Ratiometric Linear Hall-effect Sensor
OHN3150U, OHN3151U, OHS3150U, OHS3151U
Characteristics Definitions
Quiescent voltage Output:
With no magnetic field present the device in the quiescent state and the voltage
output is approximately equal to one-half the supply voltage (V
OQ
= V
CC
/ 2) over
the operating voltage and temperature range. The change in quiescent voltage
output over temperature gives the device’s equivalent accuracy and is specified in
gauss by the calculation.
V
OQ (TA)
- V
OQ (25°C)
∆V
OQ (T)
= ————————-
Sens
(25°C)
Sensitivity:
A magnetic south pole at, and perpendicular to, the device’s symbolized package
face will increase the voltage output above the quiescent value. Conversely a
magnetic north pole will decrease the voltage output below the quiescent value.
This change in voltage output with applied magnetic field is sensitivity and is
specified in mV/G by the calculation.
VO
(+500G)
- V
O (-500G)
Sens = —————————————
1000
The change is sensitivity over temperature is specified in percent by the
calculation
Sens
(TA)
- Sens
(25°C)
∆Sens
(∆T)
=
———————————-
X 100%
Sens
(25°C)
Ratiometry:
The quiescent voltage output and sensitivity of these ratiometric linear Hall-effect
devices are proportional to the supply voltage. The change in quiescent voltage
output with supply voltage is specified in percent by the calculation
V
O (VCC)
- V
O (5V)
∆V
OQ (∆V)
=
——————————
X 100%
V
CC
/ 5 V
This change in sensitivity with supply voltage is also specified in percent by the
calculation
V
OQ (VCC)
/ V
OQ (5V)
∆Sens
(∆V)
=
——————————
X 100%
V
CC
/ 5 V
Linearity & Symmetry:
The ability of the voltage output to vary in constant proportion to the applied
magnetic field is linearity and is specified in percent by the calculation
V
O (+500G) -
V
OQ
+ Linearity =
——————————
X 100%
2(V
O (250G)
-V
OQ
)
- Linearity =
V
O (-500G) -
V
OQ
——————————
2(V
O (-250G)
-V
OQ
)
X 100%
The output is also specified in percent by the calculation
V
O (500G) -
V
OQ
- Linearity =
——————————
X 100%
V
OQ
-V
OQ (-500G)
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
OPTEK Technology Inc. —
1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747
FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A
06/05
Page 3 of 4
OPTEK [ OPTEK TECHNOLOGIES ]
