3507 ALLEGRO
Document overview
- Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 8
Technical content
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 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.
FEATURES
I Output Voltage Proportional to Applied Magnetic Field I Ratiometric Rail-to-Rail Output I Improved Sensitivity I Superior Temperature Stability I 4.5 V to 5.5 V Operation I Small Package Size I Solid-State Reliability RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION Data Sheet27501.1B3507 AND 3508 Always order by complete part number, e.g., A3507EUA . Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS Magnetic Flux Density, B. . . . Unlimited Package Power Dissipation, Operating Temperature Range, TA Storage Temperature Range, Dwg. PH-006 SUPPLY VCC GROUND OUTPUT X
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3507 AND 3508
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION 600 400 200 20 60 100 140 AMBIENT TEMPERATURE in °C ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS Dwg. GH-046A "U" PACKAGE RθJA = 183°C/W "UA" PACKAGE RθJA = 206°C/W 40 80 120 160 700 500 300 100 VCC X Dwg. FH-011 GROUND2 OUTPUT3 Copyright © 1994, 2000, Allegro MicroSystems, Inc. ELECTRICAL CHARACTERISTICS over operating temperature range, at V CC = 5 V (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating 4.5 5.0 5.5 V Supply Current I CC B = 0, VCC = 5.5 V, IO = 0 – – 10 mA Quiescent V OQ B = 0, IO = 1 mA, TA = 25°C 2.0 2.5 3.0 V Voltage Output B = 0, IO = 1 mA 1.8 2.5 3.2 V Output Voltage V OH B = +X*, IO = 1 mA 4.5 4.8 – V VOL B = -X*, IO = -1 mA – 0.2 0.5 V Bandwidth (-3 dB) BW 20 – – kHz Output Resistance r O –2 . 51 0 Ω Wide-Band e o B = 0, BW = 10 Hz to 10 kHz, – 125 – µV Output Noise T A = 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), r espec- tively. It is NOT intended to indicate a range of linear operation. FUNCTIONAL BLOCK DIAGRAM
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION www.allegromicro.com MAGNETIC CHARACTERISTICS over operating temperature range, at V CC = 5 V, IO = 1 mA (unless otherwise noted). Part Numbers A3507LUA A3507EUA A3508SUA Operating Temp. Range, TA -40 – +150 -40 – +85 -20 – +85 °C ∆Sens(∆T) ∆VOQ(∆T) Ratiometry, ∆VOQ(∆V) – 100 – – 100 – – 100 – % Ratiometry, ∆Sens(∆V) – 100 – – 100 – – 100 – % Positive Linearity, Lin+ – 100 – – 100 – – 100 – % Negative Linearity, Lin– – 100 – – 100 – – 100 – % Symmetry – 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 gau ss.
