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A1318 Datasheet PDF - Allegro

Part Number A1318
Description Linear Hall-Effect Sensor ICs
Manufacturers Allegro 
Logo Allegro Logo 

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A1318 datasheet, circuit
A1318 and A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
Features and Benefits
• 3.3 V supply operation
• QVO temperature coefficient programmed at Allegrofor
improved accuracy
• Miniature package options
• High bandwidth, low noise analog output
• High speed chopping scheme minimizes QVO drift across
operating temperature range
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic
capabilities
• Undervoltage lockout (UVLO)
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive
applications
Packages
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)
Description
New applications for linear output Hall-effect sensors, such
as displacement and angular position, require higher accuracy
and smaller package sizes. The Allegro A1318 and A1319
linear Hall-effect sensor ICs have been designed specifically to
meet both requirements. These temperature-stable devices are
available in both surface-mount and through hole packages.
The accuracy of each device is enhanced via end-of-line
optimization. Each device features non-volatile memory to
optimize device sensitivity and the quiescent voltage output
(QVO: output in the absence of a magnetic field) for a given
application or circuit. This A1318 and A1319 optimized
performance is sustained across the full operating temperature
range by programming the temperature coefficient for both
sensitivity and QVO at Allegro end-of-line test.
These ratiometric Hall-effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. The
quiescent voltage output is adjusted around 50% of the supply
voltage.
The features of these linear devices make them ideal for
use in automotive and industrial applications requiring high
accuracy, and operate across an extended temperature range,
–40°C to 150°C.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
Approximate footprint
Continued on the next page…
V+
VCC
Functional Block Diagram
VOUT
CBYPASS
Sensitivity and
Sensitivity TC
Offset and
Offset TC
A1318-DS, Rev. 1.
GND

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A1318 equivalent
A1318 and
A1319
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low Profile Surface Mount Package
OPERATING CHARACTERISTICS (continued) Valid over TA , CBYPASS = 0.1 µF, VCC = 3.3 V; unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ. Max.
Unit1
Electrical Characteristics (continued)
A1318LLHLX-1-T
0.08 0.12 0.16
%/°C
Sensitivity Temperature Coefficient
TCSens
A1318LLHLX-2-T
A1318LUA-2-T
A1319LLHLX-5-T
Programmed at TA
= 150°C, calculated
relative to Sens at 25°C
0.08
0.08
0.08
0.12
0.12
0.12
0.16
0.16
0.16
%/°C
%/°C
%/°C
A1319LUA-5-T
0.08 0.12 0.16
%/°C
Error Components
Linearity Sensitivity Error
Symmetry Sensitivity Error
Ratiometry Quiescent Voltage
Output Error8
LinERR
– ±1.5 –
SymERR
– ±1.5 –
RatVOUT(Q)
Across supply voltage range (relative to VCC =
5 V)
±1.5
%
%
%
Ratiometry Sensitivity Error8
RatSens
Across supply voltage range (relative to VCC =
5 V)
±1.5
%
Ratiometry Clamp Error9
Drift Characteristics
RatVOUTCLP
TA = 25°C, across supply voltage range (relative
to VCC = 5 V)
±1.5
%
A1318LLHLX-1-T
–15 – 5 mV
Typical Quiescent Voltage Output Drift
Across Temperature Range
VOUT(Q)
A1318LLHLX-2-T
A1318LUA-2-T
A1319LLHLX-5-T
TA = 150°C
–18 – 8 mV
–13 0 13 mV
–20 – 20 mV
A1319LUA-5-T
–15 0 15 mV
Sensitivity Drift Due to
Package Hysteresis
SensPKG TA = 25°C, after temperature cycling
– ±2 –
%
1 1 G (gauss) = 0.1 mT (millitesla),
2On power-up, the output of the device is held low until VCC exceeds VUVLOHI. After the device is powered, the output remains valid until VCC drops
below VUVLOLO , when the output is pulled low.
3See the Characteristic Definitions section.
4Determined by design and characterization, not evaluated at final test.
5fC varies as much as approximately ±20% across the full operating ambient temperature range and process.
6VCLPLOW and VCLPHIGH scale with VCC due to ratiometry.
7Sensitivity drift through the life of the part, ΔSensLIFE , can have a typical error value ±3% in addition to package hysteresis effects.
8Percent change from actual value at VCC = 3.3 V, for a given temperature.
9Percent change from actual value at VCC = 3.3 V, TA = 25°C.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5

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Information Total 12 Pages
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