A3507* [ETC]
RATIOMETRIC.LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION ; RATIOMETRIC.LINEAR霍尔效应传感器,高温作业\n型号: | A3507* |
厂家: | ETC |
描述: | RATIOMETRIC.LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION
|
文件: | 总8页 (文件大小:171K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
3508 AND
3507
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMPERATURE OPERATION
The A3507– and A3508– are sensitive, temperature-stable linear
Hall-effect sensors. Ratiometric, linear Hall-effect sensors provide a
voltage output that is proportional to the applied magnetic field and have
a quiescent output voltage that is approximately 50% of the supply
voltage. These magnetic sensors are ideal for use in linear and rotary
position sensing systems in the harsh environments of automotive and
industrial applications over extended temperatures to -40°C and +150°C.
The two devices are similar except for temperature stability over the
operating temperature range. See the Magnetic Characteristics table for
complete, individual device parametrics.
Each monolithic circuit integrates a quadratic Hall element, im-
proved temperature compensating circuitry to reduce the intrinsic
sensitivity drift of the Hall element, a small-signal high-gain amplifier,
and a rail-to-rail low-impedance output stage. Many problems normally
associated with low-level analog signals are minimized by having the
V
CC
1
2
3
Hall element and amplifier in a single chip. Output precision is obtained
by internal gain and offset trim adjustments during the manufacturing
process.
The first character of the part number suffix determines the device
operating temperature range: suffix ‘S–’ is for -20°C to +85°C, suffix
‘E–’ is for -40°C to +85°C, and suffix ‘L–’ is for -40°C to +150°C.
These devices are supplied in a 3-pin ultra-mini-SIP ‘–UA’ package.
Dwg. PH-006
Pinning is shown viewed from branded side.
FEATURES
ABSOLUTE MAXIMUM RATINGS
I Output Voltage Proportional to Applied Magnetic Field
I Ratiometric Rail-to-Rail Output
I Improved Sensitivity
Supply Voltage, VCC . . . . . . . . . . . . 6.0 V
Output Voltage, VO . . . . . . . . . . . . . 6.0 V
Output Sink Current, IO . . . . . . . . 5.0 mA
Magnetic Flux Density, B . . . . Unlimited
Package Power Dissipation,
I Superior Temperature Stability
I 4.5 V to 5.5 V Operation
I Small Package Size
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range, TA
I Solid-State Reliability
Suffix ‘S–’ . . . . . . . . . . . . -20°C to +85°C
Suffix ‘E–’ . . . . . . . . . . . . -40°C to +85°C
Suffix ‘L–’ . . . . . . . . . . . -40°C to +150°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65°C to +170°C
Always order by complete part number, e.g., A3507EUA .
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
700
600
500
400
300
FUNCTIONAL BLOCK DIAGRAM
"U" PACKAGE
R
θJA = 183°C/W
1
V
CC
3
2
OUTPUT
GROUND
X
"UA" PACKAGE
R
θJA = 206°C/W
200
100
0
Dwg. FH-011
20
40
60
80
100
120
140
160
AMBIENT TEMPERATURE in °C
Dwg. GH-046A
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unless otherwise
noted).
Limits
Characteristic
Supply Voltage
Supply Current
Symbol
VCC
Test Conditions
Min.
4.5
–
Typ. Max. Units
Operating
5.0
–
5.5
10
3.0
3.2
–
V
mA
V
ICC
B = 0, VCC = 5.5 V, IO = 0
B = 0, IO = 1 mA, TA = 25°C
B = 0, IO = 1 mA
Quiescent
Voltage Output
VOQ
2.0
1.8
4.5
–
2.5
2.5
4.8
0.2
–
V
Output Voltage
VOH
VOL
BW
rO
B = +X*, IO = 1 mA
B = -X*, IO = -1 mA
V
0.5
–
V
Bandwidth (-3 dB)
Output Resistance
20
–
kHz
Ω
2.5
125
10
–
Wide-Band
eo
B = 0, BW = 10 Hz to 10 kHz,
–
µV
Output Noise
TA = 25°C
Negative current is defined as coming out of (sourcing) the output.
* This test requires positive and negative fields sufficient to swing the output driver between fully OFF and saturated (ON), respec-
tively. It is NOT intended to indicate a range of linear operation.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994, 2000, Allegro MicroSystems, Inc.
