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MC14551B Scheda tecnica(PDF) 8 Page - ON Semiconductor

Il numero della parte MC14551B
Spiegazioni elettronici  Quad 2-Channel Analog Multiplexer/Demultiplexer
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC14551B Scheda tecnica(HTML) 8 Page - ON Semiconductor

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MC14551B
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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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