MC74VHC4066 Datasheet, PDF (10/13 Pages) Motorola, Inc – Quad Analog Switch/Multiplexer/Demultiplexer

V_IS
0.1 μF
f_in
V_CC
V_OS
TO
ON
DISTORTION
R_L
C_L*
METER
V_CC/2
SELECTED V_CC
7 CONTROL
INPUT
*Includes all probe and jig capacitance.
Figure 20. Total Harmonic Distortion, Test Set−Up
0
−10
FUNDAMENTAL FREQUENCY
−20
−30
−40
−50
DEVICE
−60
SOURCE
−70
−80
−90
1.0
2.0
3.0
FREQUENCY (kHz)
Figure 19. Plot, Harmonic Distortion
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 21,
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 22. 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 (high current surge protectors).
Mosorbs are fast turn−on devices ideally suited for precise
DC protection with no inherent wear out mechanism.
+ 12 V
0V
ANALOG I/O
V_CC = 12 V
14
ANALOG O/I
ON
+ 12 V
0V
SELECTED
CONTROL
INPUT
7
OTHER CONTROL
INPUTS
(V_CC OR GND)
Figure 21. 12 V Application
V_CC
D_x
D_x
V_CC
16
D_x
ON
D_x
V_CC
SELECTED
CONTROL
INPUT
OTHER CONTROL
INPUTS
7
(V_CC OR GND)
Figure 22. Transient Suppressor Application
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