A1421 データシートの表示（PDF） - Allegro MicroSystems

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A1421

High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor

Allegro MicroSystems 

A1421, A1422,

and A1423

High Precision Hall Effect AC-Coupled Differential

Sensor IC with Integrated Filter Capacitor

THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information

Characteristic

Symbol

Test Conditions*

Package Thermal Resistance

RθJA Minimum-K PCB (single-sided with copper limited to solder pads)

*In still air. Additional thermal information available on Allegro Web site.

Value Units

177 ºC/W

Power Derating Curve

TJ(max) = 165°C; ICC = ICC(max)

30

28

26

VCC(max)

24

22

20

18

16

14

12

Minimum-K PCB

10

(RQJA = 177 ºC/W)

8

6

4

VCC(min)

2

0

20 40 60 80 100 120 140 160 180

Definitions of Terms

Maximum Power Dissipation

TJ(max) = 165°C; ICC = ICC(max); VCC = VCC(max)

900

850

800

750

700

650

600

550

500

450

400

(RQMJAin=im1u7m7-ºKCP/WC)B

350

300

250

200

150

100

50

0

20 40 60 80 100 120 140 160 180

Temperature (°C)

The following provide additional information about some of the

parameters cited. For additional information, visit the Allegro

Web site at www.allegromicro.com.

Applied Magnetic Field, Bdiff – The differential magnetic flux

density, which is calculated as the arithmetic difference of the

flux densities observed by each of the two Hall elements. fBdiff is

the input signal frequency.

Output Off Switchpoint (Operate Point), BOP – The value of

increasing differential magnetic flux density at which the device

output switches from low to high (A1421) or high to low (A1422

and A1423).

Output On Switchpoint (Release Point), BRP – The value of

decreasing differential magnetic flux density at which the device

output switches from high to low (A1421) or from low to high

(A1422 and A1423).

Power-On Time, tPO – The time needed by the device, after

power is applied, to initialize all circuitry necessary for proper

operation.

Settling Time, tSettling – The time required by the device, after

tPO, and after a valid magnetic signal has been applied, to

provide proper output transitions. Settling time is a function of

magnetic offset, offset polarity, signal phase, signal frequency,

and signal amplitude.

Supply Current (on), ICC(on) – The current draw of the device

with the output transitor is turned on.

Supply Current (off), ICC(off) – The current draw of the device

with the output transitor is turned off.

Response Time, tResponse – The total time required for generating

zero-crossing output transitions after initialization (the sum of

Power-on Time and Settling Time).

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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