A1324 [ALLEGRO]
Low Noise, Linear Hall Effect Sensor ICs with Analog Output; 低噪声，线性霍尔效应传感器IC，具有模拟输出
| 型号： | A1324 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Low Noise, Linear Hall Effect Sensor ICs with Analog Output |
| 文件： | 总12页 (文件大小：286K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A1324, A1325, and A1326
Low Noise, Linear Hall Effect Sensor ICs with Analog Output
Description
Features and Benefits
New applications for linear output Hall-effect devices, such
as displacement, angular position, and current measurement,
require high accuracy in conjunction with small package size.
The Allegro® A1324, A1325, and A1326 linear Hall-effect
sensorICsaredesignedspecificallytoachievebothgoals.This
temperature-stable device is available in a miniature surface
mount package (SOT23W) and an ultra-mini through-hole
single in-line package.
• Temperature-stable quiescent output voltage and sensitivity
• Output voltage proportional to magnetic flux density
• Low-noise output increases accuracy
• Precise recoverability after temperature cycling
• Ratiometric rail-to-rail output
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Solid-state reliability
• Enhanced EMC performance for stringent automotive
applications
These ratiometric Hall effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. They
featureaquiescentvoltageoutputof50%ofthesupplyvoltage.
The A1324/25/26 feature factory programmed sensitivities of
5.0 mV/G, 3.125 mV/G, and 2.5 mV/G, respectively.
Packages
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
The features of these linear devices make them ideal for use in
automotiveandindustrialapplicationsrequiringhighaccuracy,
and are guaranteed through an extended temperature range,
–40°C to 150°C.
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
sensitivity drift of the Hall element, a small-signal high-gain
amplifier, a clamped low-impedance output stage, and a
proprietary dynamic offset cancellation technique.
These devices are available in a 3-pin ultra-mini SIP package
(UA),anda3-pinsurfacemountSOT-23stylepackage(LH).Both
are lead (Pb) free, with 100% matte tin leadframe plating.
Approximate footprint
Functional Block Diagram
V+
To All Subcircuits
VCC
VOUT
Sensitivity and
Sensitivity TC
Offset
Trim Control
GND
A1324-DS, Rev. 1
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Selection Guide
Sensitivity (Typ.)
Part Number
Packing1
Package
(mV/G)
A1324LLHLX-T
A1324LUA-T2
A1325LLHLX-T
A1325LUA-T2
A1326LLHLX-T
10 000 pieces per reel
3-pin SOT-23W surface mount
5.000
3.125
2.500
500 pieces per bag
10 000 pieces per reel
500 pieces per bag
10 000 pieces per reel
500 pieces per bag
3-pin ultramini SIP through hole mount
3-pin SOT-23W surface mount
3-pin ultramini SIP through hole mount
3-pin SOT-23W surface mount
A1326LUA-T2
3-pin ultramini SIP through hole mount
®
1Contact Allegro for additional packing options.
2Contact factory for availability.
Absolute Maximum Ratings
Characteristic
Symbol
VCC
Notes
Rating
Unit
V
Forward Supply Voltage
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Output Source Current
Output Sink Current
8
–0.1
VRCC
V
VOUT
15
V
VROUT
–0.1
V
IOUT(SOURCE) VOUT to GND
2
mA
mA
ºC
ºC
ºC
IOUT(SINK)
TA
VCC to VOUT
10
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
L temperature range
–40 to 150
165
TJ(max)
Tstg
–65 to 170
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Unit
Package LH, on 4-layer PCB with copper limited to solder pads
228
110
165
ºC/W
ºC/W
ºC/W
Package LH, on 2-layer PCB with 0.463 in.2 of copper area each
side, connected by thermal vias
Package Thermal Resistance
RθJA
Package UA, on 1-layer PCB with copper limited to solder pads
*Additional thermal information available on the Allegro website
Pin-out Diagrams
3
Terminal List Table
Number
Name
Function
LH
UA
Input power supply; tie to GND with
bypass capacitor
VCC
1
1
Output signal; also used for
programming
VOUT
GND
2
3
3
2
Ground
1
2
3
1
2
LH Package
UA Package
Allegro MicroSystems, Inc.
