LiTE-DTU: Online Data Selection, Compression, and Transmission ASIC for the Upgraded Front-End of the CMS Electromagnetic Calorimeter

The Compact Muon Solenoid (CMS) detector is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and with 25 ns bunch spacing. The High Luminosity LHC (HL-LHC) will require a significant upgrade of the CMS electromagnetic calorimeter (ECAL) in order to maintain good detector performance in the harsh radiation environment, increasing data rates, and higher level of pile-up events of the HL-LHC. The very front-end (VFE) readout electronics have been completely redesigned, with goals of providing precision timing, low noise, and sampling rate four times higher than the current one. This paper focuses on the LiTE-DTU ASIC that is a fully digital data transmission unit which performs online data selection, online lossless compression, and high-speed serial transmission. I will report on the ASIC architecture, the selected methods for data selection and compression, data format, and techniques for mitigation of radiation damage mitigation.