A1301 - Continuous-Time Ratiometric Linear Hall Effect Sensor ICs

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A1301 기능

기능

Continuous-Time Ratiometric Linear Hall Effect Sensor ICs

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Allegro MicroSystems

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A1301 and A1302

Continuous-Time Ratiometric Linear Hall Effect Sensor ICs

FEATURES AND BENEFITS

• Low-noise output

• Fast power-on time

• Ratiometric rail-to-rail output

• 4.5 to 6.0 V operation

• Solid-state reliability

• Factory-programmed at end-of-line for optimum

performance

• Robust ESD performance

Packages:

3-Pin SOT23W (suffix LH)

3-Pin SIP (suffix UA)

Not to scale

DESCRIPTION

The A1301 and A1302 are continuous-time, ratiometric, linear

Hall-effect sensor ICs. They are optimized to accurately provide

a voltage output that is proportional to an applied magnetic

field. These devices have a quiescent output voltage that is

50% of the supply voltage. Two output sensitivity options

are provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G

typical for the A1302.

The Hall-effect integrated circuit included in each device

includes a Hall circuit, a linear amplifier, and a CMOS Class A

output structure. Integrating the Hall circuit and the amplifier

on a single chip minimizes many of the problems normally

associated with low voltage level analog signals.

High precision in output levels is obtained by internal gain

and offset trim adjustments made at end-of-line during the

manufacturing process.

These features make the A1301 and A1302 ideal for use in

position sensing systems, for both linear target motion and

rotational target motion. They are well-suited for industrial

applications over extended temperature ranges, from –40°C

to 125°C.

Two device package types are available: LH, a 3-pin SOT23W

type for surface mount, and UA, a 3-pin ultramini SIP for

through-hole mount. They are lead (Pb) free (suffix, –T) with

100% matte tin plated leadframes.

V+

VCC

CBYPASS

A1301-DS, Rev. 21

To all subcircuits

Amp

Out

Gain

GND

Offset

Trim

Control

Functional Block Diagram

VOUT

A1301 and

A1302

Continuous-Time Ratiometric

Linear Hall Effect Sensor ICs

CHARACTERISTIC DEFINITIONS

Quiescent Output Voltage

Ratiometric

In the quiescent state (no significant magnetic field: B = 0),

The A1301 and A1302 feature a ratiometric output. This means

the output, VOUTQ, equals one half of the supply voltage, VCC,

throughout the entire operating ranges of VCC and ambient

temperature, TA. Due to internal component tolerances and ther-

mal considerations, there is a tolerance on the quiescent output

voltage, ∆VOUTQ, which is a function of both ∆VCC and ∆TA. For

purposes of specification, the quiescent output voltage as a func-

tion of temperature, ∆VOUTQ(∆TA), is defined as:

that the quiescent voltage output, VOUTQ, and the magnetic sen-

sitivity, Sens, are proportional to the supply voltage, VCC.

The ratiometric change (%) in the quiescent voltage output is

defined as:

∆VOUTQ(∆V) =

VOUTQ(VCC)

VCC

VOUTQ(5V)

× 100%

(4)

∆VOUTQ(∆ΤΑ) =

VOUTQ(ΤΑ) – VOUTQ(25ºC)

Sens(25ºC)

and the ratiometric change (%) in sensitivity is defined as:

(1)

∆Sens(∆V) = Sens(VCC)

Sens(5V)

× 100%

(5)

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

VCC 5 V

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

perature range.

Linearity and Symmetry

Sensitivity

The on-chip output stage is designed to provide linear output at

a supply voltage of 5 V. Although the application of very high

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

dicular 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 sensitiv-

ity of the device and is defined as:

Sens =

VOUT(–B) – VOUT(+B)

(2)

magnetic fields does not damage these devices, it does force

their output into a nonlinear region. Linearity in percent is mea-

sured and defined as:

Lin+ =

VOUT(+B) – VOUTQ

2 (VOUT(+B½) – VVOUTQ )

× 100%

Lin– =

VOUT(–B) – VOUTQ

× 100%

2(VOUT(–B½) – VOUTQ)

(6)

(7)

The stability of the device magnetic sensitivity as a function of

and output symmetry as:

ambient temperature, ∆Sens (∆TA) (%) is defined as:

∆Sens(∆ΤΑ)=

Sens(ΤΑ) – Sens(25ºC)

Sens(25ºC)

× 100%

(3)

Sym =

VOUT(+B) – VOUTQ

VOUTQ – VOUT(–B)

× 100%

(8)

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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A1301 and

A1302

Continuous-Time Ratiometric

Linear Hall Effect Sensor ICs

2.90+–00..2100

CUSTOMER OUTLINE DRAWINGS

2.98+–00..0182

1.49

For Reference Only – Not for Tooling Use

(Reference DWG-2840)

Dimensions in millimeters – NOT TO SCALE

Dimensions exclusive of mold ﬂash, gate burrs, and dambar protrusions

Exact case and lead conﬁguration at supplier discretion within limits shown

4°±4°

0.180+–00..005230

0.96 D

1.91+–00..0169

0.55 REF

8X 10° REF

Branded Face

0.25 BSC

2.40

0.70

0.25 MIN

1.00

Seating Plane

Gauge Plane

0.95

B PCB Layout Reference View

1.00 ±0.13

NNN

0.95 BSC

0.05

+0.10

–0.05

0.40 ±0.10

C Standard Branding Reference View

N = Last three digits of device part number

A Active Area Depth, 0.28 mm

B Reference land pattern layout

All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary

to meet application process requirements and PCB layout tolerances

C Branding scale and appearance at supplier discretion

D Hall elements, not to scale

Figure 1: Package LH, 3-Pin; (SOT-23W)

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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