Radiation hardness evaluation of the Analog Devices AD9042 ADC for use in the CMS electromagnetic calorimeter

We report on the results of an irradiation study carried out on devices from all wafers in a lot of AD9042 40 MHz 12-bit ADCs. These devices were irradiated in a 72 MeV proton beam in order to simulate the effects in CMS at the LHC. No change in dynamic performance was observed for doses up to 2×104 Gy along with 4×1013 n/cm2. The uniform behavior of all devices in the lot also indicates that radiation hardness can be assured by sampling tests on devices from one wafer in the lot.