Introdcution
The CD4066 is a quad bilateral switch which can be applied for switching of analog signals and 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 CD4066 device consists of four bilateral switches, each with independent controls. The switches can be switched off independently and complement each other. 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.
Catalog
I Test Circuit of CD4066
The test of CD4066 quad bilateral switch is mainly to test the control function and bilateral conduction function of each switch.
Figure 1. Test Circuit of CD4066
In Figure 1, selecting high or low level, KI is a SPDT switch at the control terminal, which is used to change the on state of the analog switch. When the switch is turned to H to turn on the high level, the control terminals of the four switches are at high level, and each switch should be turned on. When the switch is turned to L low level, the four switches should be turned off. K2 is a double-pole double-throw switch. Toggle the switch K2 to control the direction of the bilateral flowing switch signal. It is indicated by two groups of red and green LED.
When the switch K2-1 is turned to H high level, K2-2 is connected to L low level. When KI switch is turned to high level state, all switches are in forward (reverse) conduction state. So the positive pole of the power supply is added to the parallel connected light-emitting diodes LFD1, LED3, IED5, positive pole of LED7 and the step-down resistor R. Then the four red LEDs light up. When the Kl switch is turned to L low level, each analog switch is in the cut-off state. No matter K2 is switched to H or L state, the two groups of red and green LED will not light up.
II Cordless Telephone
CD4066 is a quad bilateral switch, which is widely used in TV, DVD player, telephone, various electronic instruments and meters. The CD4066 device consists of four bilateral switches, each with independent controls. The switches can be switched off independently and complement each other. The typical application circuit of CD4066 in cordless telephone is shown in the figure.
Figure 2. Circuit of Cordless Telephone
III Self-locking Touch Switch Circuit
In the self-locking touch switch circuit composed of CD4066b, when the touch switch S1 is activated, R4 is driven to high level, and the control voltage becomes high, which will latch the switch. When S2 is activated, R4 becomes low and the control voltage becomes low, which will deactivate the switch.
Figure 3. Self-locking Touch Switch Circuit
IV Electronic Switch Circuit
Electronic switch circuit composed of CD4017 and CD4066 is shown below.
Figure 4. Electronic Switch Circuit
FAQ
The CD4066 is a Quad Bilateral Switch IC, that is, it has four switches which can be controlled individual using a control pin. These switches can conduct in both the directions making it bilateral, it is commonly used for multiplexing analog or digital signals.
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The CD4066 IC consists of four switches. It can switch analog signals through digital control. An analog signal is applied at the input of the switch. If a HIGH or 1 value is fed into the control input, the analog signal will be passed from input to the output of a switch.
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The 4066 really functions as an analog switch. The 4066 is an IC composed of switches which are designed to switch analog signals via digital control. ... The 4066 is a quad bilateral switch circuit, meaning that is composed of 4 switches. Each switch has a single input and a single output terminal.
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- What are the applications of CD4066?
The CD4066 is a bi-directional analog switching IC similar to CD4016, it is commonly used in multiplexing applications; it can also be used to isolate signals. The switch is bilateral and hence can be used for both digital and analog signals.
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- What's the difference between CD4016 and CD4066?
The major difference between both is that CD4066 has very low internal resistance, according to the datasheet it can only 5Ω of on-state resistance as compared with 200Ω of CD4016 IC.
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