In most wireless applications there is a need for low current draw, and one of the features implemented in the CC112X (CC1120, CC1121, CC1125) to facilitate this, is to terminate RX if there is no carrier on the air. The time it takes before RX is terminated varies based on different settings, which will be discussed further in this design note. This application note shows how the CS response time differs with various radio settings. Low CS response times can help reduce power consumption.