115 Northeast Cutoff
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
OPERATING CHARACTERISTICS Valid throughout TA range, CBYPASS = 0.1 μF, VCC = 5 V; unless otherwise noted
Characteristics
Electrical Characteristics
Supply Voltage
Symbol
Test Conditions
Min.
Typ.
Max.
Unit1
VCC
ICC
tPO
VZ
4.5
–
5.0
6.9
32
5.5
9
V
mA
μs
Supply Current
No load on VOUT
Power-On Time2
TA = 25°C, CL (PROBE) = 10 pF
TA = 25°C, ICC = 12 mA
Small signal, –3 dB
TA = 25°C
–
–
Supply Zener Clamp Voltage
Internal Bandwidth
6
8.3
17
–
V
BWi
fC
–
–
kHz
kHz
Chopping Frequency3
Output Characteristics
Quiescent Voltage Output
–
400
–
VOUT(Q)
B = 0 G, TA = 25°C
2.425
2.500
7.0
2.575
V
A1324, TA = 25°C, CBYPASS = 0.1 μF
A1325, TA = 25°C, CBYPASS = 0.1 μF
A1326, TA = 25°C, CBYPASS = 0.1 μF
–
–
–
–
–
–
mV(p-p)
mV(p-p)
mV(p-p)
Output Referred Noise
VN
4.4
3.5
TA = 25°C, CBYPASS = open, no load on VOUT,
f << BWi
Input Referred RMS Noise Density
DC Output Resistance
VNRMS
ROUT
–
1.3
–
mG/√Hz
–
4.7
4.7
–
< 1
–
–
–
Ω
kΩ
kΩ
nF
V
VOUT to VCC
Output Load Resistance
Output Load Capacitance
Output Saturation Voltage
Magnetic Characteristics
RL
VOUT to GND
–
–
CL
VOUT to GND
–
10
–
VOUT(sat)HIGH
RPULLDOWN = 4.7 kΩ, VCC = 5 V
4.7
–
–
VOUT(sat)LOW RPULLUP = 4.7 kΩ, VCC = 5 V
–
0.30
V
A1324, TA = 25°C
4.750
2.969
2.375
5.000
3.125
2.500
5.250
3.281
2.625
mV/G
mV/G
mV/G
Sensitivity
Sens
A1325, TA = 25°C
A1326, TA = 25°C
LH package; programmed at TA = 150°C,
calculated relative to Sens at 25°C
–
–
0
–
–
%/°C
%/°C
Sensitivity Temperature Coefficient
TCSens
UA package; programmed at TA = 150°C,
calculated relative to Sens at 25°C
0.03
Error Components
LH package; from hot to room temperature
UA package; from hot to room temperature
LH package; from cold to room temperature
UA package; from cold to room temperature
–5
–2.5
–3.5
–6
–
–
–
–
5
%
%
%
%
Sensitivity Drift at Maximum Ambient
Operating Temperature
∆Sens(TAmax)
∆Sens(TAmin)
7.5
8.5
4
Sensitivity Drift at Minimum Ambient
Operating Temperature
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
OPERATING CHARACTERISTICS (continued) Valid throughout TA range, CBYPASS = 0.1 μF, VCC = 5 V; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit1
Error Components (continued)
Quiescent Voltage Output Drift
Through Temperature Range
∆VOUT(Q)
Defined in terms of magnetic flux density, B
–10
–
10
G
Linearity Sensitivity Error
Symmetry Sensitivity Error
LinERR
–1.5
–1.5
–
–
1.5
1.5
%
%
SymERR
Ratiometry Quiescent Voltage
Output Error4
Throughout guaranteed supply voltage range
(relative to VCC = 5 V)
RatVOUT(Q)
–1.3
–1.5
–2
–
–
1.3
1.5
2
%
%
%
%
Throughout guaranteed supply voltage range
(relative to VCC = 5 V), TA = 25°C and 150°C
Ratiometry Sensitivity Error4
RatSens
Throughout guaranteed supply voltage range
(relative to VCC = 5 V), TA = –40°C
–
Sensitivity Drift Due to Package
Hysteresis
∆SensPKG
TA = 25°C, after temperature cycling
–
±2
–
11 G (gauss) = 0.1 mT (millitesla).
2See Characteristic Definitions section.
