MC14066B
APPLICATIONS INFORMATION
Figure A illustrates use of the Analog Switch. The
0−to−5 V digital control signal is used to directly control a
5 V peak−to−peak analog signal.
The digital control logic levels are determined by V
DD
and V
SS
. The V
DD
voltage is the logic high voltage, the V
SS
voltage is logic low. For the example, V
DD
= + 5 V = logic
high at the control inputs; V
SS
= GND = 0 V = logic low.
The maximum analog signal level is determined by V
DD
and V
SS
. The analog voltage must not swing higher than
V
DD
or lower than V
SS
.
The example shows a 5 V peak−to−peak signal which
allows no margin at either peak. If voltage transients above
+5 V
V
DD
V
SS
+5.0 V
5 V
p−p
ANALOG SIGNAL
+5 V
SWITCH
IN
V
DD
and/or below V
SS
are anticipated on the analog
channels, external diodes (D
x
) 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
V
DD
and V
SS
is 18 V. Most parameters are specified up to
15 V which is the
recommended
maximum difference
between V
DD
and V
SS
.
SWITCH
OUT
5 V
p−p
ANALOG SIGNAL
+
2.5 V
GND
EXTERNAL
CMOS
DIGITAL
CIRCUITRY
0−TO−5 V DIGITAL
CONTROL SIGNALS
MC14066B
Figure A. Application Example
V
DD
D
X
SWITCH
IN
D
X
V
SS
SWITCH
OUT
V
DD
D
X
D
X
V
SS
Figure B. External Germanium or Schottky Clipping Diodes
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