3506, 3507, AND 3508 AND RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION Data Sheet 27501.1* 3506, 3507, 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION X The A3506-, A3507-, and A3508- comprise a family of 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 -40C and +150C. The three devices in this series are similar except for temperature stability over the operating temperature range. See the Magnetic Characteristics table for complete, individual device parametrics. 2 3 OUTPUT 1 GROUND 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. These devices are supplied in a 3-pin mini-SIP "U" package or a 3-pin ultra-mini-SIP "UA" package. Pinning is shown viewed from branded side. FEATURES Output Voltage Proportional to Applied Magnetic Field Ratiometric Rail-to-Rail Output Improved Sensitivity 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- .................... -20C to +85 C Suffix E- .................... -40C to +85 C Suffix L- ....................-40C to +150C Storage Temperature Range, TS ............................. -65C to +170C Superior Temperature Stability 4.5 V to 5.5 V Operation Small Package Size Solid-State Reliability Always order by complete part number: Output Offset with Temp., V OQ(T) Operating Temperature Range -20C to +85C 20 G 35 G 50 G -- -- -40C to +85C -- -40C to +150C A3506LU A3506LUA A3507EU A3507EUA A3507LU A3507LUA A3508SU A3508SUA -- A TM MicroSystems, Inc. -- 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION FUNCTIONAL BLOCK DIAGRAM ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS 1 700 VCC X 3 OUTPUT 2 GROUND Dwg. FH-011 600 "U" PACKAGE RJA = 183C/W 500 400 300 "UA" PACKAGE RJA = 206C/W 200 100 0 20 40 80 60 100 AMBIENT TEMPERATURE in C 120 140 160 Dwg. GH-046A ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unless otherwise noted). Device Characteristic Symbol Type* Supply Voltage VCC Supply Current Quiescent Voltage Output Limits Test Conditions Min. Typ. Max. Units All Operating 4.5 5.0 5.5 V ICC All B = 0, VCC = 5.5 V, IO = 0 - - 10 mA VOQ 3506 2.25 2.50 2.75 V 2.0 2.5 3.0 V 2.10 2.50 2.90 V 1.8 2.5 3.2 V B = 0, IO = 1 mA, TA = 25C 3507/08 3506 B = 0, IO = 1 mA 3507/08 Output Voltage V OH All B = +X , IO = 1 mA 4.5 4.8 - V V OL All B = -X, IO = -1 mA - 0.2 0.5 V Bandwidth (-3 dB) BW All 20 - - kHz Output Resistance rO All - 2.5 10 Wide-Band Output Noise eo All - 125 - V B = 0, BW = 10 Hz to 10 kHz, TA = 25C Negative current is defined as coming out of (sourcing) the output. * Complete part number includes the Allegro prefix "A", and a suffix to identify operating temperature range (S-, E-, or L-) and package type (-U or -UA). See first page for available combinations. 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. A TM MicroSystems, Inc. 115Northeast NortheastCutoff, Cutoff,Box Box15036 15036 115 Worcester,Massachusetts Massachusetts01615-0036 01615-0036 (508) (508)853-5000 853-5000 Worcester, Copyright (c) 1994 Allegro MicroSystems, Inc. 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION MAGNETIC CHARACTERISTICS over operating temperature range, at VCC = 5 V, IO = 1 mA (unless otherwise noted). Part Numbers* A3506L- A3507L- A3507E- A3508S- Characteristic Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Operating Temp. Range, TA -40 +150 -40 - +150 -40 - +85 -20 - +85 C Sensitivity at TA = 25C 2.25 2.50 2.75 2.0 2.5 3.0 2.0 2.5 3.0 2.0 2.5 3.0 mV/G 2.00 2.50 3.00 1.7 2.5 3.3 1.7 2.5 3.3 1.7 2.5 3.3 mV/G -2.5 over Oper. Temp. Range Sens(T) at TA = Max. at TA = Min. - Units 2.5 7.5 -5.0 2.5 10 -6.3 1.2 8.7 -10 - 10 % -6.3 -1.3 3.7 -8.8 -1.3 6.2 -8.8 -1.3 6.2 -10 - 10 % V OQ(T) - - 20 - - 35 - - 35 - - 50 G Ratiometry, VOQ(V) - 100 - - 100 - - 100 - - 100 - % Ratiometry, Sens(V) - 100 - - 100 - - 100 - - 100 - % Positive Linearity, Lin+ - 100 - - 100 - - 100 - - 100 - % Negative Linearity, Lin- - 100 - - 100 - - 100 - - 100 - % Symmetry - 100 - - 100 - - 100 - - 100 - % Magnetic flux density is measured at most sensitive area of device located 0.015" (0.38 mm) below the branded face of the "U" package; 0.018" (0.46 mm) below the branded face of the "UA" package. * Complete part number includes a suffix to indicate package type (-U or -UA). See Characteristics Definitions for test conditions. The nominal sensitivity temperature stability is designed to compensate for the temperature coefficient of samariumcobalt magnets (-0.02%/C). This calculation (formula 1, next page) yields the device's equivalent accuracy, over the operating temperature range, in gauss. 