PACKAGE: 4-PIN SIP (SUFFIX K)

TheA1468 is an optimized Hall effect sensing IC that provides

a user-friendly solution for digital ring-magnet sensing, or

when coupled with a magnet, ferromagnetic target sensing,

in three-wire applications. The small device package can be

easily assembled into applications for use in conjunction with

a wide variety of target shapes and sizes.

The integrated circuit incorporates dual Hall effect elements

with a 2.2 mm spacing and signal processing that switches

in response to differential magnetic signals created by ring-

magnet poles. The circuitry contains a sophisticated digital

circuit to reduce system offsets, to calibrate the gain for air-

gap–independent switchpoints, and to achieve true zero-speed

operation. Signal optimization occurs at power-on through

the combination of offset and gain adjust, and is maintained

throughout the operating time with the use of a running-mode

calibration. The running-mode calibration provides immunity

toenvironmentaleffectssuchasmicro-oscillationsofthetarget

or sudden air gap changes.

The device is ideally suited to obtaining speed and duty cycle

information in ring-magnet–based speed, position, and timing

applications, such as in speedometers.

The A1468 is available in a 4-pin SIP (suffix K). The package

is lead (Pb) free, with 100% matte tin leadframe plating.

A1468-DS, Rev. 3

• 4.0 to 26.5 V supply operating range

• Running mode calibration for continuous optimization

• Single chip IC for high reliability

• Precise duty cycle signal throughout operating

temperature range

• Large operating air gaps

• Automatic Gain Control (AGC) for air-gap–independent

switchpoints

• Automatic Offset Adjustment (AOA) for signal

processing optimization

• True zero-speed operation

• Undervoltage lockout

• Reverse battery protection

• Scan and IDDQ for increased test coverage

Three-Wire True Zero-Speed Differential Peak-Detecting

Sensor IC with Continuous Calibration

Functional Block Diagram

Not to scale

A1468

Tracking DAC

AOA DAC

TEST

OUT

GND

VCC

Internal

Regulator

Test Signals

Automatic Offset

Adjustment (AOA)

Control

Peak Hold

Current

Limit

AGC DAC

Automatic Gain

Control (AGC)

Hall

Amplifier

E1

E2

Gain

∑

FEATURES AND BENEFITS

DESCRIPTION