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參數(shù)資料
| 型號： | A3518SUA |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION |
| 中文描述： | 比例，線性霍爾效應傳感器高溫作業(yè) |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 305K |
| 代理商： | A3518SUA |
3517
AND
3518
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
www.allegromicro.com
5
CHARACTERISTICS DEFINITIONS
Ratiometry.
The A3517xUA and A3518xUA feature a
ratiometric output. The quiescent voltage output and
sensitivity are proportional to the supply voltage
(ratiometric).
The per cent ratiometric change in the quiescent
voltage output is defined as
V
OQ(
V)
=
V
OQ(VCC)
/ V
OQ(5V)
V
CC
/ 5 V
x 100%
(4)
and the per cent ratiometric change in sensitivity is defined
as
Sens
(
V)
=
Sens
(VCC)
/ Sens
(5V)
V
CC
/ 5 V
x 100%
(5)
Linearity and Symmetry.
The on-chip output stage is
designed to provide a linear output to within 500 mV of
either rail with a supply voltage of 5 V. This is equivalent
to approximately
±
800 gauss of ambient field. Although
application of stronger magnetic fields will not damage
these devices, it will force the output into a non-linear
region. Linearity in per cent is measured and defined as
Lin+ =
V
O(500G)
–
V
OQ
2 (V
O(250G)
–
V
OQ
)
x 100%
(6)
Lin
–
=
V
O(-500G)
–
V
OQ
2 (V
O(-250G)
–
V
OQ
)
x 100%
(7)
and output symmetry as
Sym =
V
O(500G)
–
V
OQ
V
OQ
–
V
O(-500G)
x 100%
(8)
Quiescent Voltage Output.
In the quiescent state (no
magnetic field), the output is ideally equal to one-half of
the supply voltage over the operating voltage and tem-
perature range (V
OQ
≈
V
CC
/
2
). Due to internal component
tolerances and thermal considerations, there is a tolerance
on the quiescent voltage output and on the quiescent
voltage output as a function of supply voltage and ambient
temperature. For purposes of specification, the quiescent
voltage output as a function of temperature is defined as
V
OQ(
T)
=
V
OQ(TA)
–
V
OQ(25
°
C)
Sens
(25
°
C)
(1)
This calculation yields the device
’
s equivalent
accuracy, over the operating temperature range, in gauss.
Sensitivity.
The presence of a south-pole magnetic field
perpendicular to the package face (the branded surface)
will increase the output voltage from its quiescent value
toward the supply voltage rail by an amount proportional to
the magnetic field applied. Conversely, the application of
a north pole will decrease the output voltage from its
quiescent value. This proportionality is specified as the
sensitivity of the device and is defined as
Sens =
V
O(500G)
–
V
O(-500G)
1000 G
(2)
The stability of sensitivity as a function of tempera-
ture is defined as
Sens
(
T)
=
Sens
(TA)
–
Sens
(25
°
C)
x 100%
Sens
(25
°
C)
(3)
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