The use of sigma-delta-ADC in the commutation mode

Analog-to-digital converters (ADC) in switching mode are used to convert the signals from multiple sources of the ADC means. It was considered appropriate, since it was believed that this provides a significant simplification of the hardware. Today, the advantage of hardware saving is negligible in compare with the loss of measurement accuracy because of the use of switching mode, which is unreasonably high. ADC developers still offer switching mode, include it in the realization of the circuit performance and recommends it in the user hides. This paper describes carried out comparative study of the ADC in switching mode and this without switching. This study is done with VisSim program simulation. To simulate the operating principle sigma-delta-ADC were used because such ADC are becoming more widespread due to their low cost, high accuracy and speed, sufficient for many practical cases. The simulation results substantiate the reason of non-switched regime. If, however, switching is inevitable, the paper provides recommendations to reduce the error generated by the switching.