#92: CD4066BE (Analogue Switch, Quad Channel, SPST, 4 Channels, 240 ohm, 3V to 18V)

R13.20

The CD4066BE is a CMOS quad bilateral switch in 14 pin DIP package. This switch is intended for transmission or multiplexing of analogue or digital signals. It is pin to pin compatible with CD4016B but exhibits much lower on state resistance. The on state resistance is relatively constant over full input signal range. The CD4066B consists of four bilateral switches with independent controls. Both P and N device in given switch are biased on or off simultaneously by control signal. The advantages over single channel switches include peak input signal voltage swings equal to full supply voltage and more constant on state impedance over input signal range.

The CD4066B device is a quad bilateral switch intended for the transmission or multiplexing of analog or digital signals. It is pin-for-pin compatible with the CD4016B device, but exhibits a much lower on-state resistance. In addition, the on-state resistance is relatively constant over the full signal-input range.

The CD4066B device consists of four bilateral switches, each with independent controls. Both the p and the n devices in a given switch are biased on or off simultaneously by the control signal. As shown in Figure 17, the well of the n-channel device on each switch is tied to either the input (when the switch is on) or to V_SS (when the switch is off). This configuration eliminates the variation of the switch-transistor threshold voltage with input signal and, thus, keeps the on-state resistance low over the full operating-signal range.

The advantages over single-channel switches include peak input-signal voltage swings equal to the full supply voltage and more constant on-state impedance over the input-signal range. However, for sample-and-hold applications, the CD4016B device is recommended.