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Details, datasheet, quote on part number:3517
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| Part: | 3517 |
| Category: | Sensors => Hall Effect Sensors |
| Description: | Ratiometric, Linear Hall-effect Sensors For High-temperature Operation |
| Company: | Allegro Micro Systems, Inc. |
| Datasheet: | Download 3517 datasheet File size : 155 kB |
| Request For quote: | Find where to buy 3517
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Datasheet text preview:
3517 AND 3518
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION
The A3517xUA and A3518xUA are sensitive, temperature-stable linear Hall-effect sensors with greatly improved offset characteristics. 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 A3517xUA features an output sensitivity of 5 mV/G while the A3518xUA has an output sensitivity of 2.5 mV/G. See the Magnetic Characteristics table for complete, individual device parametrics. Each BiCMOS monolithic circuit integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and a rail-to-rail lowimpedance output stage. A proprietary dynamic offset cancelation technique, with an internal highfrequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain and offset trim adjustments during the manufacturing process. These reduced-cost devices are supplied in a 3-pin ultra-mini-SIP "UA" package only.
Data Sheet 27501.11A*
V
CC
1
X
2
3
GROUND
Dwg. PH-006
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ....... 8.0 V Output Voltage, VO ... 8.0 V Output Sink Current, IO ......... 10 mA Magnetic Flux Density, B ......... Unlimited Package Power Dissipation, PD ... See Graph Operating Temperature Range*, TA Suffix S ........... -20°C to +85°C Suffix L ........... -40°C to +150°C Storage Temperature Range, TS ..... -65°C to +170°C * Infrequent excursions permitted; see Applications Information.
OUTPUT
SUPPLY
FEATURES
s s s s s s s s s Temperature-Stable Quiescent Output Voltage Precise Recoverability After Temperature Cycling Output Voltage Proportional to Applied Magnetic Field Ratiometric Rail-to-Rail Output Improved Sensitivity 4.5 V to 5.5 V Operation Immune to Mechanical Stress Small Package Size Solid-State Reliability
Always order by complete part number, e.g., A3517SUA .
3517 AND 3518 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
SUPPLY Vcc
DYNAMIC OFFSET CANCELLATION
LOW-PASS FILTER
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
700 Suffix "UA" RJA = 165°C/W 600
500
400
300
200 Suffix "S" 100 Suffix "L" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in °C 140 160 180
Dwg. GH-046-1A
2
+
X
3
OUTPUT
+
2
GROUND
Vcc/2
Dwg. FH-016A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1997, 2002 Allegro MicroSystems, Inc.
3517 AND 3518 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unless otherwise noted).
Limits Characteristic Supply Voltage Supply Current Quiescent Voltage Output Output Voltage Symbol VCC ICC VOQ VOH VOL Output Source Current Limit Bandwidth (-3 dB) Clock Frequency Output Resistance Wide-Band Output Noise (rms) IOLM BW fC rO eo IO -2 mA B = 0, BW = 10 Hz to 10 kHz, IO -1 mA, CO = 100 pF Test Conditions Operating B = 0, VCC = 6 V, IO = 0 B = 0, IO = 1 mA, TA = 25°C B = +X*, IO = 1 mA B = -X*, IO = -1 mA B = -X*, VO = 0 Min. 4.5 2.2 Typ. 5.0 7.2 2.5 Max. 5.5 12 2.8 Units V mA V
-1.0
4.7 0.2 -1.5
V V mA
30 170 1.0 400
kHz kHz µV
NOTE 1 Typical data is at TA = 25°C and is for design information only. NOTE 2 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), respectively. It is NOT intended to indicate a range of linear operation.
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3517 AND 3518 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 A3517SUA Characteristic* Operating Temp. Range, T A Sensitivity at TA = 25°C Sens(T) at TA = Max. Sens(T) at TA = Min. VOQ(T) Ratiometry, VOQ(V) Ratiometry, Sens(V) Positive Linearity, Lin+ Negative Linearity, Lin Symmetry Min. Typ. Max. -20 4.0 -5.0 5.0 2.5 +85 6.0 10 6.0 ± 20 A3517LUA Min. Typ. Max. -40 4.0 -5.0 5.0 2.5 +150 6.0 10 6.0 ± 20 A3518SUA Min. Typ. Max. -20 2.0 -5.0 2.5 2.5 +85 3.0 10 6.0 ± 20 A3518LUA Min. Typ. Max. -40 2.0 -5.0 2.5 2.5 +150 3.0 10 6.0 ± 20 Units °C mV/G % % G % % % % %
-9.0 -1.3 100 100 100 100 100
-9.0 -1.3 100 100 100 100 100
-9.0 -1.3 100 100 100 100 100
-9.0 -1.3 100 100 100 100 100
NOTE 1 Magnetic flux density is measured at most sensitive area of device located 0.018" (0.46 mm) below the branded face of the package. NOTE 2 10 G = 1 mT, exactly. NOTE 3 Except for Sens(T), typical data is at TA = 25°C and is for design information only. * See Characteristics Definitions for test conditions. This calculation (formula 1, next page) yields the device's equivalent accuracy, over the operating temperature range, in gauss.
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3517 AND 3518 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION
CHARACTERISTICS DEFINITIONS
Quiescent Voltage Output. In the quiescent state (no magnetic 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 VOQ(T) = VOQ(TA) VOQ(25°C) Sens(25°C) Ratiometry. The A3517xUA and A3518xUA 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(V) = (1) and the per cent ratiometric change in sensitivity is defined as Sens(V) = Sens(VCC) / Sens(5V) VCC / 5 V VOQ(VCC) / VOQ(5V) VCC / 5 V
x 100%
(4)
This calculation yields the device's equivalent accuracy, over the operating temperature range, in gauss. 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 VO(500G) VO(-500G) 1000 G
x 100%
(5)
Linearity and Symmetry. The on-chip output stage is designed to provide a linear output to within 500 mV of either rail with a supply voltage of 5 V. This is equivalent to approximately ±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 2 (VO(250G) VOQ) VO(-500G) VOQ 2 (VO(-250G) VOQ)
Sens =
(2) Lin+ =
x 100%
(6)
The stability of sensitivity as a function of temperature is defined as Lin = Sens(T) = Sens(TA) Sens(25°C) Sens(25°C) x 100% (3)
x 100%
(7)
and output symmetry as VO(500G) VOQ VOQ VO(-500G)
Sym =
x 100%
(8)
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