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Prod uct Bul le tin OHS3150U/3151U
August 1999
Ra ti omet ric Lin ear Hall Ef fect Sen sor
Types OHS3150U, OHS3151U
Fea tures
• A ratiometric linear output capable of
sinking and sourcing current
• 4.5 V to 6.0 V operation
• Responds equally to positive and
negative magnetic field
• Excellent temperature stability to
operate in harsh environments
• Robust package capable of
withstanding harsh environments
Description
The ratiometric linear Hall effect sensor each
contain a monolithic integrated circuit on a
single chip. The circuit incorporates a
quadratic Hall sensing element which
minimizes the effects of mechanical and
thermal stress on the Hall element and
temperature compensating circuitry to
compensate for the inherent Hall element
sensitivity change over temperature current.
These ratiometric linear Hall effect sensors
provide an output voltage that varies in
proportion to the applied magnetic field. The
voltage output will increase in response to a
south pole (positive) magnetic field applied
perpendicular to the package symbolization
face, and decrease in response to a north
pole (negative) magnetic field.
These 3150U & 3151U ratiometric linear Hall
effect sensors can be used as contactless
sensors for rotary and linear position sensing
and for current sensing. The devices in this
series are similar in performance except for
their allowable quiescent voltage output
change over the specified operating
temperature range.
Ab so lute Maxi mum Rat ings
Sup ply Volt age, VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Stor age Tem pera ture Range, T
S... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-65o C to +170o C
Op er at ing Tem pera ture Range, TA (OHS pre fix) . . . . . . . . . . . . . . . -40o C to +150o C
Lead Sol der ing Tem pera ture (1/8 inch [3.2 mm] from case for 5 sec, with sol der ing
iron) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260o C
(1)
Power Dis si pa tion, PD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mW
Out put Cur rent, IO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Mag netic Flux Den sity, B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Un lim ited
Func tional Block Dia gram
V
CC
Voltage
Reg
Quad
- Hall +
Sensor
DSC = Dual to Sin gle Con verter
Linear
Amp
OUT
GND
Optek Technology, Inc. 1215 W. Crosby Road Carrollton, Texas 75006 (972)323-2200 Fax (972)323-2396
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Type OHS3150U, OHS3151U
Elec tri cal Char ac ter is tics (Over Op er at ing Tem pera ture Range, at VCC = 5 V, un less oth er wise noted)
SYM BOL PA RAME TER MIN TYP MAX UNITS TEST CON DI TIONS
V
CC
I
CC
V
OQ
I
O
I
O
(1) Nega tive cur rent is de fined as com ing out of (sourcing) the out put.
Mag netic Char ac ter is tics (Over Op er at ing Tem pera ture, VCC = 5 V, IO = .5 mA)
Supply Voltage 4.5 5.0 6.0 V
Supply Current 5.5 10 mA VCC = 6 V, IO = 0 mA, B = OG
Quiescent Voltage Output 2.25 2.5 2.75 V B = OG, TA = 25o C
2.10 2.5 2.90 V B = OG
Sink Current 0.5 mA
Source Current -1.0 mA
SYM BOL PA RAME TER
T
A
Operating Temperature Range -40 150 -40 150
MIN TYP MAX MIN TYP MAX
Sensitivity
Sens
@ TA = 25o C
over T
A
2.25
2.0
Sens Change
∆Sens
∆V
OQ(∆T)
∆Sens
∆V
OQ(∆V)
+Lin
-Lin
(∆T)
(∆V)
@ TA > 25o C
@ TA < 25o C
VOQ Change
over T
A
Ratiometric Sens Change
Ratiometric VOQ Change
Positive Lin ≥ 25
< 25
Negative Lin ≥ 25
< 25
-5
-12
95
90
95
90
Sym Output Symmetry 90 100 110 90 100 110 %
See char ac ter is tics defi ni tions for test con di tions and cal cu la tion for mu las.
OHS3150U OHS3151U
2.5 2.75
3.0
10
3
±35 ±50 G
100 100 %
100 100 %
105
105
105
105
2.25
2.0
-5
-12
95
90
95
90
2.5 2.75
3.0
10
3
105
105
105
105
UNITS
o
C
mV/G
mV/G
%
%
%
%
Op tek re serves the right to make changes at any time in or der to im prove de sign and to sup ply the best prod uct pos si ble.
Op tek Tech nol ogy, Inc. 1215 W. Crosby Road Car roll ton, Texas 75006 (972)323- 2200 Fax (972)323- 2396
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Type OHS3150U, OHS3151U
Char ac ter is tics Defi ni tions
Quiescent Voltage Output: With no magnetic field present the device is in the quiescent state
and the voltage output is approximately equal to one-half the supply voltage (VOQ ≈ VCC/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(T)
=
V
OQ(TA)
Sens
- V
OQ(25o C)
(25o 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.
Sens =
V
O(500G)
- V
1000
O(-500G)
The change in sensitivity over temperature is specified in percent by the calculation
∆Sens
(∆T)
=
Sens
(TA)
Sens
- Sens
(25o C)
(25o C)
X 100%
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
OQ(∆V)
=
V
OQ(VCC)
- V
VCC/5 V
OQ(5 V)
X 100%
The change in sensitivity with supply voltage is also specified in percent by the calculation
∆Sens
(∆V)
=
Sens
(VCC)/
VCC/5 V
Sens
(5 V)
X 100%
Linearity and 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
+ Lin
=
- Lin =
V
2(V
V
2(V
O(500G)
O[250G]
O(-500G)
O[-250G]
- V
OQ
- VOQ)
- V
OQ
- VOQ)
X 100%
X 100%
The output symmetry is also specified in percent by the calculation
Sym =
V
VOQ - V
Op tek Tech nol ogy, Inc. 1215 W. Crosby Road Car roll ton, Texas 75006 (972)323- 2200 Fax (972)323- 2396
O(500G)
- V
OQ
O(-500G)
X 100%
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