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE 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 Ratiometry. The A3506-, 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) = V OQ(T) = V OQ(TA) - VOQ(25C) V O(500G) - VO(-500G) Sens(V) = Lin+ = The stability of sensitivity as a function of temperature is defined as Lin- = Sens(25C) x 100% Sens(VCC) / Sens(5V) VCC / 5 V x 100% (5) VO(500G) - VOQ 2 (VO(250G) - VOQ) x 100% (6) x 100% (7) VO(-500G) - VOQ 2 (VO(-250G) - VOQ) (3) and output symmetry as Sym = A (4) 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 (2) 1000 G Sens(TA) - Sens(25C) x 100% and the per cent ratiometric change in sensitivity is defined as 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(T) = VCC / 5 V (1) Sens(25C) This calculation yields the device's equivalent accuracy, over the operating temperature range, in gauss. Sens = VOQ(VCC) / VOQ(5V) TM MicroSystems, Inc. VO(500G) - VOQ VOQ - VO(-500G) 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 x 100% (8) 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION APPLICATIONS 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. SENSOR LOCATIONS SUFFIX "U" ACTIVE AREA DEPTH 0.015" 0.38 mm NOM 0.091" 2.30 mm 0.073" 1.85 mm 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 A3506/07/08- 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. Extensive applications information on Hall-effect sensors and magnets is also available in the Allegro Integrated and Discrete Semiconductors Data Book or Application Note 27701. A BRANDED SURFACE 1 2 3 Dwg. MH-002-11A SUFFIX "UA" ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.082" 2.07 mm 0.055" 1.40 mm A BRANDED SURFACE 1 2 3 Dwg. MH-011-6A TYPICAL CURRENT-SENSING APPLICATION B N x 6 G/A Dwg. AH-005 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE 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 SENSOR 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 - GND 0 RELATIVE DISTANCE 0.2 0.4 Dwg. GH-048 TM MicroSystems, Inc. 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 A Dwg. GH-049 EFFECTIVE AIR GAP D -0.2 GND 0.10 VCC 0.19 -0.4 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 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION PACKAGE DESIGNATOR U Dimensions in Inches Dimensions in Millimeters (Based on 1" = 25.4 mm) 0.183 0.178 4.65 4.52 0.063 0.059 1.60 1.50 4.60 4.47 0.181 0.176 45 45 0.086 1 2 0.018 3 2.18 1 2 0.46 3 MAX MAX 0.015 0.560 0.38 14.22 MIN MIN 0.41 0.016 SEE NOTE SEE NOTE 1.27 2.54 0.050 0.100 Dwg. MH-003C in Dwg. MH-003C 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). 3506, 3507, AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION PACKAGE DESIGNATOR UA Dimensions in Inches Dimensions in Millimeters (Based on 1" = 25.4 mm) 4.17 4.04 0.164 0.159 0.062 0.058 45 1.57 1.47 45 3.10 2.97 0.122 0.117 45 45 0.085 1 2 3 0.031 2.16 1 2 3 0.79 MAX MAX 0.600 0.38 15.24 0.015 MIN MIN SEE NOTE SEE NOTE 0.016 0.41 1.27 0.050 BSC Dwg. MH-014C in BSC Dwg. MH-014C 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. 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 design of its products. Components made under military approvals will be in accordance with the approval requirements. 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 which may result from its use. A TM MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000