MC74HC4066A
http://onsemi.com
11
0
-10
-20
-30
-40
-50
1.0 2.0
FREQUENCY (kHz)
dBm
-60
-70
-80
-90
FUNDAMENTAL FREQUENCY
DEVICE
SOURCE
Figure 15. Plot, Harmonic Distortion
3.0
APPLICATION INFORMATION
The ON/OFF Control pins should be at V
CC
or GND logic
levels, V
CC
being recognized as logic high and GND being
recognized as a logic low. Unused analog inputs/outputs
may be left floating (not connected). However, it is
advisable to tie unused analog inputs and outputs to V
CC
or
GND through a low value resistor. This minimizes crosstalk
and feedthrough noise that may be picked−up by the unused
I/O pins.
The maximum analog voltage swings are determined by
the supply voltages V
CC
and GND. The positive peak analog
voltage should not exceed V
CC
. Similarly, the negative peak
analog voltage should not go below GND. In the example
below, the difference between V
CC
and GND is twelve volts.
Therefore, using the configuration in Figure 16, a maximum
analog signal of twelve volts peak−to−peak can be
controlled.
When voltage transients above V
CC
and/or below GND
are anticipated on the analog channels, external diodes (Dx)
are recommended as shown in Figure 17. These diodes
should be small signal, fast turn−on types able to absorb the
maximum anticipated current surges during clipping. An
alternate method would be to replace the Dx diodes with
Mosorbs (Mosorb™ is an acronym for high current surge
protectors). Mosorbs are fast turn−on devices ideally suited
for precise DC protection with no inherent wear out
mechanism.
ANALOG O/I
ON
14
V
CC
= 12 V
ANALOG I/O
+ 12 V
0 V
+ 12 V
0 V
OTHER CONTROL
INPUTS
(V
CC
OR GND)
ON
16
V
CC
D
x
D
x
V
CC
D
x
Figure 16. 12 V Application Figure 17. Transient Suppressor Application
7
SELECTED
CONTROL
INPUT
D
x
OTHER CONTROL
INPUTS
(V
CC
OR GND)
7
SELECTED
CONTROL
INPUT
V
CC
