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MC14066BDTEL データシート(PDF) 7 Page - ON Semiconductor |
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MC14066BDTEL データシート(HTML) 7 Page - ON Semiconductor |
7 / 12 page MC14066B http://onsemi.com 7 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. Figure A. Application Example +5 V VDD VSS 5 Vp–p ANALOG SIGNAL 0–TO–5 V DIGITAL CONTROL SIGNALS SWITCH IN MC14066B SWITCH OUT 5 Vp–p ANALOG SIGNAL + 5.0 V + 2.5 V GND +5 V EXTERNAL CMOS DIGITAL CIRCUITRY Figure B. External Germanium or Schottky Clipping Diodes VDD VDD VSS VSS DX DX DX DX SWITCH IN SWITCH OUT |
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