The purpose of this application note is to inform the system designer how to use the HI7190 with a multiplexer. This will enable the designer to perform a high precision 24-bit analog to digital conversion using one sigma delta converter with four fully differential inputs which are individually selectable. Each channel may have a unique gain and filter response as defined by the HI7190 Control Register (CR). Refer to [1] for a complete HI7190 description.