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 power supplies are absent, 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 positive fault voltage (POSFV) or negative fault voltage (NEGFV) by a threshold voltage (VT), the channel turns off and that Sx pin becomes high impedance. If the switch is on, the drain pin is pulled to the secondary supply voltage that was exceeded. Input signal levels up to +55V or −55V relative to the ground are blocked, in both the powered and unpowered condition.
The low capacitance and charge injection of the ADG5248F and ADG5249F switches make them well-suited for data acquisition and sample-and-hold applications, where low glitches and fast settling are required.