Device for optimising the operating range of an A/D converter.

摘要

A device comprises a radiation source powered by a power-supply source, an optical system for projecting the radiation produced by the radiation source onto at least one radiation-sensitive semiconductor via an information carrier, and for each radiation-sensitive semiconductor an A/D converter intended to convert, during operation, an analog signal proportional to the detected radiation intensity into a digital signal. During operation the input signal range and the conversion range of each A/D converter are adapted to one another in such a manner that in the case of a maximum analog signal on the input of the A/D converter at least approximately the maximum digital value appears on the output of the A/D converter. These means are controlled by an indication signal which is generated if the analog signal has a value exceeding the maximum value which can be converted by the A/D converter.