A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS (continued) valid over full operating temperature range, T
A
; C
BYPASS
= 0.1 糉, V
CC
= 5 V, unless otherwise speci ed
Characteristic
Symbol
Test Conditions
Min.   Typ.  Max.  Units
Drift Characteristics
Maximum Sensitivity Drift Through
Temperature Range
14
Sens
TC
    < ?        %
Sensitivity Drift Due to Package Hysteresis
1
Sens
PKG
T
A
= 25癈, after temperature cycling
    < ?        %
Error Components
Linearity Sensitivity Error
15
Lin
ERR
B = 400 G and 200 G, and
B = 400 G and 200 G
   < ?.5       %
Symmetry Sensitivity Error
16
Sym
ERR
B = ?00 G
    < ?        %
1
See Characteristic Definitions section.
2
f
C
varies up to approximately ?0% over the full operating ambient temperature range, T
A
, and process.
3
Measured as 10% to 90% (or 90% to 10%) of the PWM signal.
4
Jitter is dependent on the sensitivity of the device.
5
Raw device characteristic values before any programming.
6
Bit for selecting between D
(Q)UNI
and D
(Q)BI
programming ranges.
7
D
(Q)
(max) is the value available with all programming fuses blown (maximum programming code set). The D
(Q)
range is the total range from
D
(Q)
(init) up to and including D
(Q)
(max). See Characteristic Definitions section. Quiescent Duty Cycle may drift by an additional 0.8% D to 0.3% D over the lifetime of this
product.
8
Step size is larger than required, in order to provide for manufacturing spread. See Characteristic Definitions section.
9
Non-ideal behavior in the programming DAC can cause the step size at each significant bit rollover code to be greater than twice the maximum
specified value of Step
D(Q)
, Step
SENS
, or Step
fPWM
.
10
Overall programming value accuracy. See Characteristic Definitions section.
11
Sens(max) is the value available with all programming fuses blown (maximum programming code set). Sens range is the total range from Sens
init
up
to and including Sens(max). See Characteristic Definitions section. Sensitivity may drift by an additional ?.5% over the lifetime of this product.
12
Programmed at 125癈 and calculated relative to 25癈.
13
PWM Carrier Frequency may drift by an additional ?7 Hz over the lifetime of this product.
14
Sensitivity drift from expected value at T
A
after programming TC
SENS
. See Characteristic Definitions section.
15
Linearity is only guaranteed for output duty cycle ranges of ?0% D from the quiescent output for bidirectional devices and +40% D from the quiescent output for
unidirectional devices. These linearity ranges are only valid within the operating output range of the device. The operating output range is confined to the region between the
output clamps. Linearity may shift by up to ?.25% over the lifetime of this product.
16
Symmetry error is only valid for bipolar devices. Symmetry may shift by up to ?.6% over the lifetime of this product.