A/D conversion device provided with a gain calibration arrangement

摘要

An A/D conversion device includes: an amplifier AMP receiving an input voltage V1 and supplying an output voltage V2, and an A/D converter ADC2 intended to convert the output voltage V2 of the amplifier AMP into a digital signal by comparing it with reference voltages generated by a resistance ladder R2 traversed by a bias current. The device includes a multiplexer MUX for setting the input of the amplifier AMP at a reference potential when a calibration signal CALG is active, and a calibration arrangement DECM which compares the output of the second converter ADC2 with a predetermined binary word, supplies a control signal GC, which depends on the result of said comparison and determines the value of the bias current, and stores the control signal GC when the calibration signal CALG is inactive.