A1360, A1361,
and A1362
Symmetry Sensitivity Error The magnetic sensitivity of an 
A136x device is constant for any two applied magnetic fields of
equal magnitude and opposite polarities.
Symmetry error, Sym
ERR
 (%), is measured and defined as:
Sens
BPOS
Sens
BNEG
1
Sym
ERR
=
?SPAN class="pst A1361LKTTN-T_2172721_2"> 
100% ,
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
(12)
where Sens
Bx
 is as defined in equation 4, and B
POS
 and B
NEG
 are
positive and negative magnetic fields such that |B
POS
| = |B
NEG
|.
Note that the symmetry error specification is only valid for bipolar
devices.
Ratiometry Error The A136x devices feature ratiometric output. 
This means that the quiescent voltage output, V
OUT(Q)
, magnetic
sensitivity, Sens, and clamp voltage, V
CLP(HIGH)
 and V
CLP(LOW)
,
are proportional to the supply voltage, V
CC
. 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, Rat
ERRVOUT(Q)
 
(%), for a given supply voltage, V
CC
, is defined as:
V
OUT(Q)(VCC)
 / V
OUT(Q)(5V)
V
CC
 / 5 V
1
Rat
ERRVOUT(Q)
=
?SPAN class="pst A1361LKTTN-T_2172721_2"> 
100%.
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
(13)
The ratiometric error in magnetic sensitivity, Rat
ERRSENS
 (%), for
a given supply voltage, V
CC
, is defined as:
Sens
(VCC)
 / Sens
(5V)
V
CC
 / 5 V
1
Rat
ERRSENS
=
?SPAN class="pst A1361LKTTN-T_2172721_2"> 
100% .
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
(14)
The ratiometric error in the clamp voltages, Rat
ERRCLP
 (%), for a
given supply voltage, V
CC
, is defined as:
V
CLP(VCC)
 / V
CLP(5V)
V
CC
 / 5 V
1
Rat
ERRCLP
=
?SPAN class="pst A1361LKTTN-T_2172721_2"> 
100%
,
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
(15)
where V
CLP
 is either V
CLP(HIGH)
 or V
CLP(LOW)
.
Low-Noise Programmable Linear Hall Effect Sensor ICs with
Adjustable Bandwidth (50 kHz Maximum) and Analog Output
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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