Two-Wire True Zero-Speed Miniature Differential
Peak-Detecting Sensor IC with Continuous Calibration
A1642
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS (continued) T
A
and V
CC
within speci cation, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ.
1
Max. Units
SWITCHPOINT CHARACTERISTICS
Operating Speed
f
OP
0 8,000 Hz
Analog Signal Bandwidth
BW Equivalent to f 3 dB
20 40 kHz
Operate Point
B
OP
Transitioning from I
CC(High)
to I
CC(Low)
; positive peak
referenced; AG < AG
MAX
120 mV
Release Point
B
RP
Transitioning from I
CC(Low)
to I
CC(High)
; negative peak
referenced; AG < AG
MAX
120 mV
CALIBRATION
Initial Calibration
C
I
Quantity of rising output (current) edges required for
accurate edge detection
3 Edge
DAC CHARACTERISTICS
Allowable User-Induced Differential
Offset
Operating within speci cation
?0 G
FUNCTIONAL CHARACTERISTICS
6
Operating Signal Range
7
Sig Operating within speci cation
30 1000 G
Minimum Operating Signal
Sig
OP(min)
Output switching (no missed edges); DC not
guaranteed
20 G
1
Typical values are at T
A
= 25癈 and V
CC
= 12 V. Performance may vary for individual units, within the speci ed maximum and minimum limits.
2
Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
3
Please refer to Device Operation section.
4
Power-On Time includes the time required to complete the internal automatic offset adjust. The DAC is then ready for peak acquisition.
5
dI is the difference between 10% of I
CC(Low)
and 90% of I
CC(High)
, and dt is the time period between those two points.
Note: dI/dt is dependent upon the value of the bypass capacitor, if one is used.
6
Functional characteristics valid only if magnetic offset is within the speci ed range for Allowable User Induced Differential Offset.
7
In order to remain in speci cation, the magnetic gradient must induce an operating signal greater than the minimum value speci ed. This includes the
effect of target wobble.
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