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부품번호 | A1304 기능 |
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기능 | Linear Hall-Effect Sensor IC | ||
제조업체 | Allegro | ||
로고 | |||
전체 10 페이지수
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
A1304
Linear Hall-Effect Sensor IC with Analog Output,
Available in a Miniature, Low Profile Surface Mount Package
OPERATING CHARACTERISTICS: valid across TA, CBYPASS = 0.1 µF, VCC = 3.3 V unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
Electrical Characteristics
Supply Voltage
Supply Current
Power-On Time2,3
VCC Ramp Time2,3
VCC Off Level2,3
Internal Bandwidth3
Output Characteristics
VCC
ICC
tPO
tVCC
VCCOFF
BWi
No load on VOUT
TA = 25°C, CL = 10 nF
TA = 25°C
TA = 25°C
Small signal –3 dB
3
–
–
0.005
0
–
–
7.7
50
–
–
20
Output Referred Noise3
VN
A1304ELHLX-T
A1304ELHLX-05-T
TA = 25ºC; CBYPASS =
open; no load on VOUT
–
–
13
13
Input Referred RMS Noise Density3
DC Output Resistance3
Output Load Resistance3
Output Load Capacitance3
Saturation Voltage3
Magnetic Characteristics
Sensitivity4
Sensitivity Temperature Coefficient3
Quiescent Voltage Output (QVO)
Delta QVO
VNRMS
ROUT
RL
CL
VSAT(HIGH)
VSAT(LOW)
A1304ELHLX-T
A1304ELHLX-05-T
TA = 25ºC; CBYPASS =
open; no load on VOUT;
f << BWi
VOUT to GND
VOUT to GND
TA = 25°C, RL = 10 kΩ, (VOUT to GND)
TA = 25°C, RL = 10 kΩ, (VOUT to GND)
–
–
–
4.7
–
2.87
–
Sens
TCSens
VOUT(Q)
∆VOUT(Q)
A1304ELHLX-T
A1304ELHLX-05-T TA = 25ºC
TA = 85°C, relative to Sens at 25°C
TA = 25°C, B = 0 G
A1304ELHLX-T
TA = 85ºC, relative to
A1304ELHLX-05-T QVO at 25ºC
3.76
0.2
0.04
1.625
–
–
2.3
4.6
< 1
–
–
–
–
4.0
0.5
0.12
1.65
±40
±40
Ratiometry Quiescent Voltage Output
Error
Ratiometry Sensitivity Error
Linearity Sensitivity Error
RatVOUT(Q)
RatSens
LinERR
Across specified supply voltage range (relative
to VCC = 3.3 V)
Across specified supply voltage range (relative
to VCC = 3.3 V)
A1304ELHLX-T
Typ. Sensitivity, ±300 G
A1304ELHLX-05-T Typ. Sensitivity, ±2250 G
–
–
–
–
±1.5
±1.5
±1.5
±1.5
Sensitivity Drift Due to
Package Hysteresis
∆SensPKG TA = 25°C, after temperature cycling
– ±2
Magnetic Field Range
A1304ELHLX-T
B Range of Input Field
A1304ELHLX-05-T
– ±375
– ±3000
11 gauss (G) is exactly equal to 0.1 millitesla (mT).
2See Characteristic Definitions section.
3Based on design simulations and/or characterization data. Not tested at Allegro end-of-line.
4Sensitivity drift through the life of the part, ΔSensLIFE , can have a typical error value ±3% in addition to package hysteresis effects.
Max.
3.6
9
70
100
0.33
–
–
–
–
–
–
–
10
–
0.38
4.24
0.8
0.2
1.675
–
–
–
–
–
–
–
–
–
Unit1
V
mA
µs
ms
V
kHz
mV(p–p)
mG / √Hz
Ω
kΩ
nF
V
V
mV/G
% / °C
V
mV
mV
%
%
%
%
G
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
4페이지 A1304
Linear Hall-Effect Sensor IC with Analog Output,
Available in a Miniature, Low Profile Surface Mount Package
Undervoltage Lockout The A1304 provides an undervoltage
lockout feature which ensures that the device outputs a VOUT
signal only when VCC is above certain thresholds . The undervolt-
age lockout feature provides a hysteresis of operation to eliminate
indeterminate output states.
The output of the A1304 is held low (GND) until VCC exceeds
the VCC rising UVLO reset threshold. After that , the device
VOUT output is enabled, providing a ratiometric output volt-
age that is proportional to the input magnetic signal and VCC . If
VCC should drop back down below the VCC falling UVLO trip
threshold after the device is powered up, the output would be
pulled low (see Figure 4) until VCC rising UVLO reset threshold
is reached again and VOUT would be reenabled.
VCC (V)
3.0
VCC(min)
2.8 VCC rising UVLO Reset
2.6
Reduced
perfomance
Undervoltage
Lockout
VOUT (V)
VCC / 2
VOUT is near ground
potential when A1304
is in UVLO state
Reduced
perfomance
VCC falling UVLO trip
Undervoltage
Lockout
t
2.6
VCC falling UVLO trip
2.8 VCC (V)
VCC rising UVLO Reset
Figure 4: UVLO Operation
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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