The TMUX7234 can operate without any external components except for the supply decoupling capacitors. All inputs passing through the switch must fall within the recommended operating conditions of the TMUX7234, including signal range and continuous current. Section 5.4 shows how the signal range for this design can be -15 V to +15 V and the maximum continuous current can be up to 400 mA for wide-range current measurement with a positive supply of 15 V on V_DD and negative supply of -15 V on V_SS. The TMUX7234 device are bidirectional, single-pole double-throw (SPDT) switches that offer low on-resistance, low leakage, and low power. These features make these devices suitable for portable and power sensitive applications such as ultrasonic water metering systems. For a more detailed analysis of the ultrasonic water flow measurement system refer to the reference design.