An analog-to-digital converter circuit comprising: voltage control means (1, 391) configured to control a voltage applied to each of a plurality of output lines, wherein the voltage control means comprises a Successive Approximation Register, SAR; comparing means (9, 390) connected to a first common line (6, 360) and a second common line (12, 361) and configured to receive a first signal from the first common line, and to receive a second signal from the second common line, wherein the comparing means is further configured to compare the first signal with the second signal, and to send a resulting comparative signal to the voltage control means; first input means (3, 310) configured to receive a first input voltage; first Digital-to-Analog Converter, DAC, means comprising an output and a plurality of inputs, wherein the output is connected to the first common line of the comparing means, and wherein the plurality of inputs is configured to be controlled by a first plurality of output lines of the voltage control means; first switching means (7, 370) configured to keep the first input means connected to the first common line of the comparing means during a sampling phase, and to keep the first analog input means disconnected from the first common line of the comparing means during a conversion phase which follows the sampling phase; second Digital-to-Analog Converter, DAC means comprising an output and a plurality of inputs, wherein the output is connected to the second common line of the comparing means, and the plurality of inputs is configured to be controlled by a second plurality of the output lines of the voltage control means during the conversion phase; second switching means (13, 373) configured to keep connected the first input means to the plurality of inputs of the second DAC and to keep the plurality of output lines of the voltage control means disconnected from the plurality of inputs of the second DAC during the sampling phase, and to keep the plurality of output lines of the voltage control means connected to the plurality of inputs of the second DAC and to keep disconnected the first input means from the plurality of inputs of the second DAC during the conversion phase which follows the sampling phase; third switching means (15, 371) configured to keep a second voltage input connected to the second common line of the comparing means during the sampling phase and to keep the second voltage input disconnected from the second common line of the comparing means during the conversion phase which follows the sampling phase; wherein the voltage control means is further configured to change the voltage values applied to the plurality of the output lines based on the resulting comparative signal received from the comparing means. voltage control means (1, 391) configured to control a voltage applied to each of a plurality of output lines, wherein the voltage control means comprises a Successive Approximation Register, SAR; comparing means (9, 390) connected to a first common line (6, 360) and a second common line (12, 361) and configured to receive a first signal from the first common line, and to receive a second signal from the second common line, wherein the comparing means is further configured to compare the first signal with the second signal, and to send a resulting comparative signal to the voltage control means; first input means (3, 310) configured to receive a first input voltage; first Digital-to-Analog Converter, DAC, means comprising an output and a plurality of inputs, wherein the output is connected to the first common line of the comparing means, and wherein the plurality of inputs is configured to be controlled by a first plurality of output lines of the voltage control means; first switching means (7, 370) configured to keep the first input means connected to the first common line of the comparing means during a sampling phase, and to keep the first analog input means disconnected from the first common line of the comparing means during a conversion phase which follows the sampling phase; second Digital-to-Analog Converter, DAC means comprising an output and a plurality of inputs, wherein the output is connected to the second common line of the comparing means, and the plurality of inputs is configured to be controlled by a second plurality of the output lines of the voltage control means during the conversion phase; second switching means (13, 373) configured to keep connected the first input means to the plurality of inputs of the second DAC and to keep the plurality of output lines of the voltage control means disconnected from the plurality of inputs of the second DAC during the sampling phase, and to keep the plurality of output lines of the voltage control means connected to the plurality of inputs of the second DAC and to keep disconnected the first input means from the plurality of inputs of the second DAC during the conversion phase which follows the sampling phase; third switching means (15, 371) configured to keep a second voltage input connected to the second common line of the comparing means during the sampling phase and to keep the second voltage input disconnected from the second common line of the comparing means during the conversion phase which follows the sampling phase; wherein the voltage control means is further configured to change the voltage values applied to the plurality of the output lines based on the resulting comparative signal received from the comparing means.