MC74HC4316A Datasheet, PDF (8/11 Pages) ON Semiconductor – Quad Analog Switch/Multiplexer/Demultiplexer with Separate Analog and Digital Power Supplies

MC74HC4316A
0
– 10
FUNDAMENTAL FREQUENCY
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
– 100
1.0
DEVICE
SOURCE
2.0
3.0
FREQUENCY (kHz)
Figure 15. Plot, Harmonic Distortion
APPLICATION INFORMATION
The Enable and Control pins should be at VCC or GND
logic levels, VCC being recognized as logic high and GND
being recognized as a logic low. Unused analog inputs/out-
puts may be left floating (not connected). However, it is ad-
visable to tie unused analog inputs and outputs to VCC or
VEE 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 VCC and VEE. The positive peak analog
voltage should not exceed VCC. Similarly, the negative peak
analog voltage should not go below VEE. In the example
below, the difference between VCC and VEE is twelve volts.
Therefore, using the configuration in Figure 16, a maximum
analog signal of twelve volts peak–to–peak can be con-
trolled.
When voltage transients above VCC and/or below VEE 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 maxi-
mum anticipated current surges during clipping. An alternate
method would be to replace the Dx diodes with MOsorbs
(Motorola high current surge protectors). MOsorbs are fast
turn–on devices ideally suited for precise dc protection with
no inherent wear out mechanism.
VCC = 6 V
+6V
ANALOG I/O
16
ANALOG O/I
+6V
ON
–6 V
–6 V
+ 6 V SELECTED
CONTROL
INPUT
VEE
8
–6 V
ENABLE CONTROL
INPUTS
(VCC OR GND)
Figure 16.
VCC
Dx
16
ON
Dx
VCC _SELECTED
CONTROL
VEE
INPUT
VEE
VCC
Dx
Dx
VEE
ENABLE CONTROL
INPUTS
(VCC OR GND)
Figure 17. Transient Suppressor Application
MOTOROLA
8
High–Speed CMOS Logic Data
DL129 — Rev 6