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Ratiometric Linear Hall Effect Sensor ICs
for High-Temperature Operation
A1321, A1322,
and A1323 
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
MAGNETIC CHARACTERISTICS
1,2
 over operating temperature range, T
A
; V
CC
 = 5 V, I
out
 = 1 mA; unless otherwise noted
Characteristics    Symbol
Test Condition
Min    Typ
3
Max   Units
4
Sensitivity
5
Sens
A1321; T
A
 = 25篊
4.750   5.000   5.250   mV/G
A1322; T
A
 = 25篊
2.969   3.125   3.281   mV/G
A1323; T
A
 = 25篊
2.375   2.500   2.625   mV/G
Delta V
out(q)
 as a func-
tion of temperature
V
out(q)(擳)
De ned in terms of magnetic  ux density, B


?0
G
Ratiometry, V
out(q)
V
out(q)(擵)


?.5    %
Ratiometry, Sens
擲ens
(擵)


?.5    %
Positive Linearity
Lin+


?.5    %
Negative Linearity
Lin


?.5    %
Symmetry
Sym


?.5    %
UA Package
Delta Sens at T
A
 = max
5
擲ens
(TAmax)
From hot to room temperature
2.5
 
7.5
%
Delta Sens at T
A
 = min
5
擲ens
(TAmin)
From cold to room temperature
6
 
4
%
Sensitivity Drift
6
Sens
Drift
T
A
 = 25癈; after temperature cycling and over time   
?

%
LH Package
Delta Sens at T
A
 = max
5
擲ens
(TAmax)
From hot
 
to room temperature
5
 
5
%
Delta Sens at T
A
 = min
5
擲ens
(TAmin)
From cold to room temperature
3.5
 
8.5
%
Sensitivity Drift
6
Sens
Drift
T
A
 = 25癈; after temperature cycling and over time   
?

%
1
 Additional information on characteristics is provided in the section Characteristics De nitions, on the next page.
2
Negative current is de ned as conventional current coming out of (sourced from) the speci ed device terminal.
3
Typical data is at T
A
 = 25癈, except for 擲ens, and at x.x Sens. Typical data are for initial design estimations only, and assume optimum
manufacturing and application conditions. Performance may vary for individual units, within the speci ed maximum and minimum limits.
In addition, the typical values vary with gain.
4
 10 G = 1 millitesla.
5
 After 150篊 pre-bake and factory programming.
6
 Sensitivity drift is the amount of recovery with time.
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