Analog-to-digital conversion device

An analog-to-digital conversion device having a reference voltage and configured to operate within an allowed range of analog input voltage values between 0 V and the reference voltage, the analog-to-digital conversion device comprising:

• an adaptation module configured to adapt a voltage level of an analog input signal to a reference voltage value, wherein the adaptation module includes:
• a first resistor electrically connected to an input and an output of the adaptation module, and
• a second resistor electrically connected to the first resistor and a ground;
• a sample acquisition block configured to acquire successive samples of the adapted analog input signal from the adaptation module, wherein the sample acquisition block includes:
• a switch electrically connected to an input and an output of the sample acquisition block, and
• a capacitor electrically connected to the switch and the ground;
• a variable gain adjuster configured to adjust a level of the adapted input signal with a variable gain based on the samples received from the sample acquisition block;
• an analog-to-digital converter configured to convert the adjusted analog input signal to a digital output signal;
• and
• a classification circuit configured to output a corresponding classification information of the analog input signal based on the level of the analog input signal, wherein:
• the classification information is representative of a sub-range from a plurality of non-intersecting sub-ranges that subdivide the allowed range of analog input voltage values,
• the variable gain adjuster is configured to set a gain value of the variable gain corresponding to the classification information,
• the classification information includes a binary gain code,
• the analog-to-digital converter stores a digital value resulting from the conversion of the analog input signal to a first part of an output register, and
• the classification circuit stores the binary gain code in a second part of the output register.