The multiplexer selection also effects the accuracy of temperature measurement. The key specifications and features are on resistance(R_ON), on capacitance(C_ON) and on and offleakage current(I_ON,I_OFF). The on resistance contributes to signal loss and degradation, low R_ON tradeoffs must be considered. Total on capacitance also must be considered because this can affect response time, settling time and fanout limits. Leakage current contribute to DC errors both when the switch is ON and when the switch is OFF, but only the on leakage current introduces error in the Figure 3-1 configuration.

The user can select precision multiplexers to minimize the errors and signal distortion from multiplexers. For example, TMUX1109, a 2-channel precision multiplexer with a typical 2.5? R_ON, 35pF C_ON and 3nA I_ON can be used as an alternative to the SN74LV4052A.