EL5481CU 查看數據表（PDF） - Elantec -> Intersil

零件编号

产品描述 (功能)

生产厂家

EL5481CU

Quad 8ns High-Speed Comparators

Elantec -> Intersil 

EL5481C/EL5482C

Quad 8ns High-Speed Comparators

where:

TMAX is the maximum ambient temperature

θJA is the thermal resistance of the package

Threshold Detector

The inverting input is connected to a reference voltage

and the non-inverting input is connected to the input. As

the input passes the VREF threshold, the comparator's

output changes state. The non-inverting and inverting

inputs may be reversed.

the tolerances of the resistors. The duty cycle can be

adjusted by changing VCC value.

5V

R1 5kΩ

200Ω

1MHz to

8MHz

+

R2 1.5kΩ -

VOUT

R3

C1

0.01µF

R4

2kΩ

2kΩ

VIN

+

VREF

-

VOUT

Crystal Oscillator

A simple crystal oscillator using one comparator of an

EL5481C and EL5482C is shown below. The resistors

R1 and R2 set the bias point at the comparator's non-

inverting input. Resistors R3, R4, and C1 set the invert-

ing input node at an appropriate DC average voltage

based on the output. The crystal's path provides resonant

positive feedback and stable oscillation occurs.

Although the EL5481C and EL5482C will give the cor-

rect logic output when an input is outside the common

mode range, additional delays may occur when it is so

operated. Therefore, the DC bias voltages at the inputs

are set about 500mV below the center of the common

mode range and the 200Ω resistor attenuates the feed-

back to the non-inverting input. The circuit will operate

with most AT-cut crystal from 1MHz to 8MHz over a

2V to 7V supply range. The output duty cycle for this

circuit is roughly 50% at 5V VCC, but it is affected by

10

Share Link: