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The AD41240 is a custom made 12-bit 40 MSPS, quadchannel, radiation tolerant analog-to-digital converter for the front-end readout electronics of the CMS Electromagnetic Calorimeter (ECAL) and the CMS Preshower detectors. The A/D converter features a special digital circuitry to allow automatic selection of gain ranges when it is used with a multi gain pre-amplifier. This paper describes the design architecture of the A/D converter as well as the characterization methodology that has beendoi:10.5170/cern-2005-011.241 fatcat:xrsc6zrhtzf3lkurdla7arpm2y