Worcester, Massachusetts 01615-0036 (508) 853-5000 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION CHARACTERISTICS DEFINITIONS 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 OQ(∆V) = VOQ(VCC) / VOQ(5V) x 100% (4) VCC / 5 V and the per cent ratiometric change in sensitivity is defined as ∆Sens(∆V) = Sens(VCC) / Sens(5V) x 100% (5) VCC / 5 V 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 Lin+ = V O(500G) – VOQ x 100% (6) 2 (VO(250G) – VOQ) Lin– = VO(-500G) – VOQ x 100% (7) 2 (VO(-250G) – VOQ) and output symmetry as Sym = VO(500G) – VOQ x 100% (8) VOQ – VO(-500G) 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 (V OQ ∪ 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 OQ(∆T) = VOQ(TA) – VOQ(25°C) (1) Sens(25°C) 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 Sens = V O(500G) – VO(-500G) (2) 1000 G The stability of sensitivity as a function of temperature is defined as ∆Sens(∆T) = Sens(TA) – Sens(25°C) x 100% (3) Sens(25°C)
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION www.allegromicro.com SENSOR LOCATIONAPPLICATIONS INFORMATION Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the sensor in a particular application, are available. For safe, reliable operation, the output should not be pulled above the supply voltage or pulled below the device ground. For optimum performance, a 100 pF capacitor between the output and ground should be added. The nominal sensitivity is factory set to compensate for the temperature coefficient of samarium-cobalt magnets (-0.02%/°C). 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. 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 1 32 Dwg. MH-011-6A 0.018" 0.46 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.082" 2.07 mm 0.055" 1.40 mm A B ≈ N x 6.9 G/A Dwg. AH-005A TYPICAL CURRENT-SENSING APPLICATION
Worcester, Massachusetts 01615-0036 (508) 853-5000 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION RELATIVE DISTANCE RELATIVE MAGNETIC FLUX DENSITY Dwg. GH-048 RELATIVE OUTPUT VOLTAGE VCC VOQ -0.4 -0.2 0.2 0.4 GND- N S D 0.19 RELATIVE DISTANCE (TOTAL EFFECTIVE AIR GAP) RELATIVE MAGNETIC FLUX DENSITY Dwg. GH-047 RELATIVE OUTPUT VOLTAGE VCC VOQ N S D SENSOR DEPTH BELOW PACKAGE FACE RELATIVE DISTANCE RELATIVE MAGNETIC FLUX DENSITY Dwg. GH-050 RELATIVE OUTPUT VOLTAGE VCC VOQ N S D EFFECTIVE AIR GAP 0.21 EFFECTIVE AIR GAP = 0.050 EFFECTIVE AIR GAP = 0.075 EFFECTIVE AIR GAP = 0.095 RELATIVE DISTANCE RELATIVE MAGNETIC FLUX DENSITY Dwg. GH-049 RELATIVE OUTPUT VOLTAGE VCC VOQ GND- -0.08 0.10-0.10 N S S N N S S N D 0.21 D 0.19 S N N S TYPICAL POSITION-SENSING APPLICATIONS (Alnico 8, dimensions in inches)
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION www.allegromicro.com Dimensions in Inches Dimensions in Millimeters (controlling dimensions) (for reference only) 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. Dwg. MH-014E in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 BSC 45° 0.640 0.600 0.0189 0.0142 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE Dwg. MH-014E mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 BSC 45° 16.26 15.24 0.48 0.36 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE
Worcester, Massachusetts 01615-0036 (508) 853-5000 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION 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; 5,686,894; 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. HALL-EFFECT SENSORS Partial Part Avail. Oper. Characteristics at T A = +25°C Number Temp. B OP(max) BRP(min) Bhys(typ) Features Notes RATIOMETRIC, LINEAR HALL-EFFECT SENSORS 3503 S typ. 1.3 mV/G 3507 E/L typ. 2.5 mV/G 3508 S typ. 2.5 mV/G 3515 E/L typ. 5.0 mV/G chopper stabilized 3516 E/L typ. 2.5 mV/G chopper stabilized 3517 L/S typ. 5.0 mV/G chopper stabilized 3518 L/S typ. 2.5 mV/G chopper stabilized GEARTOOTH/RING MAGNET (DUAL ELEMENT) HALL-EFFECT SENSORS in order of BOP
3060 K/S +35 -35 30 ac coupled
3422 E/L +75 -75 46 direction detection
3059 K/S +100 -100 130 ac coupled
3056 E/L +150 -150 50 zero-speed
3058 E/L +250 -250 200 zero-speed
3421 E/L +280 -280 335 direction detection
SPECIAL-PURPOSE HALL-EFFECT SENSORS 3054 K/S +300 +5.0 50 unipolar switch, multiplexed 6
3150 J +40 to +850 – 20 programmable, chopper stabilized 1
3210 E ±70 ±5.0 7.7 micropower, chopper stabilized
3422 E/L +85 -85 46 direction detection
Operating Temperature Ranges: Notes 1. Protected. 6. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition.