Care has been taken to ensure a good ground plane for the return of the calibration signal and to minimisze cross-talk. The boards are now in production. The status of the design and production of the summing boards and of the mother boards of the barrel is given. Production for module 0 should be completed by the end of this year. Even if not extreme, these levels of radiations are to be taken seriously.
Performance depends critically from the manufacturer.
Tests are mandatory. Delays can be programmed by 1 ns steps. The chips has 4 independent channels and uses a 40 MHz clock as timing reference. It can be programmed using the I2C standard. The differential linearity has a rms of 26 ps and the present integral non linearity is below 300 ps.