A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
The A1301 and A1302 are continuous-time, ratiometric, linear Hall-effect sensors.
They are optimized to accurately provide a voltage output that is proportional to
an applied magnetic field. These devices have a quiescent output voltage that is
50% of the supply voltage. Two output sensitivity options are provided: 2.5 mV/G
typical for the A1301, and 1.3 mV/G typical for the A1302.
The Hall-effect integrated circuit included in each device includes a Hall sensing
element, a linear amplifier, and a CMOS Class A output structure. Integrating the
Hall sensing element and the amplifier on a single chip minimizes many of the
problems normally associated with low voltage level analog signals.
High precision in output levels is obtained by internal gain and offset trim adjust-
ments made at end-of-line during the manufacturing process.
These features make the A1301 and A1302 ideal for use in position sensing
systems, for both linear target motion and rotational target motion. They are well-
suited for industrial applications over extended temperature ranges, from –40°C to
125°C.
Package UA, 3-pin SIP
Two device package types are available: LH, a 3-pin SOT23W type for surface
mount, and UA, a 3-pin ultramini SIP for through-hole mount. Each package is
available in a lead (Pb) free version (suffix,
–T)
with 100% matte tin plated lead-
frame.
Package LH, 3-pin Surface Mount
1. VCC
2. VOUT
3. GND
3
1
2
1. VCC
2. GND
3. VOUT
1
2
3
Features and Benefits
Low-noise output
Fast power-on time
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
............................................
8 V
Output Voltage, V
OUT
..........................................
8 V
Reverse-Supply Voltage, V
RCC
.......................
–0.1 V
Reverse-Output Voltage, V
ROUT
.....................
–0.1 V
Output Sink Current, I
OUT
.............................
10 mA
Operating Temperature
Ambient, T
A
, Range E..................
–40ºC to 85ºC
Ambient, T
A
, Range K ...............
–40ºC to 125ºC
Maximum Junction, T
J(max)
........................165ºC
Storage Temperature, T
S
..................
–65ºC to 170ºC
Ratiometric rail-to-rail output
4.5 to 6.0 V operation
Solid-state reliability
Factory-programmed at end-of-line for optimum performance
Robust ESD performance
A1301-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
Product Selection Guide
Part Number
A1301ELHLT
A1301ELHLT-T
A1301EUA
A1301EUA-T
A1301KLHLT
A1301KLHLT-T
A1301KUA
A1301KUA-T
A1302ELHLT
A1302ELHLT-T
A1302EUA
A1302EUA-T
A1302KLHLT
A1302KLHLT-T
A1302KUA
A1302KUA-T
Pb-free
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
Packing*
7-in. tape and reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. tape and reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. tape and reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. tape and reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Package
Surface Mount
–40ºC to 85ºC
SIP
2.5 mV/G
Surface Mount
–40ºC to 125ºC
SIP
Surface Mount
–40ºC to 85ºC
SIP
1.3 mV/G
Surface Mount
–40ºC to 125ºC
SIP
Ambient, T
A
Sensitivity (Typical)
*Contact Allegro for additional packing options.
Functional Block Diagram
V+
VCC
Voltage
Regulator
Filter
Amp
Out
VOUT
Gain
CBYPASS
Offset
Trim
Control
GND
Terminal List
Symbol
VCC
VOUT
GND
Description
Connects power supply to chip
Output from circuit
Ground
Number
Package LH Package UA
1
1
2
3
3
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2
A1301-DS, Rev. 2
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
DEVICE CHARACTERISTICS
over operating temperature range, T
A
, and V
CC
= 5 V, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Electrical Characteristics
Supply Voltage
V
CC
Running, T
J
< 165°C
4.5
Output open
–
Supply Current
I
CC
V
OUT(High)
I
SOURCE
= –1 mA, Sens = nominal
4.65
Output Voltage
–
V
OUT(Low)
I
SINK
= 1 mA, Sens = nominal
Output Bandwidth
BW
–
V
CC(min)
to 0.95 V
OUT;
B = ±1400 G;
Power-On Time
t
PO
–
Slew rate = 4.5 V/µs to 4.5 V/100 ns
Output Resistance
R
OUT
I
SINK
≤
1 mA, I
SOURCE
≥
–1 mA
–
External output low pass filter
≤
10 kHz;
Wide Band Output Noise, rms
V
OUTN
–
Sens = nominal
Ratiometry
Quiescent Output Voltage Error
∆V
OUTQ(V)
T
A
= 25°C
–
with respect to
∆V
CC1
Magnetic Sensitivity Error with
∆Sens
(V)
T
A
= 25°C
–
respect to
∆V
CC2
Output
Linearity
Lin
T
A
= 25°C
–
Symmetry
Sym
T
A
= 25°C
–
Magnetic Characteristics
Quiescent Output Voltage
V
OUTQ
B = 0 G; T
A
= 25°C
2.4
Quiescent Output Voltage over
V
OUTQ(∆T
A
)
B = 0 G
2.2
Operating Temperature Range
2.0
A1301; T
A
= 25°C
Magnetic Sensitivity
Sens
A1302; T
A
= 25°C
1.0
A1301
1.8
Magnetic Sensitivity over
Sens
(∆T
A
)
Operating Temperature Range
A1302
0.85
1
Refer to equation (4) in Ratiometric section on page 4.
