MC74HC4316

MOTOROLA

High–Speed CMOS Logic Data

DL129 — Rev 6

8

0

– 10

– 20

– 30

– 40

– 50

– 100

1.0

2.0

FREQUENCY (kHz)

– 60

– 70

– 80

– 90

FUNDAMENTAL FREQUENCY

DEVICE

SOURCE

Figure 15. Plot, Harmonic Distortion

3.0

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 MO

sorbs

(Motorola high current surge protectors). MO

sorbs are fast

turn–on devices ideally suited for precise dc protection with

no inherent wear out mechanism.

ANALOG O/I

ON

16

VCC = 6 V

ANALOG I/O

+ 6 V

– 6 V

+ 6 V

– 6 V

ENABLE CONTROL

INPUTS

(VCC OR GND)

ON

16

VCC

Dx

Dx

VCC

Dx

Figure 16.

Figure 17. Transient Suppressor Application

8

SELECTED

CONTROL

INPUT

Dx

SELECTED

CONTROL

INPUT

+ 6 V

VEE

– 6 V

VCC

VEE

ENABLE CONTROL

INPUTS

(VCC OR GND)

VEE

VEE