MC74HC4051A_06 Datasheet, PDF (10/18 Pages) ON Semiconductor – Analog Multiplexers / Demultiplexers

MC74HC4051A, MC74HC4052A, MC74HC4053A
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 12. Crosstalk Between Any Two
Switches, Test Set−Up
V_IS
0.1mF
f_in
V_CC
16
ON
V_OS
R_L
C_L*
TO
DISTORTION
METER
6
7
8
V_EE
*Includes all probe and jig capacitance
Figure 14a. Total Harmonic Distortion, 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 13. Power Dissipation Capacitance,
Test Set−Up
0
−10
FUNDAMENTAL FREQUENCY
−20
−30
−40
−50
DEVICE
−60
SOURCE
−70
−80
−90
− 100
1.0
2.0
3.125
FREQUENCY (kHz)
Figure 14b. Plot, Harmonic Distortion
APPLICATIONS INFORMATION
The Channel Select and Enable control pins should be at
V_CC or GND logic levels. V_CC being recognized as a logic
high and GND being recognized as a logic low. In this
example:
V_CC = +5V = logic high
GND = 0V = logic low
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 15, 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 feedthrough 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 volts
V_EE − GND = 0 to −6 volts
V_CC − V_EE = 2 to 12 volts
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
16. These diodes should be able to absorb the maximum
anticipated current surges during clipping.
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