Datasheet > A1425_05

A1425_05

更新时间： 2024-09-25 03:16:11

品牌	Logo	应用领域
急速微 - ALLEGRO		传感器电容器
页数	文件大小	规格书
13页	807K
描述
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal

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A1425_05 数据手册

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 fields created by rotating

ring magnets and, when coupled with a magnet, by ferrous targets. The device is

a true zero-crossing detector: the output switches precisely when the difference in

Package K, 4-pin SIP

magnetic field strength between the two Hall elements is zero. A unique dual-com-

parator scheme provides for accurate switching at the zero crossing on both the

positive and negative-going regions of the differential signal, while utilizing hys-

teresis to prevent false switching. The zero-crossing nature of this device provides

excellent repeatability and accuracy for crankshaft applications.

Changes in field strength at the device face, which are induced by a moving

target, are sensed by the two integrated Hall transducers. The transducers generate

signals that are differentially amplified 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 filter.

This filter also provides relative immunity to interference from electromagnetic

sources.

The device utilizes advanced temperature compensation for the high-pass filter,

sensitivity, and Schmitt trigger switchpoints, to guarantee 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 amplifier,

band-pass filter, Schmitt trigger, and an output driver, which requires a pull-up

resistor. 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.

1. VCC

2. VOUT

3. TEST

4. GND

The device is packaged in a 4-pin plastic SIP. The lead (Pb) free version (suffix

–T) has a 100% matte tin plated leadframe.

Features and Beneﬁts

ABSOLUTE MAXIMUM RATINGS

Supply Voltage*, V_CC........................................28 V

Reverse-Supply Voltage, V_RCC........................–18 V

Continuous Output Current, I_OUT...................25 mA

Continuous Reverse-Output Current, I_ROUT.–50 mA

Operating Temperature

Ambient, T_A................................–40ºC to 150ºC

Maximum Junction, T_J(max)........................165ºC

Storage Temperature, T_S..................–65ºC to 170ºC

*Refer to Power Derating section.

• Senses motion of ring magnet or ferrous targets

• Integrated filter capacitor

• Wide operating temperature range

• Operation with magnetic input signal frequency from 20 Hz to 20 kHz

• Resistant to EMI

• Large effective air gaps

• 4.0 to 26.5 V supply operating range

• Output compatible with both TTL and CMOS logic families

• Reverse battery protection

• Resistant to mechanical and thermal stress

• Accurate true zero crossing switchpoint

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

A1425a-DS

12 3 4 5 6 7...13

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与A1425_05相关器件

型号	品牌	获取价格	描述	数据表
A1425A	MICROSEMI	获取价格	Accelerator Series FPGAs â ACT 3 Family
A1425A-1CQ132B	ACTEL	获取价格	Highly Predictable Performance with 100% Automatic Placement and Routing
A1425A-1CQ132C	ACTEL	获取价格	Field Programmable Gate Array, 310 CLBs, 7500 Gates, 125MHz, 310-Cell, CMOS, CQFP132, CERA
A1425A-1CQ132E	ACTEL	获取价格	Field Programmable Gate Array, 310 CLBs, 2500 Gates, 125MHz, CMOS, CQFP132, CAVITY-UP, CER
A1425A-1CQ132M	ACTEL	获取价格	Field Programmable Gate Array, 310 CLBs, 7500 Gates, 125MHz, 310-Cell, CMOS, CQFP132, CERA
A1425A-1CQ256B	ACTEL	获取价格	HiRel FPGAs
A1425A-1CQ256C	ACTEL	获取价格	HiRel FPGAs
A1425A-1CQ256E	ACTEL	获取价格	HiRel FPGAs
A1425A-1CQ256M	ACTEL	获取价格	HiRel FPGAs
A1425A-1CQG132B	ACTEL	获取价格	Field Programmable Gate Array, 310 CLBs, 7500 Gates, 125MHz, CMOS, CQFP132, CERAMIC, CQFP-

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