2
Refer to equation (5) in Ratiometric section on page 4.
Typ.
–
–
4.7
0.2
20
3
2
150
Max.
6
11
–
0.25
–
5
5
–
Units
V
mA
V
V
kHz
µs
Ω
µV
–
–
–
–
2.5
–
2.5
1.3
–
–
±3.0
±3.0
±2.5
±3.0
2.6
2.8
3.0
1.6
3.2
1.75
%
%
%
%
V
V
mV/G
mV/G
mV/G
mV/G
A1301-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
Characteristic Definitions
Quiescent Output Voltage.
In the quiescent state (no sig-
nificant magnetic field: B = 0), the output, V
OUTQ
, equals one
half of the supply voltage, V
CC
, throughout the entire operating
ranges of V
CC
and ambient temperature, T
A
. Due to internal
component tolerances and thermal considerations, however,
there is a tolerance on the quiescent output voltage,
∆V
OUTQ
,
which is a function of both
∆V
CC
and
∆T
A
. For purposes of speci-
fication, the quiescent output voltage as a function of tempera-
ture,
∆V
OUTQ(∆T
A
)
, is defined as:
∆V
OUTQ(∆Τ
Α
)
=
V
OUTQ(Τ
Α
)
–
V
OUTQ(25ºC)
Sens
(25ºC)
Ratiometric.
The A1301 and A1302 feature a ratiometric
output. This means that the quiescent voltage output, V
OUTQ
,
and the magnetic sensitivity, Sens, are proportional to the supply
voltage, V
CC
.
The ratiometric change (%) in the quiescent voltage output is
defined as:
∆V
OUTQ(∆V)
=
∆V
OUTQ(V
CC
)
V
CC
∆V
OUTQ(5V)
5V
× 100%
(4)
and the ratiometric change (%) in sensitivity is defined as:
(1)
∆Sens
(∆V)
=
Sens
(V
CC
)
V
CC
Sens
(5V)
5V
× 100%
(5)
where Sens is in mV/G, and the result is the device equivalent
accuracy, in gauss (G), applicable over the entire operating tem-
perature range.
Sensitivity.
The presence of a south-polarity (+B) magnetic
field, perpendicular to the branded face of the device package,
increases the output voltage, V
OUT
, in proportion to the magnetic
field applied, from V
OUTQ
toward the V
CC
rail. Conversely, the
application of a north polarity (–B) magnetic field, in the same
orientation, proportionally decreases the output voltage from its
quiescent value. This proportionality is specified as the magnetic
sensitivity of the device and is defined as:
Sens
=
V
OUT(–B)
–
V
OUT(+B)
2B
Linearity and Symmetry.
The on-chip output stage is
designed to provide linear output at a supply voltage of 5 V.
Although the application of very high magnetic fields does not
damage these devices, it does force their output into a nonlinear
region. Linearity in percent is measured and defined as:
Lin+
=
V
OUT(+B)
–
V
OUTQ
2 (V
OUT(+B½)
– V
VOUTQ
)
V
OUT(–B)
–
V
OUTQ
2(V
OUT(–B½)
– V
OUTQ
)
× 100%
(6)
(2)
Lin–
=
× 100%
(7)
The stability of the device magnetic sensitivity as a function of
ambient temperature,
∆
Sens
(∆T
A
)
(%) is defined as:
∆Sens
(∆Τ
Α
)
=
Sens
(Τ
Α
)
–
Sens
(25ºC)
Sens
(25ºC)
× 100%
and output symmetry as:
Sym
=
V
OUT(+B)
–
V
OUTQ
V
OUTQ
– V
OUT(–B)
× 100%
(3)
(8)
A1301-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
A1301 and A1302
Continuous-Time Ratiometric Linear Hall Effect Sensors
Typical Characteristics
(30 pieces, 3 fabrication lots)
1301 Device Sensitivity vs. Ambient Temperature
2.65
2.60
Sensitivity (mV/G)
2.55
2.50
2.45
2.40
2.35
–50 –25
0
25
50
75
Temperature (°C)
100 125 150
LH Package
Sensitivity (mV/G)
UA Package
1.40
1.38
1.36
1.34
1.32
1.30
1.28
1.26
1.24
-50
-25
0
25
50
75 100 125 150
Temperature (°C)
LH Package
UA Package
1302 Device Sensitivity vs. Temperature
1301 Device V
OUTQ
vs. Ambient Temperature
1302 Device V
OUTQ
vs. Ambient Temperature
2.60
2.60
Output Voltage (V)
Output Voltage (V)
2.55
2.55
2.50
2.50
2.45
2.45
2.40
–50
–25
0
25
50
75 100
Temperature (°C)
125
150
2.40
–50
–25
0
25
50
75 100
Temperature (°C)
125
150
1301 Device Sensitivity vs. Supply Voltage
3.5
1.7
1.6
1302 Device Sensitivity vs. Supply Voltage
Sensitivity (mV/G)
Sensitivity (mV/G)
3.0
2.5
1.5
1.4
1.3
1.2
1.1
2.0
1.5
4.5
5.0
5.5
Supply Voltage (V)
6.0
1.0
4.5
5.0
5.5
Supply Voltage (V)
6.0
Continued on the next page...
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5
A1301-DS, Rev. 2
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