EL5486CU-T13 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL5486CU-T13

Quad 4ns High Speed Comparators

Elantec -> Intersil 

EL5485C, EL5486C - Preliminary

Quad 4ns High Speed Comparators

output changes state. The non-inverting and inverting

inputs may be reversed.

VIN

+

VREF

-

VOUT

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

the tolerances of the resistors. The duty cycle can be

adjusted by changing VCC value.

Crystal Oscillator

A simple crystal oscillator using one comparator of an

EL5485C and EL5486C 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 EL5485C and EL5486C 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-

5V

R1 5kΩ

R2 1.5kΩ

C1

0.01µF

200Ω

+

-

R4

2kΩ

1MHz to

8MHz

R3

2kΩ

VOUT

11

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