The ADG5243F comprises three independently selectable, singlepole/double-throw (SPDT) switches. All channels exhibit breakbefore-make switching action that prevents momentary shorting when switching channels. An EN input enables or disables the device. When disabled, all channels are switched off. Each switch conducts equally well in both directions when on, and each switch has an input signal range that extends to the supplies. The primary supply voltages define the on-resistance profile, whereas the secondary supply voltages define the voltage level at which the overvoltage protection engages.
When no power supplies are present, the channel remains in the off condition, and the switch inputs are high impedance. Under normal operating conditions, if the analog input signal levels on any Sx pin exceed the positive fault voltage (POSFV) or the negative fault voltage (NEGFV) by a threshold voltage (VT), the channel turns off and that Sx pin becomes high impedance. If the switch is selected to be on, then the drain pin is pulled to the secondary supply voltage that was exceeded. Input signal levels up to ?55 V or +55 V relative to ground are blocked, in both the powered and unpowered conditions.