The DIRC Front-end electronics chain for BaBar.

Recent results from the Front-End electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment at SLAG (Stanford , USA) are presented. It measures to better than Ins the arrival time of Ce renkov photoelectrons detected in a 11,000 phototubes array and their ampli tude spectra. It mainly comprises 64-channel DIRC Front-End Boards (DFB) eq uipped with eight full-custom analog chips performing zero-cross discrimina tion with 2 mV threshold and pulse shaping, four full-custom digital time t o digital chips (TDC) for timing measurements with 500 ps binning and a rea dout logic selecting hits in the trigger window, and DIRC Crate Controller cards (DCC) serializing the data collected from up to 16 DFBs onto a 1.2 Gb /s optical link. Extensive test results of the pre-production chips will be presented, as well as system tests.