Packages:

TheATS468isatruezero-speedgeartoothsensorICconsisting

of an optimized Hall IC and a permanent magnet pellet

configuration in a single overmolded package. The integrated

circuit provides a manufacturer-friendly solution for digital

gear tooth sensing applications. This small package can be

easily assembled and used in conjunction with gears of various

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 a

ferromagnetic target. 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-

speedoperation.Signaloptimizationoccursatpower-onthrough

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 gear tooth–based speed, position, and timing

applications, such as in speedometers.

ATS468-DS

• Wide operating voltage range

• Peak detecting algorithm robust against signal

perturbations

• Capable of sensing a wide range of target types

• 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

Three-Wire True Zero-Speed Differential Peak-Detecting

Sensor IC with Continuous Calibration

Functional Block Diagram

Not to scale

ATS468

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

∑

4-Pin SIP (suffix SJ)

4-Pin SIP (suffix SG)

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FEATURES AND BENEFITS

DESCRIPTION

Limited Distribution

Allegro Confidential