ATS643LSH datasheet(4/16 Pages) ALLEGRO

4 / 16 page

ATS643-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Self-Calibrating, Zero-Speed Differential GTS with Continuous Update

ATS643LSH

OPERATING CHARACTERISTICS (continued) using reference target 60-0, TA and VCC within specification, unless otherwise noted

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

SWITCHPOINT CHARACTERISTICS

Rotation Speed

SROT

Reference Target 60-0

–

12,000

rpm

Bandwidth

Equivalent to f – 3dB

–

kHz

Operate Point

BOP

% of peak to peak referenced from PDAC to NDAC,

AG < AGMAX

–65–

Release Point

BRP

% of peak to peak referenced from PDAC to NDAC,

AG < AGMAX

–35–

CALIBRATION3

Initial Calibration Period

Quantity of rising output (current) edges required for

accurate edge detection

–

Edge

AGC Calibration Disable

Quantity of rising output (current) edges used for

calibrating AGC

–

Edge

Start Mode Hysteresis

POHYS

–

175

–

DAC CHARACTERISTICS

Dynamic Offset Cancellation

–

±60

–

Tracking Data Resolution

Quantity of bits available for PDAC/NDAC tracking of

both positive and negative signal peaks

–9–

Bit

FUNCTIONAL CHARACTERISTICS

Air Gap Range4

∆DC within specification

0.5

–

2.5

Maximum Operable Air Gap

AG(opmax)

Output switching (no missed edges); ∆DC not

guaranteed

–

2.75

Duty Cycle Variation

∆DC

Wobble < 0.5 mm, AG within specification

–

±10

Input Signal Range

Sig

∆DC within specification

–

1400

Minimum Operable Input Signal

Sig(opmin)

Output switching (no missed edges); ∆DC not

guaranteed

–

1Power-On Time includes the time required to complete the internal automatic offset adjust. The DACs are then ready for peak acquisition.

2dI is the difference between 10% of ICC(Low) and 90% of ICC(High) , and dt is time period between those two points. Note: dI/dt is dependent upon the value

of the bypass capacitor, if one is used.

3Continuous Update (calibration) functions continuously during Running mode operation.

4AG is dependent on the available magnetic field. The available field is dependent on target geometry and material, and should be independently

characterized. The field available from the reference target is given in the reference target parameter section of the datasheet.

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