3fC varies up to approximately ±20% over the full operating ambient temperature range and process.
4Percent change from actual value at VCC = 5 V, for a given temperature.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
4
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Characteristic Definitions
age from its quiescent value. This proportionality is specified
as the magnetic sensitivity, Sens (mV/G), of the device and is
defined as:
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 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).
VOUT(B+) – VOUT(B–)
Sens
=
(2)
B(+) – B(–)
where B(+) and B(–) are two magnetic fields with opposite
polarities.
V
VCC
VCC(typ.)
VOUT
Sensitivity Temperature Coefficient The device sensitivity
changes with temperature, with respect to its sensitivity tem-
perature coefficient, TCSENS. TCSENS is programmed at 150°C,
and calculated relative to the nominal sensitivity programming
temperature of 25°C. TCSENS (%/°C) is defined as:
90% VOUT
VCC(min.)
tPO
SensT2 – SensT1
1
t1
t2
100%
TCSens
=
×
(3)
SensT1
T2–T1
t1= time at which power supply reaches
minimum specified operating voltage
where T1 is the nominal Sens programming temperature of 25°C,
and T2 is the TCSENS programming temperature of 150°C.
t2= time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
The ideal value of sensitivity through the temperature range,
SensIDEAL(TA), is defined as:
0
+t
SensT1 × (100% + TCSENS(TA –T1)
=
)
SensIDEAL(TA)
(4)
Quiescent Voltage Output In the quiescent state (that is, with
no significant magnetic field: B = 0), the output, VOUT(Q), equals
a ratio of the supply voltage, VCC , throughout the entire operat-
ing range of VCC and the ambient temperature, TA.
Sensitivity Drift Through Temperature Range Second
order sensitivity temperature coefficient effects cause the mag-
netic sensitivity to drift from its ideal value through the operating
ambient temperature, TA. For purposes of specification, the sensi-
tivity drift through temperature range, ∆SensTC, is defined as:
Quiescent Voltage Output Drift Through Temperature
Range Due to internal component tolerances and thermal con-
siderations, the quiescent voltage output, VOUT(Q), may drift from
its nominal value through the operating ambient temperature
range, TA. For purposes of specification, the Quiescent Voltage
Output Drift Through Temperature Range, ∆VOUT(Q) (mV), is
defined as:
SensTA – SensIDEAL(TA)
∆SensTC
=
100%
(5)
×
SensIDEAL(TA)
Sensitivity Drift Due to Package Hysteresis Package
stress and relaxation can cause the device sensitivity at TA = 25°C
to change during or after temperature cycling. This change in
sensitivity follows a hysteresis curve.
(1)
V
OUT(Q)TA – VOUT(Q)25°C
∆VOUT(Q)
=
For purposes of specification, the Sensitivity Drift Due to Pack-
age Hysteresis, ∆SensPKG , is defined as:
Sensitivity The presence of a south-polarity magnetic field
perpendicular to the branded surface of the package increases the
output voltage from its quiescent value toward the supply voltage
rail. The amount of the output voltage increase is proportional
to the magnitude of the magnetic field applied. Conversely, the
application of a north polarity field will decrease the output volt-
Sens(25°C)2 – Sens(25°C)1
∆SensPKG
100%
=
×
(6)
Sens(25°C)1
where Sens(25°C)1 is the programmed value of sensitivity at
Allegro MicroSystems, Inc.
115 Northeast Cutoff
5
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
TA = 25°C, and Sens(25°C)1 is the value of sensitivity at TA = 25°C
after temperature cycling TA up to 150°C, down to –40°C, and
back to up 25°C.
Symmetry Sensitivity Error The magnetic sensitivity of a
device is constant for any two applied magnetic fields of equal
magnitude and opposite polarities.
Symmetry Error (%), is measured and defined as:
Linearity Sensitivity Error The 132x 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 sensitivity error is present when there
is a difference between the sensitivities measured at B1 and B2.
