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A1425 Datasheet(PDF) 3 Page - Allegro MicroSystems

Part No. A1425
Description  High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A1425 Datasheet(HTML) 3 Page - Allegro MicroSystems

 
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A1425-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
OPERATING CHARACTERISTICS Valid at TA = – 40ºC to 150ºC, TJ ≤ 165°C; over operational air gap range and VCC within
operating range, unless otherwise noted. Typical operating parameters: VCC=12 V and TA=25°C.
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
VCC
Operating; TJ < TJ(max)
4.0
26.5
V
Supply Current
ICC
4.2
7.0
mA
Output Saturation Voltage
VOUT(SAT) ISINK = 20 mA
140
400
mV
Output Leakage Current
IOFF
VOUT = 24 V, Bdiff = 0
5
μA
PROTECTION COMPONENT CHARACTERISTICS
Reverse Supply Current
IRCC
VCC = –18 V
–1
mA
Supply Zener Current
IZSupply VS = 28 V
10
mA
Supply Zener Clamp Voltage1
VZSupply ICC = 10 mA, TA = 25°C
28
33
37
V
Output Zener Current
IZOutput VOUT = 28 V
3
mA
Output Zener Clamp Voltage
VZOutput IOUT = 3 mA, TA = 25°C
28
V
Output Short Circuit Current Limit2
IOUTS(lim)
50
mA
RESPONSE CHARACTERISTICS
Power-On State
POS
t < tResponse
High
V
Power-On Time3,7
tPO
VCC > VCC(min)
4.5
9
ms
Settling Time4,7
tSettle
fBdiff ≥ 100 Hz
0
50
ms
Response Time7
tResponse Equal to tPO + tS; fBdiff ≥ 100 Hz
4.5
59
ms
Upper Corner Frequency
fcu
–3 dB, single pole
20
kHz
Lower Corner Frequency
fcl
–3 dB, single pole
20
Hz
OUTPUT CHARACTERISTICS
Output Rise Time5
tr
RPU = 1 kΩ, COUT2 = 10 pF
200
ns
Output Fall Time
tf
RPU = 1 kΩ, ISINK = 20 mA, COUT2 = 10 pF
200
ns
MAGNETIC CHARACTERISTICS
Output Off Switchpoint6,7
BOP
Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p;
digital output signal switches low to high
–11
0
11
G
Output On Switchpoint6,7
BRP
Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p;
digital output signal switches high to low
–11
0
11
G
Applied Magnetic Field7,8
Bdiff
Differential p-p magnetic field
50
1250
G
1I
CC equivalent to ICC(max) + 3 mA.
2IOUT does not change state when IOUT > IOUTS(lim), regardless of changes in the sensed magnetic field..
3Time required to initialize device.
4Time required for the output switchpoints to be within specification.
5Output Rise Time will be dominated by the RC time constant.
6For other sinusoidal signal frequencies and magnetic fields, –BOP = BRP = sinα(Bdiff ⁄ 2) ± 25%, where α is the phase shift shown in the Characteristic
Data section.
7See Definitions of Terms section.
8Exceeding the maximum magnetic field may result in compromised absolute accuracy.


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