Accuracy considerations in process control

摘要

The majority of process control applications require digital results that are accurate to one part in 4096. As the output of a 12-bit A/D converter matches this exactly, why do these applications use converters with a higher number of bits? It is important not to be pre-occu-pied with the number of digital codes or the full-scale input range of the converter, but instead to look at the system accuracy requirements or analogue voltage least significant bit (LSB) size.