Analog-to-digital conversion device comprising two cascaded noise-shaping successive approximation register analog-to-digital conversion stages, and related electronic sensor

An analog-to-digital converting device for converting an analog input signal into a digital output signal, comprising:

• an input terminal for receiving the analog input signal;
• an output terminal for issuing the digital output signal;
• a first successive approximation register analog-to-digital conversion module, called first SAR ADC module, connected via its input to the input terminal and configured to deliver via its output a first digital signal;
• a first feedback module configured to receive a first residue signal from the first SAR ADC module and to process and inject it back at input of the first SAR ADC module;
• a second successive approximation register analog-to-digital conversion module, called second SAR ADC module, connected via its input to the first SAR ADC module to receive the first residue signal and configured to deliver via its output a second digital signal;
• a second feedback module configured to receive a second residue signal from the second SAR ADC module and to process and inject it back at input of the second SAR ADC module;
• and
• a multiplexing module connected to the output of the first SAR ADC module and to the output of the second SAR ADC module, the multiplexing module being configured to deliver the digital output signal at the output terminal,
• the first feedback module comprising a first filter for filtering the first residue signal before injecting it back at input of the first SAR ADC module.