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A1323EUA-T3 Datasheet(PDF) 7 Page - Allegro MicroSystems

Part # A1323EUA-T3
Description  Ratiometric Linear Hall Effect Sensor ICs for High-Temperature Operation
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1323EUA-T3 Datasheet(HTML) 7 Page - Allegro MicroSystems

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Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
A1321, A1322,
and
A1323
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Quiescent Voltage Output.
In the quiescent state (no
magnetic field), the output equals one half of the supply voltage
over the operating voltage range and the operating temperature
range. Due to internal component tolerances and thermal con-
siderations, there is a tolerance on the quiescent voltage output
both as a function of supply voltage and as a function of ambient
temperature. For purposes of specification, the quiescent voltage
output as a function of temperature is defined in terms of mag-
netic flux density, B, as:
This calculation yields the device’s equivalent accuracy,
over the operating temperature range, in gauss (G).
Sensitivity.
The presence of a south-pole magnetic field per-
pendicular to the package face (the branded surface) increases
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:
The stability of sensitivity as a function of temperature is
defined as:
Characteristic Definitions
Ratiometric.
The A132X family features a ratiometric output.
The quiescent voltage output and sensitivity are proportional to
the supply voltage (ratiometric).
The percent ratiometric change in the quiescent voltage output is
defined as:
and the percent ratiometric change in sensitivity is
defined as:
Linearity and Symmetry.
The on-chip output stage
is designed to provide a linear output with a supply voltage of
5 V. Although application of very high magnetic fields will not
damage these devices, it will force the output into a non-linear
region. Linearity in percent is measured and defined as:
and output symmetry as:
ΔVout(q)(ΔΤ)
Vout(q)(ΤΑ) Vout(q)(25ºC)
Sens(25ºC)
=
(1)
2B
Vout(–B)
Vout(+B)
Sens
=
ΔSens(ΔΤ)
SensΑ)
Sens(25ºC)
Sens(25ºC)
=
× 100%
(2)
(3)
Vout(q)(V
CC)
Vout(q)(5V)
ΔVout(q)(ΔV) =
× 100%
VCC 5 V
(4)
VCC 5 V
=
× 100%
ΔSens(ΔV)
Sens(V
CC
) Sens(5V)
(5)
=
× 100%
Lin+
Vout(+B)
2(Vout(+B / 2) – Vout(q) )
Vout(q)
(6)
=
× 100%
Lin–
Vout(–B)
2(Vout(–B / 2) – Vout(q) )
Vout(q)
(7)
=
× 100%
Sym
Vout(+B)
Vout(q) – Vout(–B)
Vout(q)
(8)


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