A1373LKB datasheet(14/23 Pages) ALLEGRO

14 / 23 page

A1373-DS, Rev. 3

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

High Precision, Output Pin Programmable, Linear Hall Effect Sensors

A1373 and A1374

Characteristic Definitions

Quiescent Output Voltage.

In the quiescent state (no signifi-

cant magnetic field: B = 0), the output, VOUTQ, equals a ratio of

the supply voltage, VCC, throughout the entire operating ranges

of VCC and ambient temperature, TA. Due to internal compo-

nent tolerances and thermal considerations, however, there is

a tolerance on the quiescent output voltage, ΔVOUTQ, which is

a function of both ΔVCC and ΔTA. For purposes of specifica-

tion, the quiescent output voltage as a function of temperature,

ΔVOUTQ(ΔT

A), is defined as:

where Sens is in mV/G, and the result is the device equivalent

accuracy, in gauss (G), applicable over the entire operating tem-

perature range.

Sensitivity.

The presence of a south-polarity (+B) magnetic

field, perpendicular to the branded face of the device package,

increases the output voltage, VOUT, in proportion to the magnetic

field applied, from VOUTQ toward the VCC rail. Conversely, the

application of a north polarity (–B) magnetic field, in the same

orientation, proportionally decreases the output voltage from its

quiescent value. This proportionality is specified as the magnetic

sensitivity of the device and is defined as:

The stability of the device magnetic sensitivity as a function of

ambient temperature, ΔSens (ΔT

A) (%) is defined as:

Ratiometric.

The A1373 and A1374 feature ratiometric

output. This means that the quiescent voltage output, VOUTQ,

magnetic sensitivity, Sens, and clamp voltage, VOUTCLP, are

proportional to the supply voltage, VCC.

The ratiometric change in the quiescent output voltage,

RATVOUT(Q) (%), is defined as:

the ratiometric change in sensitivity is defined as:

and the ratiometric change in clamp voltage is defined as:

Note that clamping effect is applicable only when clamping is

enabled by programming of the device.

Linearity and Symmetry.

The on-chip output stage is

designed to provide linear output at a supply voltage of 5 V.

Although the application of very high magnetic fields does not

damage these devices, it does force their output into a nonlinear

region. Linearity in percent is measured and defined as:

and output symmetry as:

ΔVOUTQ(ΔΤ

Α)

Sens(25ºC)

VOUTQ(Τ

Α)

VOUTQ(25ºC)

–

(1)

VOUT(–B) VOUT(+B)

Sens

–

ΔSens(ΔΤ

Α)

Sens(Τ

Α)

Sens(25ºC)

–

× 100%

(2)

(3)

VCC

VOUTQ(VCC)

VOUTQ(5V)

RATVOUT(Q) =

× 100%

(4)

VCC 5V

× 100%

RATSens

Sens(VCC)

Sens(5V)

(5)

× 100%

Lin+

2 (VOUT(+B½) –VVOUTQ )

–

VOUT(+B) VOUTQ

(7)

× 100%

Lin–

2(VOUT(–B½) –VOUTQ)

–

VOUT(–B) VOUTQ

(8)

–

× 100%

Sym

VOUT(+B)

VOUTQ –VOUT(–B)

VOUTQ

(9)

RATVCLP

VCC

VCLP(VCC)

VCLP(5V)

× 100%

(6)

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