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The following schematic shows a circuit of differential analog switch uses FM1208 monolitic dual. Although not common, this circuit is an ideal choice for an accurate multiplexer. It is because RDS (on) for the monolithic dual tracks at better than ± 1% over wide temperature ranges (-25 to +125 degree celcius). [Source : National Semiconductor [...]

This is a circuit of differential analog switch. This circuit uses  the FM1208 monolithic dual. Here is the circuit: This circuit is ideal choice for an accurate multiplexer because RDS (on) for the monolithic dual tracks at better than ± 1% over wide temperature ranges (-25 to +125°) although it is unusual. [Source: National Semiconductor [...]