MC74HCT4066A Datasheet, PDF (9/13 Pages) ON Semiconductor – Quad Analog Switch Multiplexer/Demultiplexer

MC74HCT4066A
0
- 10
FUNDAMENTAL FREQUENCY
- 20
- 30
- 40
- 50
DEVICE
- 60
SOURCE
- 70
- 80
- 90
1.0
2.0
3.0
FREQUENCY (kHz)
Figure 17. Plot, Harmonic Distortion
APPLICATION INFORMATION
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
MOSORB® (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.
V_CC = 5 V
+5V
ANALOG I/O
14
ANALOG O/I
+5V
ON
0V
0V
SELECTED
CONTROL
INPUT
7
OTHER CONTROL
INPUTS
V_CC
D_x
D_x
V_CC
16
D_x
ON
D_x
V_CC
SELECTED
CONTROL
INPUT
OTHER CONTROL
INPUTS
7
Figure 18. 5 V Application
Figure 19. Transient Suppressor Application
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