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A1425LK Datasheet

  • A1425LK

  • High Accuracy Analog Speed Sensor with Integrated Filter Cap...

  • 12頁

  • ALLEGRO   ALLEGRO

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Preliminary Data Sheet
Subject to Change Without Notice
November 10, 2004
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor
and Dual Zero-Crossing Output Signal
The A1425 ac-coupled Hall-effect sensor is a monolithic integrated circuit that
switches in response to changing differential magnetic
鏗?/div>
elds created by rotating
ring magnets or, when coupled with a magnet, by ferrous targets. The device is a
true zero-crossing detector: the output switches precisely when the difference in
magnetic
鏗?/div>
eld strength between the two Hall elements is zero. A unique dual-
comparator scheme provides for accurate switching during zero-crossing, both
when the sensed
鏗?/div>
eld is increasing in strength and when it is decreasing, while
utilizing hysteresis to prevent false switching. The zero-crossing nature of this
device provides excellent repeatability for crankshaft applications.
Changes in
鏗?/div>
eld strength at the device face caused by a moving target are sensed
by the two integrated Hall transducers, generating signals that are differen-
tially ampli鏗乪d by on-chip electronics. This differential sensing design provides
immunity to radial vibration within the operating air gap range of the A1425, by
rejection of the common mode signal. Steady-state magnet and system offsets are
eliminated using an on-chip differential band-pass
鏗?/div>
lter. This
鏗?/div>
lter also provides
relative immunity to interference from electromagnetic sources.
The device utilizes advanced temperature compensation for the high-pass
鏗?/div>
lter,
sensitivity, and the Schmitt trigger switchpoints, guaranteeing optimal operation to
low frequencies over a wide range of air gaps and temperatures.
Each Hall effect digital integrated circuit includes a voltage regulator, two Hall
effect sensing elements, temperature compensating circuitry, a low-level ampli-
鏗?/div>
er, band-pass
鏗?/div>
lter, Schmitt trigger, and an output driver. The on-board regulator
permits operation with supply voltages from 4.0 to 26.5 V. The output stage can
easily switch 20 mA over the full frequency response range of the sensor, and is
compatible with both TTL and CMOS logic circuits.
The device is packaged in a 4-pin plastic SIP (part number suf鏗亁
-K).
Package K, 4-pin SIP
1
2
3
4
1. VCC
2. VOUT
3. Test pin, tie to GND
4. GND
Features and Bene鏗乼s
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Senses motion of ring magnet targets
Integrated
鏗?/div>
lter capacitor
Wide operating temperature range
Operation with frequency of sensed transitions from 20 Hz to 30 kHz
EMI-resistant
Large working air gaps
4.0 to 26.5 V operating range
Output compatible with both TTL and CMOS logic families
Reverse battery protection
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..........................................
28 V
Reverse-Supply Voltage, V
RCC
........................
鈥?8 V
Output Current, I
OUT
.......................................25
mA
Reverse-Output Current, I
ROUT
.....................鈥?0
mA
Reverse-Output Voltage, V
ROUT
...................鈥?0
mA
Operating Temperature
Ambient, T
A
................................
鈥?0潞C to 150潞C
Maximum Junction, T
J(max)
........................165潞C
Storage Temperature, T
S
..................
鈥?5潞C to 170潞C
Use the following complete part number when ordering:
Part Number
A1425LK
Package
4-pin plastic SIP
Ambient (潞C)
鈥?0 to 150
Engineering samples available on a limited basis. Contact your local
sales or applications support of鏗乧e for additional information.
A1425-DS Rev. 0b
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

A1425LK 產(chǎn)品屬性

  • 500

  • 傳感器，轉(zhuǎn)換器

  • 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC)

  • -

  • 11G 跳閘，-11G 釋放

  • 專用型

  • 4 V ~ 26.5 V

  • 7mA

  • 25mA

  • 數(shù)字，開路集電極

  • 高精度

  • -40°C ~ 150°C

  • 4-SIP

  • 4-SIP

  • 散裝

A1425LK相關(guān)型號PDF文件下載

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  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO
  • 英文版
    High Accuracy Analog Speed Sensor with Integrated Filter Cap...
    ALLEGRO [A...
  • 英文版
    High Precision Hall Effect AC-Coupled Differential Sensor wi...
    ALLEGRO [A...
  • 英文版
    DIP PLUG PITCH:2.54mm
    DBLECTRO [...
  • 英文版
    DIP PLUG PITCH:2.54mm
    DBLECTRO [...
  • 英文版
    DIP PLUG PITCH:2.54mm
    DBLECTRO [...

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