MC74HCT4051A_11 Datasheet, PDF (10/16 Pages) ON Semiconductor – Analog Multiplexers / Demultiplexers

MC74HCT4051A, MC74HCT4052A, MC74HCT4053A
V_IS
R_L
f_in
0.1mF
16
ON
OFF
V_EE
R_L
R_L
6
7
8
V_OS
C_L* ^RL
C_L*
*Includes all probe and jig capacitance
Figure 18. Crosstalk Between Any Two
Switches, Test Set−Up
V_CC
ANALOG I/O
V_CC
A
16
ON/OFF
OFF/ON
COMMON O/I
NC
6
7
V_EE
8
V_CC
11
CHANNEL SELECT
Figure 19. Power Dissipation Capacitance,
Test Set−Up
0
V_IS
V_CC
V_OS
- 10
0.1mF
16
TO
- 20
f_in
ON
DISTORTION
- 30
R_L
C_L*
METER
- 40
- 50
- 60
6
7
- 70
8
- 80
V_EE
*Includes all probe and jig capacitance
- 90
- 100
Figure 20.
Figure 20a. Total Harmonic Distortion, Test Set−Up
FUNDAMENTAL FREQUENCY
DEVICE
SOURCE
1.0
2.0
FREQUENCY (kHz)
Figure 20b. Plot, Harmonic Distortion
3.125
APPLICATIONS INFORMATION
The maximum analog voltage swings are determined by
the supply voltages V_CC and V_EE. The positive peak analog
voltage should not exceed V_CC. Similarly, the negative peak
analog voltage should not go below V_EE. In this example,
the difference between V_CC and V_EE is ten volts. Therefore,
using the configuration of Figure 21, a maximum analog
signal of ten volts peak−to−peak can be controlled. Unused
analog inputs/outputs may be left floating (i.e., not
connected). However, tying unused analog inputs and
outputs to V_CC or GND through a low value resistor helps
minimize crosstalk and feed−through noise that may be
picked up by an unused switch.
Although used here, balanced supplies are not a
requirement. The only constraints on the power supplies are
that:
V_CC − GND = 2 to 6 V
V_EE − GND = 0 to −6 V
V_CC − V_EE = 2 to 12 V
and V_EE ≤ GND
When voltage transients above V_CC and/or below V_EE are
anticipated on the analog channels, external Germanium or
Schottky diodes (D_x) are recommended as shown in
Figure 22. These diodes should be able to absorb the
maximum anticipated current surges during clipping.
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