals are directly digitized and sent to the off-detector electronics in the counting room. An ambitious upgrade development program is pursued studying different electronics options. Three options are presently being investigated for the front-end electronic upgrade. The first option is an improved version of the present system built using discrete components, the second alternative is based on the development of a dedicated ASIC, and the third is the development of a new version of the "QIE" based on the Fermilab. Concerning the off-detector electronics a new back-end architecture is being developed, the so-called super Read-Out Driver (sROD). A demonstrator prototype read-out for a slice of the calorimeter with most of the new electronics, but also compatible with the present system, is planned to be inserted in ATLAS already in 2013 to mid 2014 (phase 0)