Sens
B(+)
1–
SymERR
(11)
=
100%
×
SensB(–)
where SensBx is defined as in equation 9, and B(+), B(–) are posi-
tive and negative magnetic fields such that |B(+)| = |B(–)|.
Ratiometry Error The A132x features a ratiometric output.
This means that the quiescent voltage output, VOUT(Q), magnetic
sensitivity, Sens, and clamp voltages, VCLPHIGH and VCLPLOW
are proportional to the supply voltage, VCC. 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.
Linearity Sensitivity Error is calculated separately for the positive
(LINERR+) and negative (LINERR–) applied magnetic fields. Lin-
earity Sensitivity Error (%) is measured and defined as:
,
Sens
B(++)
1–
LinERR+
=
=
100%
100%
×
×
SensB(+)
Sens
B(– –)
(7)
1–
LinERR–
SensB(–)
The ratiometric error in quiescent voltage output, RatVOUT(Q)
(%), for a given supply voltage, VCC, is defined as:
and
LinERR = max(|LinERR+| , |LinERR–| )
(8)
(9)
VOUT(Q)VCC c V
OUT(Q)5V
1–
(12)
RatVOUT(Q)
=
100%
where:
×
VCC c ꢀ V
|VOUT(Bx) – VOUT(Q)
|
The ratiometric error in magnetic sensitivity, RatSENS (%), for a
given supply voltage, VCC, is defined as:
SensBx
=
BX
and B(++), B(+), B(––), and B(–) are positive and negative mag-
netic fields with respect to the quiescent voltage output such that
|B(++)| > |B(+)| and |B(––)| > |B(–)| .
SensVCC c Sens
VCC c ꢀ V
5V
1–
RatVOUT(Q)
(13)
=
100%
×
Allegro MicroSystems, Inc.
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Typical Characteristics
(30 pieces, 3 fabrication lots)
Average Supply Current versus Ambient Temperature
V
= 5 V
CC
12
11
10
9
8
7
6
5
4
– 40
25
150
T
A (°C)
Average Postive Linearity versus Ambient Temperature
Average Negative Linearity versus Ambient Temperature
V
= 5 V
V
= 5 V
CC
CC
105
104
103
102
101
100
99
105
104
103
102
101
100
99
98
98
97
97
96
96
95
95
– 40
25
150
– 40
25
150
TA (°C)
TA (°C)
Average Quiescent Voltage Output Ratiometry versus Ambient Temperature
Average Sensitivity Ratiometry versus Ambient Temperature
101.0
102.0
101.5
101.0
100.5
100.0
99.5
100.8
VCC
VCC
100.6
100.4
100.2
100.0
99.8
5.5 to 5.0 V
4.5 to 5.0 V
5.5 to 5.0 V
4.5 to 5.0 V
99.6
99.0
99.4
98.5
99.2
99.0
98.0
– 40
25
150
– 40
25
150
T
A (°C)
TA (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
7
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Typical Characteristics, continued
(30 pieces, 3 fabrication lots)
Average Absolute Quiescent Voltage Output versus Ambient Temperature
Quiescent Voltage Output versus Supply Voltage
V
= 5 V
T
= 25°C
CC
A
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
2.565
2.545
2.525
2.505
2.485
2.465
2.445
2.425
A1324
A1325
A1326
A1324
A1325
A1326
4.5
5
5.5
– 40
25
150
V
CC (V)
T
A (°C)
Average Absolute Sensitivity versus Ambient Temperature
= 5 V
Average Sensitivity versus Supply Voltage
V
T
= 25°C
CC
A
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
A1324
A1324
A1325
A1326
A1325
A1326
– 40
25
150
4.5
5
5.5
VCC (V)
TA (°C)
Average Quiescent Voltage Output Drift versus Ambient Temperature
∆V values relative to 25°C, V = 5 V
Average Sensitivity Drift versus Ambient Temperature
∆Sens values relative to 25°C, V = 5 V
OUT(Q)av
CC
av
CC
10
8
10
8
6
6
4
4
2
2
0
0
-2
-4
-6
-8
-10
-2
-4
-6
-8
-10
– 40
25
150
– 40
25
150
T
A (°C)
T
A (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
8
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
V+
VOUT
1[1]
2[3]
VCC
VOUT
A132x
C
BYPASS
0.1 μF
GND
3[2]
Pin numbers in brackets
refer to the UA package
Typical Application Circuit
Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for
then can pass through a low-pass filter, while the modulated DC
offset is suppressed. In addition to the removal of the thermal and
stress related offset, this novel technique also reduces the amount
of thermal noise in the Hall IC while completely removing the
modulated residue resulting from the chopper operation. The
chopper stabilization technique uses a high frequency sampling
clock. For demodulation process, a sample-and-hold technique
is used. This high-frequency operation allows a greater sampling
rate, which results in higher accuracy and faster signal-processing
capability. This approach desensitizes the chip to the effects
of thermal and mechanical stresses, and produces devices that
have extremely stable quiescent Hall output voltages and precise
recoverability after temperature cycling. This technique is made
possible through the use of a BiCMOS process, which allows the
use of low-offset, low-noise amplifiers in combination with high-
density logic integration and sample-and-hold circuits.
