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PDF A1304 Data sheet ( Hoja de datos )
| Número de pieza | A1304 | |
| Descripción | Linear Hall-Effect Sensor IC | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A1304
Linear Hall-Effect Sensor IC with Analog Output,
Available in a Miniature, Low Profile Surface Mount Package
FEATURES AND BENEFITS
• 3.3 V supply operation
• Allegro factory programmed offset and sensitivity
• Miniature package
• High bandwidth, low noise analog output
• High speed chopping scheme minimizes QVO drift across
operating temperature range
• Temperature-stable quiescent voltage output and
sensitivity
• Precise recoverability after temperature cycling
• Wide ambient temperature range: –40°C to 85°C
• Immune to mechanical stress
Package: 3-Pin Surface Mount SOT23-W
(suffix LH)
DESCRIPTION
New applications for linear output Hall effect sensors require
medium accuracy and smaller package size. TheAllegroA1304
linear Hall effect sensor IC has been designed specifically to
achieve both goals. This temperature-stable device is available
in a miniature surface mount package (SOT23-W).
This ratiometric Hall effect sensor provides a voltage output
that is proportional to the applied magnetic field and features
a quiescent voltage output of 50% of the supply voltage.
Each BiCMOS monolithic circuit integrates a Hall element,
offset and sensitivity trim circuitry to correct for the variation
in the Hall element, a small-signal high-gain amplifier, and a
proprietary dynamic offset cancellation technique.
The A1304 sensor IC is available in a 3-pin surface mount
SOT-23W style package (LH suffix). The package is lead (Pb)
free, with 100% matte tin leadframe plating.
Approximate footprint
V+
VCC
CBYPASS
A1304-DS, Rev. 1
Sensitivity
Offset
Trim Control
GND
Functional Block Diagram
VOUT
1 page  
A1304
Linear Hall-Effect Sensor IC with Analog Output,
Available in a Miniature, Low Profile Surface Mount Package
CHARACTERISTIC DEFINITIONS
Power On Time When the supply is ramped to its operating
voltage, the device output requires a finite time to react to an
input magnetic field. Power On Time, tPO , is defined as the time
it takes for the output voltage to begin responding to an applied
magnetic field after the power supply has reached its minimum
specified operating voltage, VCC(min), as shown in Figure 1.
Quiescent Voltage Output In the quiescent state (no signifi-
cant magnetic field: B = 0 G), the output, VOUT(Q), is at a con-
stant ratio to the supply voltage, VCC, across the entire operating
ranges of VCC and Operating Ambient Temperature, TA.
Quiescent Voltage Output Drift Across Temperature
Range Due to internal component tolerances and thermal
considerations, the Quiescent Voltage Output, VOUT(Q), may
drift due to temperature changes within the Operating Ambient
Temperature, TA. For purposes of specification, the Quiescent
Voltage Output Drift Across Temperature Range, ∆VOUT(Q) (mV),
is defined as:
Sens
=
VOUT(B+) – VOUT(B–)
(B+) – (B–)
(2)
where B+ is the magnetic flux density in a positive field (south
polarity) and B– is the magnetic flux density in a negative field
(north polarity).
Sensitivity Temperature Coefficient The device sensitivity
changes as temperature changes, with respect to its Sensitivity
Temperature Coefficient, TCSENS. TCSENS is defined as:
TCSens
=
SensSTe2n–sTS1ensT1
×
100
T21–T1
(%/°C) (3)
where T1 is the baseline Sens programming temperature of 25°C,
and T2 is the sensitivity at another temperature.
The ideal value of Sens across the full ambient temperature
range, SensIDEAL(TA), is defined as:
∆VOUT(Q) = VOUT(Q)(TA) –VOUT(Q)(25°C)
(1)
Sensitivity The amount of the output voltage change is propor-
tional to the magnitude and polarity of the magnetic field applied.
This proportionality is specified as the magnetic sensitivity,
Sens (mV/G), of the device and is defined as:
V
VCC(typ)
90% VOUT
VCC
VOUT
VCC(min)
tPO
t1 t2
t1=
time at which power supply reaches
minimum specified operating voltage
t2=
time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
SensIDEAL(TA) = SensT1 × [100 (%) + TCSENS (TA –T1)] (4)
Linearity Sensitivity Error The A1304 is designed to provide
linear output in response to a ramping applied magnetic field.
Consider two magnetic fields, B1 and B2. Ideally, the sensitivity
of a device is the same for both fields, for a given supply voltage
and temperature. Linearity error is present when there is a differ-
ence between the sensitivities measured at B1 and B2.
Linearity Sensitivity Error, LINERR , is calculated separately for
positive (LinERR+) and negative (LinERR– ) applied magnetic
fields. LINERR (%) is measured and defined as:
LinERR+
=
1–
Sens(B+)(2)
Sens(B+)(1)
×100
(%)
(5)
LinERR–
= 1–
SSeennss((BB––))((12)) ×100
(%)
where:
SensBx
=
|VOUT(Bx) –
Bx
VOUT(Q)|
(6)
0 +t
Figure 1: Def inition of Power On Time, tPO
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet A1304.PDF ] | |
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