ATS610LSC

DYNAMIC, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT

GEAR-TOOTH SENSOR

DEVICE DESCRIPTION — Continued

Peak-Detecting vs. AC-Coupled Filters. High-pass

filtering (normal ac coupling) is a commonly used tech-

nique for eliminating circuit offsets. AC coupling has

errors at power up because the filter circuit needs to hold

the circuit zero value even though the circuit may power

up over a large signal. Such filter techniques can only

perform properly after the filter has been allowed to settle,

which is typically greater than one second. Also, high-

pass filter solutions cannot easily track rapidly changing

baselines such as those caused by eccentricities. Peak

detection switches on the change in slope of the signal

and is baseline independent at power up and during

running.

Track-and-Hold Peak Detecting vs. Zero-Crossing

Reference. The usual differential zero-crossing sensors

are susceptible to false switching due to off-center and

tilted installations, which result in a shift in baseline that

changes with air gap. The track-and-hold peak-detection

technique ignores baseline shifts versus air gaps and

provides increased immunity to false switching. In addi-

tion, using track-and-hold peak-detecting techniques,

increased air gap capabilities can be expected because a

peak detector utilizes the entire peak-to-peak signal range

as compared to zero-crossing detectors that switch on

fixed thresholds.

NOTE — “Baseline” refers to the zero-gauss differen-

tial where each Hall-effect element is subject to the

same magnetic field strength.

CRITERIA FOR DEVICE QUALIFICATION

All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To

become qualified, except for the destructive ESD tests, no failures are permitted.

Test Method and

Samples

Qualification Test

Test Conditions

Test Length

Per Lot

Comments

Temperature Humidity

JESD22-A101,

1000 hrs

48

Device biased for

Bias Life

minimum power

Bias Life

JESD22-A108,

1000 hrs

48

(Surge Operating Life)

JESD22-A108,

168 hrs

48

Autoclave, Unbiased

JESD22-A102,

96 hrs

48

High-Temperature

JESD22-A103,

1000 hrs

48

(Bake) Storage Life

Temperature Cycle

JESD22-A104

1000 cycles

60

-55

°C to +150°C

ESD,

CDF-AEC-Q100-002

Pre/Post

3 per

Test to failure

Human Body Model

Reading

test

All leads > 8 kV