switchpoint accuracy is the small signal voltage developed across
the Hall element. This voltage is disproportionally small relative
to the offset that can be produced at the output of the Hall IC.
This makes it difficult to process the signal while maintaining an
accurate, reliable output over the specified operating temperature
and voltage ranges. Chopper stabilization is a unique approach
used to minimize Hall offset on the chip. Allegro employs a
patented technique to remove key sources of the output drift
induced by thermal and mechanical stresses. This offset reduc-
tion technique is based on a signal modulation-demodulation
process. The undesired offset signal is separated from the
magnetic field-induced signal in the frequency domain, through
modulation. The subsequent demodulation acts as a modulation
process for the offset, causing the magnetic field-induced signal
to recover its original spectrum at baseband, while the DC offset
becomes a high-frequency signal. The magnetic-sourced signal
Regulator
Clock/Logic
Hall Element
Amp
Anti-Aliasing
LP Filter
Tuned
Filter
Concept of Chopper Stabilization Technique
Allegro MicroSystems, Inc.
115 Northeast Cutoff
9
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Package LH, 3-Pin SOT23W
+0.12
–0.08
2.98
D
1.49
+4°
–0°
4°
3
A
+0.020
–0.053
0.180
D
0.96
D
+0.10
–0.20
+0.19
1.91
–0.06
2.40
2.90
0.70
0.25 MIN
1.00
2
1
0.55 REF
0.25 BSC
0.95
PCB Layout Reference View
Seating Plane
Gauge Plane
B
Branded Face
8X 10° REF
1.00 ±0.13
+0.10
NNN
1
0.05
–0.05
C
Standard Branding Reference View
0.95 BSC
0.40 ±0.10
N = Last three digits of device part number
For Reference Only; not for tooling use (reference DWG-2840)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
Active Area Depth, 0.28 mm REF
A
B
Reference land pattern layout
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
C
D
Branding scale and appearance at supplier discretion
Hall element, not to scale
Allegro MicroSystems, Inc.
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Package UA, 3-Pin SIP
+0.08
4.09
–0.05
45°
B
C
E
2.05 NOM
1.52 ±0.05
10°
1.44 NOM
E
E
Mold Ejector
Pin Indent
+0.08
–0.05
3.02
45°
Branded
Face
NNN
0.79 REF
A
1.02
MAX
1
Standard Branding Reference View
D
= Supplier emblem
N = Last three digits of device part number
1
2
3
14.99 ±0.25
+0.03
–0.06
0.41
For Reference Only; not for tooling use (reference DWG-9065)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusio
Exact case and lead configuration at supplier discretion within limits s
+0.05
–0.07
0.43
Dambar removal protrusion (6X)
A
B
C
D
Gate and tie bar burr area
Active Area Depth, 0.50 mm REF
Branding scale and appearance at supplier discretion
Hall element (not to scale)
E
Allegro MicroSystems, Inc.
115 Northeast Cutoff
11
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1324, A1325,
and A1326
Linear Hall Effect Sensor ICs with Analog Output
Revision History
Revision
Revision Date
Description of Revision
Rev. 1
October 11, 2011
Update Sensitivity specifications
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