ATLAS Phase-II-Upgrade Pixel Data Transmission Development

The ATLAS tracking system will be replaced by an all-silicon detector (ITk) in the course of the HL-LHC upgrade around 2025. The readout of the ITk pixel system will be most challenging in terms of data rate. Simulation of the on-detector electronics based on a trigger rate of 1 MHz indicate that a readout speed of up to 5 Gbps per data link is necessary. Due to radiation levels, the first part of transmission is implemented electrically, realised by “active cables” integrating data aggregator and equalizer ASICs. The system layout and updates on simulation and test results will be presented.