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, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Stor age Tem pera ture Range, T
S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-65
o
C to +170
o
C
Op er at ing Tem pera ture Range, T
A
(OHS pre fix) . . . . . . . . . . . . . . . -40
o
C to +150
o
C
Lead Sol der ing Tem pera ture (1/8 inch [3.2 mm] from case for 5 sec, with sol der ing
iron) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
o
C
(1)
Power Dis si pa tion, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mW
Out put Cur rent, I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Mag netic Flux Den sity, B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Un lim ited
Func tional Block Dia gram
Prod uct Bul le tin OHS3150U/3151U
August 1999
Ra ti omet ric Lin ear Hall Ef fect Sen sor
Types OHS3150U, OHS3151U
Optek Technology, Inc. 1215 W. Crosby Road Carrollton, Texas 75006 (972)323-2200 Fax (972)323-2396
41
Voltage
Reg
Quad
- Hall +
Sensor
Linear
Amp
OUT
V
CC
GND
DSC = Dual to Sin gle Con verter
Type OHS3150U, OHS3151U
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
Elec tri cal Char ac ter is tics (Over Op er at ing Tem pera ture Range, at V
CC
= 5 V, un less oth er wise noted)
SYM BOL
PA RAME TER
MIN TYP MAX UNITS
TEST CON DI TIONS
V
CC
Supply Voltage
4.5
5.0
6.0
V
I
CC
Supply Current
5.5
10
mA
V
CC
= 6 V, I
O
= 0 mA, B = OG
V
OQ
Quiescent Voltage Output
2.25
2.5
2.75
V
B = OG, T
A
= 25
o
C
2.10
2.5
2.90
V
B = OG
I
O
Sink Current
0.5
mA
I
O
Source Current
-1.0
mA
(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, V
CC
= 5 V, I
O
= .5 mA)
SYM BOL
PA RAME TER
OHS3150U
OHS3151U
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
T
A
Operating Temperature Range
-40
150
-40
150
o
C
Sens
Sensitivity
@ T
A
= 25
o
C
over T
A
2.25
2.0
2.5
2.75
3.0
2.25
2.0
2.5
2.75
3.0
mV/G
mV/G
Sens
(
T)
Sens Change
@ T
A
> 25
o
C
@ T
A
< 25
o
C
-5
-12
10
3
-5
-12
10
3
%
%
V
OQ(
T)
V
OQ
Change
over T
A
35
50
G
Sens
(
V)
Ratiometric Sens Change
100
100
%
V
OQ(
V)
Ratiometric V
OQ
Change
100
100
%
+Lin
Positive Lin
25
<
25
95
90
105
105
95
90
105
105
%
-Lin
Negative Lin
25
<
25
95
90
105
105
95
90
105
105
%
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.
42
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 (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.
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.
The change in sensitivity over temperature is specified in percent by the calculation
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.
The change in sensitivity with supply voltage is also specified in percent by the calculation
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
The output symmetry is also specified in percent by the calculation
Type OHS3150U, OHS3151U
Op tek Tech nol ogy, Inc. 1215 W. Crosby Road Car roll ton, Texas 75006 (972)323- 2200 Fax (972)323- 2396
V
OQ(T)
=
V
OQ(TA)
- V
OQ(25
o
C)
Sens
(25
o
C)
Sens =
V
O(500G)
- V
O(-500G)
1000
V
OQ(
V)
=
V
OQ(VCC)
- V
OQ(5 V)
X 100%
V
CC
/5 V
Sens
(
V)
=
Sens
(VCC)/
Sens
(5 V)
X 100%
V
CC
/5 V
Sens
(
T)
=
Sens
(TA)
- Sens
(25
o
C)
X 100%
Sens
(25
o
C)
+ Lin
=
V
O(500G)
- V
OQ
X 100%
2(V
O[250G]
- V
OQ
)
- Lin =
V
O(-500G)
- V
OQ
X 100%
2(V
O[-250G]
- V
OQ
)
Sym =
V
O(500G)
- V
OQ
X 100%
V
OQ
- V
O(-500G)
43
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