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
MAGNETIC CHARACTERISTICS over operating temperature range, at VCC = 5 V, IO = 1 mA
(unless otherwise noted).
Part Numbers
A3507EUA
A3507LUA
A3508SUA
Typ. Max.
Characteristic*
Min.
-40
2.0
1.7
-5.0
-8.8
–
Typ. Max. Min.
Typ. Max.
Min.
-20
2.0
1.7
-10
-10
–
Units
°C
Operating Temp. Range, TA
Sensitivity at TA = 25°C
over Oper. Temp. Range
∆Sens(∆T)† at TA = Max.
at TA = Min.
–
+150
3.0
3.3
10
6.2
35
–
-40
2.0
1.7
-6.3
-8.8
–
–
+85
3.0
3.3
8.7
6.2
35
–
–
+85
3.0
3.3
10
10
50
–
2.5
2.5
2.5
-1.3
–
2.5
2.5
1.2
-1.3
–
2.5
2.5
–
mV/G
mV/G
%
–
%
‡
∆VOQ(∆T)
–
G
Ratiometry, ∆VOQ(∆V)
Ratiometry, ∆Sens(∆V)
Positive Linearity, Lin+
Negative Linearity, Lin–
Symmetry
–
100
100
100
100
100
–
100
100
100
100
100
–
100
100
100
100
100
%
–
–
–
–
–
–
%
–
–
–
–
–
–
%
–
–
–
–
–
–
%
–
–
–
–
–
–
%
Magnetic flux density is measured at most sensitive area of device located 0.018" (0.46 mm) below the branded face of the “UA”
package.
* See Characteristics Definitions for test conditions.
† The nominal sensitivity temperature stability is designed to compensate for the temperature coefficient of samarium-cobalt
magnets (-0.02%/°C).
‡ This calculation (formula 1, next page) yields the device’s equivalent accuracy, over the operating temperature range, in gauss.
www.allegromicro.com
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
CHARACTERISTICS DEFINITIONS
Quiescent Voltage Output. In the quiescent state (no mag-
netic field), the output is ideally equal to one-half of the supply
voltage over the operating voltage and temperature range (VOQ
∪ VCC/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
Ratiometry. The A3507– and A3508– 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
VOQ(VCC) / VOQ(5V)
∆VOQ(∆V)
=
x 100%
(4)
VCC / 5 V
VOQ(TA) – VOQ(25°C)
and the per cent ratiometric change in sensitivity is defined as
∆VOQ(∆T)
=
(1)
Sens(25°C)
Sens(VCC) / Sens(5V)
This calculation yields the device’s equivalent accuracy,
over the operating temperature range, in gauss.
∆Sens(∆V)
=
x 100%
(5)
VCC / 5 V
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
Linearity and Symmetry. The on-chip output stage is de-
signed to provide a linear output to within 500 mV of either rail
with a supply voltage of 5 V. This is equivalent to approxi-
mately 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
VO(500G) – VOQ
Lin+ =
Lin– =
x 100%
x 100%
(6)
(7)
VO(500G) – VO(-500G)
2 (VO(250G) – VOQ
)
Sens =
(2)
1000 G
VO(-500G) – VOQ
2 (VO(-250G) – VOQ
The stability of sensitivity as a function of temperature is
defined as
)
and output symmetry as
Sym =
Sens(TA) – Sens(25°C)
Sens(25°C)
∆Sens(∆T)
=
x 100%
(3)
VO(500G) – VOQ
VOQ – VO(-500G)
x 100%
(8)
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
APPLICATIONS INFORMATION
SENSOR LOCATION
Calibrated linear Hall devices, which can be used to
determine the actual flux density presented to the sensor in a
particular application, are available.
ACTIVE AREA DEPTH
0.018"
0.082"
0.46 mm
2.07 mm
NOM
0.055"
1.40 mm
For safe, reliable operation, the output should not be
pulled above the supply voltage or pulled below the device
ground.
A
For optimum performance, a 100 pF capacitor between
the output and ground should be added.
BRANDED
SURFACE
1
2
3
The nominal sensitivity is factory set to compensate for
the temperature coefficient of samarium-cobalt magnets
(-0.02%/°C).
