AND Data Sheet 27501.1D 3507 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMPERATURE OPERATION The A3507– and A3508– are sensitive, temperature-stable linear Hall-effect sensor ICs. Ratiometric, linear Hall-effect circuits 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 devices 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. X T C . U Y D L O N R P EO D C E N U E N R I E T F N E O R C S R I D FO — 1 2 3 GROUND OUTPUT CC SUPPLY V Dwg. PH-006 Each monolithic circuit integrates a quadratic 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 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. Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS 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, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA 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 FEATURES ■ Output Voltage Proportional to Applied Magnetic Field ■ Ratiometric Rail-to-Rail Output ■ Improved Sensitivity ■ Superior Temperature Stability ■ 4.5 V to 5.5 V Operation ■ Small Package Size ■ Solid-State Reliability Always order by complete part number, e.g., A3507EUA . 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMP. OPERATION 700 1 VCC 3 X OUTPUT 2 GROUND Dwg. FH-011 ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS FUNCTIONAL BLOCK DIAGRAM 600 "U" PACKAGE RθJA = 183°C/W 500 400 300 "UA" PACKAGE RθJA = 206°C/W 200 100 0 20 40 60 100 80 AMBIENT TEMPERATURE in ° C 120 140 160 Dwg. GH-046A ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage VCC Operating 4.5 5.0 5.5 V Supply Current ICC B = 0, VCC = 5.5 V, IO = 0 – – 10 mA Quiescent Voltage Output VOQ B = 0, IO = 1 mA, TA = 25°C 2.0 2.5 3.0 V B = 0, IO = 1 mA 1.8 2.5 3.2 V Output Voltage VOH 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 rO – 2.5 10 Ω Wide-Band Output Noise eo – 125 – µV B = 0, BW = 10 Hz to 10 kHz, 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), respectively. 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, 2001, Allegro MicroSystems, Inc. 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMP. OPERATION MAGNETIC CHARACTERISTICS over operating temperature range, at VCC = 5 V, IO = 1 mA (unless otherwise noted). Part Numbers A3507LUA A3507EUA A3508SUA Characteristic* Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units Operating Temp. Range, T A -40 – +150 -40 – +85 -20 – +85 °C Sensitivity at TA = 25°C 2.0 2.5 3.0 2.0 2.5 3.0 2.0 2.5 3.0 mV/G 1.7 2.5 3.3 1.7 2.5 3.3 1.7 2.5 3.3 mV/G -5.0 2.5 10 -6.3 1.2 8.7 -10 – 10 % -8.8 -1.3 6.2 -8.8 -1.3 6.2 -10 – 10 % ∆VOQ(∆T)‡ – – ±35 – – ±35 – – ±50 G 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 – % over Oper. Temp. Range ∆Sens(∆T)† at TA = Max. at TA = Min. 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 SENSOR ICS 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) (1) 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 = VO(500G) – VO(-500G) 1000 G (2) The stability of sensitivity as a function of temperature is defined as ∆Sens(∆T) = Sens(TA) – Sens(25°C) Sens(25°C) x 100% (3) 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(∆V) = VOQ(VCC) / VOQ(5V) VCC / 5 V x 100% (4) and the per cent ratiometric change in sensitivity is defined as Sens(VCC) / Sens(5V) ∆Sens(∆V) = VCC / 5 V 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 Lin+ = Lin– = VO(500G) – VOQ 2 (VO(250G) – VOQ) VO(-500G) – VOQ 2 (VO(-250G) – VOQ) x 100% (6) x 100% (7) and output symmetry as Sym = VO(500G) – VOQ VOQ – VO(-500G) 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 x 100% (8) 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMP. OPERATION APPLICATIONS INFORMATION Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the element in a particular application, are available. ELEMENT LOCATION ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 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. 0.055" 1.40 mm A BRANDED SURFACE 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 device output voltage will track changes in the LSB value. 0.082" 2.07 mm 1 2 3 Dwg. MH-011-6B TYPICAL CURRENT-SENSING APPLICATION B ≈ N x 6.9 G/A Hall-effect applications information is available in the application note “Linear Hall-Effect Sensor ICs” (AN 27702), which can be found in the latest issue of Allegro Electronic Data Book, AMS-702, or at www.allegromicro.com www.allegromicro.com Dwg. AH-005A 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMP. OPERATION TYPICAL POSITION-SENSING APPLICATIONS (Alnico 8, dimensions in inches) + + VCC VCC 0.21 D N S S N N S S N RELATIVE OUTPUT VOLTAGE D 0 VOQ 0.19 S N RELATIVE OUTPUT VOLTAGE S RELATIVE MAGNETIC FLUX DENSITY N RELATIVE MAGNETIC FLUX DENSITY ELEMENT DEPTH BELOW PACKAGE FACE N S D 0 0 0.1 0.2 0.3 0.4 RELATIVE DISTANCE (TOTAL EFFECTIVE AIR GAP) + - VOQ 0.5 -0.10 -0.08 -0.06 Dwg. GH-047 -0.04 0 0.04 RELATIVE DISTANCE 0 RELATIVE DISTANCE 0.2 0.4 GND Dwg. GH-048 N S D RELATIVE MAGNETIC FLUX DENSITY 0.21 RELATIVE OUTPUT VOLTAGE VOQ RELATIVE OUTPUT VOLTAGE RELATIVE MAGNETIC FLUX DENSITY EFFECTIVE AIR GAP = 0.050 S 0 -0.2 Dwg. GH-049 EFFECTIVE AIR GAP D -0.4 GND 0.10 VCC 0.19 - 0.08 + VCC N 0.06 EFFECTIVE AIR GAP = 0.075 EFFECTIVE AIR GAP = 0.095 0 0 0.05 0.10 0.15 RELATIVE DISTANCE 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 0.20 VOQ 0.25 Dwg. GH-050 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS FOR HIGH-TEMP. OPERATION Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) 0.164 0.159 4.17 4.04 0.062 0.058 45° 0.122 0.117 0.085 MAX 2 3 0.031 2.16 MAX 0.0173 0.0138 0.640 0.600 0.0189 0.0142 SEE NOTE BSC 2. 3. 4. 5. 45° 1 2 3 0.79 0.44 0.35 16.26 15.24 0.48 0.36 SEE NOTE 0.050 NOTES: 1. 3.10 2.97 45° 1 1.57 1.47 45° 1.27 Dwg. MH-014E in BSC Tolerances on package height and width represent allowable mold offsets Dimensions given are measured at the widest point (parting line). Exact body and lead configuration at vendor’s option within limits shown. Height does not include mold gate flash. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). Where no tolerance is specified, dimension is nominal. www.allegromicro.com Dwg. MH-014E mm 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSOR ICS 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; 5,389,889; 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 responsibility 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