The 75 ohm maximum on-resistance sets the series impedance the signal sees through the switch. The 8 ohm channel-to-channel matching keeps gain errors consistent across the two channels.
Dual-supply range and charge injection
The ±4.5 V to ±20 V dual-supply range covers the common analog rails found in test equipment, data acquisition, and industrial control boards. The 10 pC charge injection is the amount of charge dumped onto the load when the switch turns off.
