P o S(TIPP2014)183 The TDCPix ASIC: Tracking for the NA62

The TDCPix is a hybrid pixel detector readout ASIC designed for the NA62 GigaTracker detec-tor. The asynchronously operating pixel array consists of 1800 pixels, each 300x300 µm2. The requirements are a single-hit timing resolution better than 200 ps RMS and a read-out efficiency of 99 % or better in the presence of a beam rate between 800MHz and 1GHz. The discrimina-tor time walk effect is compensated by time-over-threshold discriminators connected to an array of 360 dual TDC channels. The TDCpix processes up to 210Mhits/s and provides the hit data without the need of a trigger in a continuous data stream via four 3.2Gb/s serialisers. Under test since January 2014, the TDCPix chip is fully functional and shows excellent performance