el5185 Intersil Corporation, el5185 Datasheet - Page 9

• Manufacturer Part Number: el5185
• Description: 4ns High-speed Comparator
• Manufacturer: Intersil Corporation

where:
I
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:
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
changes state. The non-inverting and inverting inputs may
be reversed.
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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
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.
SD
T
V
I
V
I
T
JMAX
S
SD
JA
MAX
S
SD
strongly depends on the input switching frequency.
is the analog quiescent supply current per comparator
is the analog supply voltage from V
is the digital supply current per comparator
is the thermal resistance of the package
is the digital supply voltage from V
=
is the maximum ambient temperature
T
MAX
V
REF
REF
V
IN
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
+
threshold, the comparator's output
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
JA
For information regarding Intersil Corporation and its products, see www.intersil.com
P
+
-
DISS
9
V
OUT
S
SD
+ to V
to ground
S
-
EL5185
Crystal Oscillator
A simple crystal oscillator using one comparator of an
EL5185 is shown below. The resistors R
bias point at the comparator's non-inverting input. Resistors
R
DC average voltage based on the output. The crystal's path
provides resonant positive feedback and stable oscillation
occurs. Although the EL5185 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
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 V
affected by the tolerances of the resistors. The duty cycle
can be adjusted by changing V
3
, R
4
resistor attenuates the feedback to the non-inverting
, and C
1.5k
5k
1
R
R
set the inverting input node at an appropriate
1
2
0.01µF
5V
C
1
+
-
200
2k
R
4
CC
value.
1MHz to
8MHz
2k
R
3
1
and R
V
CC
OUT
2
set the
, but it is