A1391 and A1392
Micro Power 3 V Linear Hall Effect Sensor with Tri-State Output and User-Selectable Sleep Mode
Characteristics Definitions
Ratiometric.
The A1391 and A1392 devices feature ratiometric
output. The quiescent voltage output and sensitivity are
proportional to the ratiometric supply reference voltage.
The percent ratiometric change in the quiescent voltage output is
defined as:
ΔV
OUTQ(ΔV)
=
ΔV
OUTQ(V
REF
)
÷
ΔV
OUTQ(3V)
V
REF
÷ 3 V
× 100
%
Linearity and Symmetry.
The on-chip output stage is
designed to provide a linear output with maximum supply voltage
of V
CCN
. Although application of very high magnetic fields will
not damage these devices, it will force the output into a non-lin-
ear region. Linearity in percent is measured and defined as
Lin+ =
V
OUT(+B)
–
V
OUTQ
2(V
OUT(+B / 2)
– V
OUTQ
)
V
OUT(–B)
–
V
OUTQ
2(V
OUT(–B / 2)
– V
OUTQ
)
× 100
%
(1)
(2)
(3)
(4)
and the percent ratiometric change in sensitivity is defined as:
ΔSens
(ΔV)
=
ΔSens
(V
REF
)
÷
ΔSens
(3V)
V
REF
÷ 3 V
Lin– =
× 100%
× 100
%
and output symmetry as
Sym =
V
OUT(+B)
–
V
OUTQ
V
OUTQ
– V
OUT(–B)
× 100
%
(5)
A1391-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
9
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
