An analog switch can conduct an analog signal such as a sine-wave signal in either direction. It passes a signal when on and blocks it when off.
An analog switch is composed of a pair of n-channel and p-channel MOSFETs connected in parallel in order to reduce on-resistance and improve the linearity of I/O characteristics.
The datasheet for the analog switch shows typical sine-wave distortion, maximum frequency response, feed-through attenuation, crosstalk, and other specifications as analog switch characteristics. The following shows the logic symbol, truth table, timing diagram, and logic schematic of an analog switch.