EL5185CS-T7 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL5185CS-T7

4ns High-Speed Comparator

Elantec -> Intersil 

EL5185C - Preliminary

4ns High-Speed Comparator

output changes state. The non-inverting and inverting

inputs may be reversed.

VIN

+

VREF

-

VOUT

Crystal Oscillator

A simple crystal oscillator using one comparator of an

EL5185C 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 inverting 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 EL5185C

will give the correct logic output when an input is out-

side 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 feedback 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.

5V

R1 5kΩ

R2 1.5kΩ

C1

0.01µF

200Ω

+

-

R4

2kΩ

1MHz to

8MHz

R3

2kΩ

VOUT

10

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