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A1365LKTTN-2-T Datasheet(PDF) 16 Page - Allegro MicroSystems

Part No. A1365LKTTN-2-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-2-T Datasheet(HTML) 16 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
16
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Sensitivity Drift Through Temperature Range
(ΔSensTC )
Second-order-sensitivity temperature-coefficient effects cause the
magnetic sensitivity, Sens, to drift from its expected value over
the operating ambient temperature range (TA). The Sensitivity
Drift Through Temperature Range (∆SensTC) is defined as:
SensTA– SensEXPECTED(TA)
SensEXPECTED(TA)
∆SensTC =
×100% . (9)
Sensitivity Drift Due to Package Hysteresis
(ΔSensPKG )
Package stress and relaxation can cause the device sensitivity at
TA = 25°C to change during and after temperature cycling. The
sensitivity drift due to package hysteresis (∆SensPKG) is defined
as:
Sens(25°C)2 – Sens(25°C)1
Sens(25°C)1
∆SensPKG =
×100% ,
(10)
where Sens(25°C)1 is the programmed value of sensitivity at TA = 25°C,
and Sens(25°C)2 is the value of sensitivity at TA = 25°C, after tempera-
ture cycling TA up to 150°C and back to 25°C.
Linearity Sensitivity Error (LinERR )
The A1365 is designed to provide a linear output in response to
a ramping applied magnetic field. Consider two magnetic fields,
B1 and B2. Ideally, the sensitivity of a device is the same for both
fields, for a given supply voltage and temperature. Linearity error
is present when there is a difference between the sensitivities
measured at B1 and B2.
Linearity Error
Linearity error is calculated separately for the positive
(LinERRPOS) and negative (LinERRNEG) applied magnetic fields.
Linearity Error (%) is measured and defined as:
SensBPOS2
SensBPOS1
SensBNEG2
SensBNEG1
1–
LinERRPOS =
×100% ,


1–
LinERRNEG =
×100% ,


(11)
where:
|VOUT(Bx) VOUT(Q)|
Bx
SensBx =
,
(12)
and BPOSx and BNEGx are positive and negative magnetic
fields, with respect to the quiescent voltage output such that
|BPOS2| = 2 × |BPOS1| and |BNEG2| = 2 × |BNEG1|.
Then:
LinERR max(LinERRPOS , LinERRNEG )
=
.
(13)
Symmetry Sensitivity Error (SymERR )
The magnetic sensitivity of an A1365 device is constant for any
two applied magnetic fields of equal magnitude and opposite
polarities. Symmetry Error, SymERR (%), is measured and
defined as:
SensBPOS
SensBNEG
1–
SymERR =
×100% ,


(14)
where SensBx is as defined in equation 12, and BPOSx and
BNEGx are positive and negative magnetic fields such that
|BPOSx| = |BNEGx|.
Ratiometry Error (RatERR )
The A1365 device features ratiometric output. This means that
the Quiescent Voltage Output (VOUT(Q)) magnetic sensitivity,
Sens, and Output Voltage Clamp (VCLP(HIGH) and VCLP(LOW)) are
proportional to the Supply Voltage (VCC). In other words, when
the supply voltage increases or decreases by a certain percent-
age, each characteristic also increases or decreases by the same
percentage. Error is the difference between the measured change
in the supply voltage relative to 5 V, and the measured change in
each characteristic.
The ratiometric error in Quiescent Voltage Output,
RatERRVOUT(Q) (%), for a given supply voltage (VCC) is defined
as:
VOUT(Q)(VCC) / VOUT(Q)(5V)
VCC / 5 V
1–
RatERRVOUT(Q) =
×100% .


(15)
The ratiometric error in magnetic sensitivity, RatERRSens (%), for
a given Supply Voltage (VCC) is defined as:
Sens(VCC) / Sens(5V)
VCC / 5 V
1–
RatERRSens =
×100% .


(16)
The ratiometric error in the clamp voltages, RatERRCLP (%), for a
given supply voltage (VCC) is defined as:


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