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A1469LK-T

Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration

Allegro MicroSystems 

A1469

Three-Wire True Zero-Speed Differential Peak-Detecting

Sensor IC with Continuous Calibration

OPERATING CHARACTERISTICS: valid throughout operating voltage and ambient temperature ranges, typical data ap-

plies at VCC = 12 V and TA = 25°C; unless otherwise specified

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit1

Electrical Characteristics

Supply Voltage2

Undervoltage Lockout

Supply Current

Power-On Characteristics

VCC

VCC(uv)

ICC

Operating, TJ ≤ 165°C

VCC = 0 → VCC(min) + 1 V and

VCC(min) + 1 V → 0 V

VCC > VCC(min)

4

–

26.5

V

–

–

VCC(min)

V

3.0

5.0

7.5

mA

Power-On State

Power-On Time3

Transient Protection Characteristics

POS

tPO

VOUT, connected as in figure 6

VCC > VCC(min)

–

High

–

V

–

–

2.3

ms

Supply Zener Clamp Voltage

Supply Zener Current

VZ(supply) ICC = ICC(max) + 3 mA, TA = 25 °C

IZ(supply) Vsupply = 28 V

28

–

–

V

–

–

ICC(max)

+3

mA

Reverse Supply Current

Output Zener Clamp Voltage

Output Zener Current

Output Current Limit

Output Stage Characteristics

IRCC

VZ(output)

IZ(output)

IOUT(lim)

VRCC = –18 V, TJ < TJ(max)

IOUT = 3 mA, TA = 25°C

VOUT = 28 V

–

–

–1

mA

28

–

–

V

–

–

3

mA

30

–

85

mA

Output Saturation Voltage

Output Leakage Current

Output Fall Time

Performance Characteristics

VOUT(sat)

IOFF

tf

IOUT(sink) = 20 mA

VOUT = 24 V, output off

RPU = 1 kΩ, VPU = 20 V, COUT = 10 pF

–

220

400

mV

–

–

10

µA

–

2

–

µs

Operating Magnetic Signal Range

BDIFF

Peak-to-peak of differential signal; operation

within specification

20

–

1200

G

Operate Point4

BOP

See figure 5

–

120

–

mV

3

–

10

G

Release Point4

BRP

See figure 5

–

120

–

mV

3

–

10

G

Operating Frequency

Analog Signal Bandwidth

fOP

BW Equivalent to f = –3 dB

0

–

10

kHz

20

–

–

kHz

Initial Calibration Cycle5

ncal

Output rising edges before calibration is

completed, 0 offset, fOP ≤ 200 Hz

–

Output Duty Cycle Precision

DOUT

Using a pure sine magnetic signal, with fOP and

BDIFF within specification

–

Output Period Precision

TOUT

Using pure sine magnetic signal with

BDIFF = 50 Gpk-pk and fOP = 1 kHz

–

Allowable User Induced Differential

Offset

BDIFFEXT Output switching only

–

–

3

edge

–

±15

%

0.3

–

%

–

±100

G

11 G (gauss) = 0.1 mT (millitesla).

2Maximum voltage operation must not exceed maximum junction temperature. Refer to Power Derating Curves chart.

3Time required to initialize device. Power-On Time includes the time required to complete the internal automatic offset adjust. The DAC is then ready for peak acquisition.

4Values in G are based on device in maximum gain setting.

5Non-uniform magnetic profiles may require additional output pulses before calibration is complete.

Allegro MicroSystems, LLC

3

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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