CERN Accelerating science

ATLAS Note
Report number	ATL-TILECAL-PUB-2007-007 ; ATL-COM-TILECAL-2007-018
Title	The ATLAS tile calorimeter digitizer
Author(s)	Berglund, C (Stockholm U.) ; Bohm, C (Stockholm U.) ; Engström, M (Stockholm U.) ; Eriksson, D (Stockholm U.) ; Holmgren, S O (Stockholm U.) ; Jon-And, K (Stockholm U.) ; Lesser, J (Stockholm U.) ; Selldén, B (Stockholm U.) ; Ramstedt, S (Stockholm U.) ; Silverstein, S (Stockholm U.) ; Sjölin, J (Stockholm U.)
Publication	2008
Imprint	29 Nov 2007
Number of pages	6
In:	JINST 3 (2008) P01004
DOI	10.1088/1748-0221/3/01/P01004
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	digitizer ; calorimeter ; TileCal
Abstract	The ATLAS Tile Calorimeter digitizer system samples photomultiplier signals from the scintillating tiles of the hadronic calorimeter. For each channel a pair of 10-bit ADCs digitize high and low gain signals at 40.08 MHz to provide the necessary 16-bit dynamic range. The sampled data is temporarily stored in digital pipelines for up to 6.375 \mu­s, awaiting a level-1 accept. For each accept received, the corresponding sampled pulse is transferred to a derandomizer buffer for subsequent readout to the data acquisition system (DAQ). The main functionality of the digitizer is implemented in radiation tolerant ASICs, using a fault tolerant architecture to minimize the consequences of radiation induced faults.
Copyright/License	Publication: (License: CC-BY-3.0)

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