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參數(shù)資料
| 型號(hào)： | EL5181 |
| 廠商： | Intersil Corporation |
| 英文描述： | 8ns High-Speed Comparator |
| 中文描述： | 為8ns高速比較器 |
| 文件頁(yè)數(shù)： | 9/9頁(yè) |
| 文件大小： | 106K |
| 代理商： | EL5181 |
9
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
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reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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Check the current through R
3
and make sure that it is much
greater than the input bias current as follows:
The above two methods will generate hysteresis of up to a
few hundred millivolts. Beyond that, the impedance of R
3
is
low enough to affect the bias string and adjustment of R
1
may be required.
Power Dissipation
When switching at high speeds, the comparator's drive capa-
bility is limited by the rise in junction temperature caused by
the internal power dissipation. For reliable operation, the
junction temperature must be kept below T
JMAX
(125°C).
An approximate equation for the device power dissipation is
as follows. Assume the power dissipation in the load is very
small:
where:
V
S
is the analog supply voltage from V
S
+ to V
S
-
I
S
is the analog quiescent supply current per comparator
V
SD
is the digital supply voltage from V
SD
to ground
I
SD
is the digital supply current per comparator
I
SD
strongly depends on the input switching frequency.
Please refer to the performance curve to choose the input
driving frequency. Having obtained the power dissipation,
the maximum junction temperature can be determined as
follows:
where:
T
MAX
is the maximum ambient temperature
θ
JA
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 V
REF
threshold, the comparator's output
changes state. The non-inverting and inverting inputs may
be reversed.
Crystal Oscillator
A simple crystal oscillator using one comparator of an
EL5181 is shown below. The resistors R
1
and R
2
set the
bias point at the comparator's non-inverting input. Resistors
R
3
, R
4
, and C
1
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 EL5181 will give the correct 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 200
resistor
attenuates the feedback to the non-inverting input. The cir-
cuit 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 V
CC
, but it is affected by the tol-
erances of the resistors. The duty cycle can be adjusted by
changing V
CC
value.
I
0.5V
-V
3
--------------------------------------
=
P
DISS
V
S
I
S
V
SD
I
SD
)
×
+
×
(
=
T
JMAX
T
MAX
Θ
JA
P
DISS
×
+
=
+
-
V
IN
V
REF
V
OUT
+
-
200
V
OUT
R
4
R
3
5V
1MHz to 8MHz
2k
C
1
0.01μF
5k
1.5k
2k
R
1
R
2
EL5181
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