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The paper describes a SIMULINK® model for the complete time-domain behavioral simulation of A to D converter. In general standard CAD models are lacking in utility, since they do not model all the sources of errors. In this paper, the main parameters which affect the operations of this device are investigated and the relative non-idealities effects are modeled. The black-box description can be used to emulate, during the system level design of the receiver, a generic converter starting from data sheet parameters, measurements or simulations results without interesting the internal circuital structure of the composing blocks. The model has been tested showing that the simulations results are consistent with circuit measurements of converter used as example.