A3518SUA Ver la hoja de datos (PDF) - Allegro MicroSystems
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A3518SUA Datasheet PDF : 13 Pages
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3517 AND 3518
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
APPLICATIONS INFORMATION
TYPICAL CURRENT-SENSING APPLICATION
Calibrated linear Hall devices, which can be used to
determine the actual flux density presented to the sensor in a
particular application, are available.
For safe, reliable operation, the output should not be pulled
above the supply voltage or pulled below the device ground.
For optimum performance, a 0.1 µF capacitor between the
supply and ground, and a 100 pF capacitor between the output
and ground, should be added.
The ratiometric feature is especially valuable when these
devices are used with an analog-to-digital converter. A/D
converters typically derive their LSB step size by ratioing off a
reference voltage line. If the reference voltage varies, the LSB
will vary proportionally. This is a major error source in many
sensing systems. The A3517xUA and A3518xUA can eliminate
this source of error by their ratiometric operation. Because their
gain and offsets are proportional to the supply voltage, if they
are powered from the A/D reference voltage, the sensor output
voltage will track changes in the LSB value.
These devices can withstand infrequent temperature
excursions, beyond the Absolute Maximum Ratings, to
TA = 170°C provided the junction temperature, TJ, does not
exceed 200°C.
Extensive applications information on Hall-effect sensors
and magnets is also available in the “Hall-Effect IC Applications
Guide”, which can be found in the latest issue of the Allegro
MicroSystems Electronic Data Book, AMS-702 or Application
Note 27701, or at
www.allegromicro.com
B ≈ N x 6.9 G/A
Dwg. AH-005A
SENSOR LOCATION
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.081"
2.06 mm
0.056"
1.42 mm
A
BRANDED
SURFACE 1
2
3
Dwg. MH-011-7A
Allegro
115 Northeast Cutoff, Box 15036
8
Worcester, Massachusetts 01615-0036 (508) 853-5000
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