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參數(shù)資料
| 型號(hào)： | A1322LUA |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Ratiometric Linear Hall Effect Sensor for High-Temperature Operation |
| 中文描述： | 比例式線性霍爾效應(yīng)傳感器的高高溫作業(yè) |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大小： | 413K |
| 代理商： | A1322LUA |
5
A1321-DS Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
A1321/A1322/A1323
Characteristic De
fi
nitions
Quiescent Voltage Output.
In the quiescent state (no
magnetic
fi
eld), 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 speci
fi
cation, the quiescent voltage
output as a function of temperature is de
fi
ned in terms of mag-
netic
fl
ux 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
fi
eld 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
fi
eld
applied. Conversely, the application of a north pole will decrease
the output voltage from its quiescent value. This proportionality
is speci
fi
ed as the sensitivity of the device and is de
fi
ned as:
The stability of sensitivity as a function of temperature is
de
fi
ned as:
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
de
fi
ned as:
V
out(q)(V
CC
)
V
out(q)(
V)
=
and the percent ratiometric change in sensitivity is
de
fi
ned 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
fi
elds will not
damage these devices, it will force the output into a non-linear
region. Linearity in percent is measured and de
fi
ned as:
and output symmetry as:
V
out(q)(
Τ)
V
out(q)(
Τ
Α
)
V
out(q)(
25
oC
)
Sens
(
25
oC
)
–
=
(1)
2
B
V
out(–B)
V
out(+B
)
Sens
–
=
Sens
(
Τ)
Sens
(
Τ
Α
)
Sens
(
25
oC
)
Sens
(
25
oC
)
–
=
× 100
%
(2)
(3)
V
CC
÷ 5 V
V
out(q)(5V)
÷
× 100
%
(4)
V
CC
÷ 5 V
÷
=
× 100
%
Sens
(
V
)
Sens
(V
CC
)
Sens
(
5
V
)
(5)
–
=
× 100
%
Lin+
V
out(+B)
2(
V
out(+B / 2)
– V
out(q)
)
V
out(q)
(6)
–
=
× 100
%
Lin–
V
out(–B)
2(
V
out(–B / 2)
– V
out(q)
)
V
out(q)
(7)
–
=
× 100
%
Sym
V
out(+B)
V
out(q)
– V
out(–B)
V
out(q)
(8)
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