Dwg. MH-011-6A
The ratiometric feature is especially valuable when these
devices are used with an analog-to-digital converter. A/D
converters typically derive their LSB step size by ratioing off a
reference voltage line. If the reference voltage varies, the LSB
will vary proportionally. This is a major error source in many
sensing systems. The A3507/08– can eliminate this source of
error by their ratiometric operation. Because their gain and
offsets are proportional to the supply voltage, if they are
powered from the A/D reference voltage, the sensor output
voltage will track changes in the LSB value.
TYPICAL CURRENT-SENSING APPLICATION
B ≈ N x 6.9 G/A
Hall-effect applications information is available in the
application note “Linear Hall-Effect Sensors” (AN 27702),
which can be found in the latest issue of Allegro Electronic
Data Book, AMS-702, or at
www.allegromicro.com
Dwg. AH-005A
www.allegromicro.com
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
TYPICAL POSITION-SENSING APPLICATIONS
(Alnico 8, dimensions in inches)
VCC
VCC
+
+
0.21
D
N
S
S
N
SENSOR DEPTH
BELOW PACKAGE FACE
N
S
N
S
S
N
D
0
VOQ
0.19
S
N
N
S
D
0
VOQ
0.5
GND
0.10
-
0
0.1
0.2
0.3
0.4
-0.06
-0.04
0
0.04
0.06
0.08
-0.10
-0.08
RELATIVE DISTANCE (TOTAL EFFECTIVE AIR GAP)
RELATIVE DISTANCE
Dwg. GH-047
Dwg. GH-049
VCC
VCC
+
+
EFFECTIVE
AIR GAP
0.19
EFFECTIVE AIR GAP = 0.050
EFFECTIVE AIR GAP = 0.075
N
S
N
S
D
0.21
D
0
VOQ
EFFECTIVE AIR GAP = 0.095
0
VOQ
0.25
GND
-
-0.4
-0.2
0
0.2
0.4
0
0.05
0.10
0.15
0.20
RELATIVE DISTANCE
RELATIVE DISTANCE
Dwg. GH-048
Dwg. GH-050
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
Dimensions in Inches
Dimensions in Millimeters
(controlling dimensions)
(for reference only)
0.164
0.159
4.17
4.04
0.062
0.058
1.57
1.47
45°
45°
0.122
0.117
3.10
2.97
45°
45°
0.031
0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640
0.600
0.0173
0.0138
16.26
15.24
0.44
0.35
0.0189
0.0142
0.48
0.36
SEE NOTE
SEE NOTE
0.050
BSC
1.27
BSC
Dwg. MH-014E in
Dwg. MH-014E mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
www.allegromicro.com
3507 AND 3508
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
HALL-EFFECT SENSORS
Partial Part Avail. Oper.
Characteristics at T = +25°C
A
Number
Temp.
B
B
B
Features
Notes
OP(max)
RP(min)
hys(typ)
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS
3503
3507
3508
3515
3516
3517
3518
S
E/L
S
E/L
E/L
L/S
L/S
typ. 1.3 mV/G
typ. 2.5 mV/G
typ. 2.5 mV/G
typ. 5.0 mV/G
typ. 2.5 mV/G
typ. 5.0 mV/G
typ. 2.5 mV/G
chopper stabilized
chopper stabilized
chopper stabilized
chopper stabilized
GEARTOOTH/RING MAGNET (DUAL ELEMENT) HALL-EFFECT SENSORS in order of B
OP
3060
3422
3059
3056
3058
3421
K/S
E/L
K/S
E/L
E/L
E/L
+35
+75
+100
+150
+250
+280
-35
-75
-100
-150
-250
-280
30
46
130
50
200
335
ac coupled
direction detection
ac coupled
zero-speed
zero-speed
direction detection
SPECIAL-PURPOSE HALL-EFFECT SENSORS
3054
3150
3210
3421
3422
K/S
J
+300
+40 to +850
70
+5.0
–
5.0
-280
-85
50
20
7.7
335
46
unipolar switch, multiplexed
6
1
programmable, chopper stabilized
micropower, chopper stabilized
direction detection
E
E/L
E/L
+280
+85
direction detection
Operating Temperature Ranges:
S = -20°C to +85°C, E = -40°C to +85°C, J = -40°C to +115°C, K = -40°C to +125°C, L = -40°C to +150°C
Notes 1. Protected.
6. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition.
The products described herein are manufactured under one or more
of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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