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4066

Quad Analog Switch/Quad Multiplexer

ON Semiconductor 

MC14066B

APPLICATIONS INFORMATION

Figure A illustrates use of the Analog Switch. The 0–

to–5 volt digital control signal is used to directly control a

5 volt peak–to–peak analog signal.

The digital control logic levels are determined by VDD

and VSS. The VDD voltage is the logic high voltage, the VSS

voltage is logic low. For the example, VDD = + 5 V = logic

high at the control inputs; VSS = GND = 0 V = logic low.

The maximum analog signal level is determined by VDD

and VSS. The analog voltage must not swing higher than

VDD or lower than VSS.

The example shows a 5 volt peak–to–peak signal which

allows no margin at either peak. If voltage transients above

VDD and/or below VSS are anticipated on the analog

channels, external diodes (Dx) are recommended as shown

in Figure B. These diodes should be small signal types able

to absorb the maximum anticipated current surges during

clipping.

The absolute maximum potential difference between

VDD and VSS is 18.0 volts. Most parameters are specified up

to 15 volts which is the recommended maximum difference

between VDD and VSS.

+5 V

VDD

VSS

5 Vp-p

SWITCH

ANALOG SIGNAL

IN

SWITCH

5 Vp-p

+5 V

OUT

ANALOG SIGNAL

EXTERNAL

CMOS

DIGITAL

CIRCUITRY

0-TO-5 V DIGITAL

CONTROL SIGNALS

MC14066B

+ā5.0 V

+2.5 V

GND

Figure A. Application Example

VDD

DX

SWITCH

IN

DX

SWITCH

OUT

VDD

DX

DX

VSS

VSS

Figure B. External Germanium or Schottky Clipping Diodes

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