MC74VHCXXXXDT datasheet(10/13 Pages) ONSEMI | Quad Analog Switch/Multiplexer/Demultiplexer High?뭁erformance Silicon?묰ate CMOS

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Spiegazioni elettronici	Quad Analog Switch/Multiplexer/Demultiplexer High?뭁erformance Silicon?묰ate CMOS

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Produttore elettronici	ONSEMI [ON Semiconductor]

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10

0

−10

−20

−30

−40

−50

1.0

2.0

FREQUENCY (kHz)

−60

−70

−80

−90

FUNDAMENTAL FREQUENCY

DEVICE

SOURCE

Figure 19. Plot, Harmonic Distortion

3.0

ON

VCC

0.1 μF

CL*

fin

RL

TO

DISTORTION

METER

*Includes all probe and jig capacitance.

VOS

VIS

7

SELECTED

CONTROL

INPUT

VCC

Figure 20. Total Harmonic Distortion, Test Set−Up

VCC/2

APPLICATION INFORMATION

The ON/OFF 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/outputs

may be left floating (not connected). However, it is

advisable to tie unused analog inputs and outputs to VCC 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 VCC and GND. The positive peak

analog voltage should not exceed VCC. Similarly, the

negative peak analog voltage should not go below GND. In

the example below, the difference between VCC 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 VCC 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.

ANALOG O/I

ON

14

VCC = 12 V

ANALOG I/O

+ 12 V

0 V

+ 12 V

0 V

OTHER CONTROL

INPUTS

(VCC OR GND)

ON

16

VCC

Dx

Dx

VCC

Dx

Figure 21. 12 V Application

Figure 22. Transient Suppressor Application

7

SELECTED

CONTROL

INPUT

Dx

OTHER CONTROL

INPUTS

(VCC OR GND)

7

SELECTED

CONTROL

INPUT

VCC

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