Datasheet

ManualsBrandsAllegro ManualsHall Effect SensorsLow Noise Linear Sensor SIP-3

Description

New applications for linear output Hall-effect devices, such

as displacement, angular position, and current measurement,

require high accuracy in conjunction with small package size.

The Allegro

A1324, A1325, and A1326 linear Hall-effect

sensor ICs are designed specifically to achieve both goals. This

temperature-stable device is available in a miniature surface

mount package (SOT23W) and an ultra-mini through-hole

single in-line package.

These ratiometric Hall effect sensor ICs provide a voltage

output that is proportional to the applied magnetic field. They

feature a quiescent voltage output of 50% of the supply voltage.

The A1324/25/26 feature factory programmed sensitivities of

5.0 mV/G, 3.125 mV/G, and 2.5 mV/G, respectively.

The features of these linear devices make them ideal for use in

automotive and industrial applications requiring high accuracy,

and are guaranteed through an extended temperature range,

–40°C to 150°C.

Each BiCMOS monolithic circuit integrates a Hall element,

temperature-compensating circuitry to reduce the intrinsic

sensitivity drift of the Hall element, a small-signal high-gain

amplifier, a clamped low-impedance output stage, and a

proprietary dynamic offset cancellation technique.

These devices are available in a 3-pin ultra-mini SIP package

(UA), and a 3-pin surface mount SOT-23 style package (LH). Both

are lead (Pb) free, with 100% matte tin leadframe plating.

A1324-DS, Rev. 1

Features and Benefits

• Temperature-stable quiescent output voltage and sensitivity

• Output voltage proportional to magnetic flux density

• Low-noise output increases accuracy

• Precise recoverability after temperature cycling

• Ratiometric rail-to-rail output

• Wide ambient temperature range: –40°C to 150°C

• Immune to mechanical stress

• Solid-state reliability

• Enhanced EMC performance for stringent automotive

applications

Low Noise, Linear Hall Effect Sensor ICs with Analog Output

Functional Block Diagram

A1324, A1325, and A1326

Packages

Approximate footprint

3-pin SOT23-W

2 mm × 3 mm × 1 mm

(suffix LH)

3-pin ultramini SIP

1.5 mm × 4 mm × 3 mm

(suffix UA)

Trim Control

Sensitivity and

Sensitivity TC

Offset

Tuned Filter

GND

V+

VOUT

Dynamic Offset

Cancellation

To All Subcircuits

Summary of content (12 pages)

PAGE 1
A1324, A1325, and A1326 Low Noise, Linear Hall Effect Sensor ICs with Analog Output Features and Benefits Description • Temperature-stable quiescent output voltage and sensitivity • Output voltage proportional to magnetic flux density • Low-noise output increases accuracy • Precise recoverability after temperature cycling • Ratiometric rail-to-rail output • Wide ambient temperature range: –40°C to 150°C • Immune to mechanical stress • Solid-state reliability • Enhanced EMC performance for stringent automo
PAGE 2
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Selection Guide Packing1 Part Number Sensitivity (Typ.
PAGE 3
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output OPERATING CHARACTERISTICS Valid throughout TA range, CBYPASS = 0.1 μF, VCC = 5 V; unless otherwise noted Characteristics Symbol Test Conditions Min. Unit1 Typ. Max. 4.5 5.0 5.5 V – 6.9 9 mA Electrical Characteristics Supply Voltage VCC Supply Current ICC No load on VOUT Power-On Time2 tPO TA = 25°C, CL (PROBE) = 10 pF – 32 – μs Supply Zener Clamp Voltage VZ TA = 25°C, ICC = 12 mA 6 8.
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A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output OPERATING CHARACTERISTICS (continued) Valid throughout TA range, CBYPASS = 0.1 μF, VCC = 5 V; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. Max. Unit1 –10 – 10 G –1.5 – 1.
PAGE 5
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Characteristic Definitions Power-On Time When the supply is ramped to its operating voltage, the device output requires a finite time to react to an input magnetic field. Power-On Time is defined as the time it takes for the output voltage to begin responding to an applied magnetic field after the power supply has reached its minimum specified operating voltage, VCC(min).
PAGE 6
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output TA = 25°C, and Sens(25°C)1 is the value of sensitivity at TA = 25°C after temperature cycling TA up to 150°C, down to –40°C, and back to up 25°C. Symmetry Sensitivity Error The magnetic sensitivity of a device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. Linearity Sensitivity Error The 132x is designed to provide linear output in response to a ramping applied magnetic field.
PAGE 7
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Typical Characteristics (30 pieces, 3 fabrication lots) Average Supply Current versus Ambient Temperature VCC = 5 V 12 11 ICCav (mA) 10 9 8 7 6 5 4 – 40 25 150 TA (°C) Average Negative Linearity versus Ambient Temperature VCC = 5 V 105 105 104 104 103 103 102 102 Lin–av (%) Lin+av (%) Average Postive Linearity versus Ambient Temperature VCC = 5 V 101 100 99 101 100 99 98 98 97 97 96 96 95 95 – 40 25 150
PAGE 8
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Typical Characteristics, continued (30 pieces, 3 fabrication lots) Average Absolute Quiescent Voltage Output versus Ambient Temperature VCC = 5 V Quiescent Voltage Output versus Supply Voltage TA = 25°C 3.0 2.565 2.525 2.9 A1324 A1325 2.8 A1325 A1326 2.7 A1326 2.505 2.485 VOUT(Q) (V) VOUT(Q)av (V) 2.545 A1324 2.6 2.5 2.4 2.3 2.465 2.2 2.445 2.1 2.0 2.425 – 40 25 150 4.5 TA (°C) 6.0 5.5 A1324 4.0 3.
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A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output V+ 1[1] VCC VOUT 2[3] VOUT A132x CBYPASS 0.1 μF GND 3[2] Pin numbers in brackets refer to the UA package Typical Application Circuit Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset that can be produced at the output of the Hall IC.
PAGE 10
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Package LH, 3-Pin SOT23W +0.12 2.98 –0.08 1.49 D 3 +4° 4° –0° A +0.020 0.180–0.053 0.96 D +0.10 2.90 –0.20 +0.19 1.91 –0.06 2.40 0.70 D 0.25 MIN 1.00 2 1 0.55 REF 0.25 BSC 0.95 Seating Plane Gauge Plane 8X 10° REF B PCB Layout Reference View Branded Face 1.00 ±0.13 +0.10 0.05 –0.05 0.95 BSC 0.40 ±0.
PAGE 11
A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Package UA, 3-Pin SIP +0.08 4.09 –0.05 45° B C E 2.05 NOM 1.52 ±0.05 10° 1.44 NOM +0.08 3.02 –0.05 E Mold Ejector Pin Indent E Branded Face 45° NNN 0.79 REF A 1.02 MAX 1 D Standard Branding Reference View 1 2 = Supplier emblem N = Last three digits of device part number 3 +0.03 0.41 –0.06 14.99 ±0.
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A1324, A1325, and A1326 Linear Hall Effect Sensor ICs with Analog Output Revision History Revision Revision Date Rev. 1 October 11, 2011 Description of Revision Update Sensitivity specifications Copyright ©2010-2011, Allegro MicroSystems, Inc. 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.