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MC14551B Scheda tecnica(PDF) 8 Page - ON Semiconductor |
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MC14551B Scheda tecnica(HTML) 8 Page - ON Semiconductor |
8 / 12 page MC14551B http://onsemi.com 8 APPLICATIONS INFORMATION Figure A illustrates use of the on–chip level converter detailed in Figure 2. The 0–to–5 volt Digital Control signal is used to directly control a 9 Vp–p 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 VEE. The VDD voltage determines the maximum recommended peak above VSS. The VEE voltage determines the maximum swing below VSS. For the example, VDD – VSS = 5 volt maximum swing above VSS; VSS – VEE = 5 volt maximum swing below VSS. The example shows a ± 4.5 volt signal which allows a 1/2 volt margin at each peak. If voltage transients above VDD and/or below VEE 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 VEE is 18.0 volts. Most parameters are specified up to 15 volts which is the recommended maximum difference between VDD and VEE. Balanced supplies are not required. However, VSS must be greater than or equal to VEE. For example, VDD = + 10 volts, VSS = + 5 volts, and VEE = – 3 volts is acceptable. See the table below. Figure A. Application Example EXTERNAL CMOS DIGITAL CIRCUITRY 9 Vp-p ANALOG SIGNAL 0-TO-5 V DIGITAL CONTROL SIGNAL VDD VSS VEE SWITCH I/O COMMON O/I CONTROL MC14551B -5 V + 5 V 9 Vp-p ANALOG SIGNAL +4.5 V -4.5 V GND VDD VDD VEE VEE Dx Dx Dx Dx SWITCH I/O COMMON O/I Figure B. External Schottky or Germanium Clipping Diodes + 5 V POSSIBLE SUPPLY CONNECTIONS VDD In Volts VSS In Volts VEE In Volts Control Inputs Logic High/Logic Low In Volts Maximum Analog Signal Range In Volts + 8 0 – 8 + 8/0 + 8 to – 8 = 16 Vp–p + 5 0 – 12 + 5/0 + 5 to – 12 = 17 Vp–p + 5 0 0 + 5/0 + 5 to 0 = 5 Vp–p + 5 0 – 5 + 5/0 + 5 to – 5 = 10 Vp–p + 10 – 5 + 10/ + 5 + 10 to – 5 = 15 Vp–p |
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