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參數(shù)資料
| 型號(hào)： | A1425LK |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | 速度傳感器和接近開(kāi)關(guān) |
| 英文描述： | High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal |
| 中文描述： | 高精度模擬集成濾波電容器和雙零速傳感器輸出信號(hào)通道 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 502K |
| 代理商： | A1425LK |
10
A1425-DS Rev. 0b
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
Applications Information
The A1425 is a versatile high-precision differential sensing
device that can be used in a wide range of applications. Proper
choice of the target material and shape, and assembly techniques
enables large working air gaps and high switchpoint accuracy
over the device operating temperature range.
Sensor Operation
The A1425 sensor IC contains two integrated Hall transducers
that are used to differentially sense a magnetic
fi
eld across the
surface of the IC. Referring to
fi
gure 1, the trigger switches the
output off (output high) when the differential magnetic
fi
eld
crosses zero while increasing in strength (referred to a the posi-
tive direction), and switches the output on (output low) when
the differential magnetic
fi
eld crosses zero while decreasing (the
negative direction).
The operation is achieved through the use of two separate com-
parators. Both comparators use the same reference point, 0 G, to
provide high accuracy, but one comparator has a positive hystere-
sis, B
HYS1
, and the other a negative hysteresis, B
HYS2
. Therefore,
one comparator switches at the zero crossing on an increasing
differential signal and the other switches at the zero crossing on a
decreasing differential signal. The hysteresis on each comparator
precludes false switching on noise or target jitter.
Start-up
During power-on time, t
PO
, the output signal, V
OUT
, is high.
Beyond this time, if the applied magnetic
fi
eld, B
diff
, is absent or
less than 50 G peak-to-peak, the switching state and V
OUT
polar-
ity are indeterminate. V
OUT
will be valid for B
diff
> 50 Gp-p,
after the additional settling time, t
S
, has also elapsed.
Also during t
PO
, a circuit in the A1425 is brie
fl
y enabled that
charges the on-chip capacitor. This feature reduces t
PO
, relative
to the long RC time constant of a high-pass
fi
lter.
Delay
The on-chip band-pass
fi
lter induces delay in the output signal,
V
OUT
, relative to the applied magnetic
fi
eld, B
diff
. Simulation
data shown in the Characteristic Data section quantify the effect
of the input signal amplitude on the phase shift of the output.
Figure 1. Typical output characteristics with dual comparator operation. Characteristics shown without delay, see characteristic
data charts for delay and phase shift contributions.
11.0
0.0
–11.0
On
Off
Off
B
RP(typ)
B
HYS2
B
OP(typ)
B
OP(min)
/ B
RP(min)
B
OP(max)
/ B
RP(max)
Output Signal, V
OUT
Switching State
Applied Magnetic
Field, B
diff
Comparator 1
Comparator 2
t+
A
B
HYS1
Preliminary - Subject to Change
Without Notice November 10, 2004
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| A1425LK-T | 功能描述:IC SENSOR HALL EFFECT AC 4-SIP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開(kāi)關(guān)，線性，羅盤(pán) (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| A1425-PQ160C | 制造商:Microsemi SOC Products Group 功能描述: |
| A1428AG1 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:DIP PLUG PITCH:2.54mm |
| A1428AG2 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:DIP PLUG PITCH:2.54mm |
| A1428AS1 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:DIP PLUG PITCH:2.54mm |
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