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High Accuracy Analog Speed Sensor IC with Integrated
Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
Rating Units
Package Thermal Resistance
R
窲A
Single-layer PCB, with copper limited to solder pads   177  篊/W
20   40   60   80   100   120   140   160   180
Temperature (篊)
Power Derating Curve
8
10
12
14
0
2
4
6
16
18
20
22
24
26
28
30
(R
窲A 
= 177 篊/W)
V
CC(min)
V
CC(max)
 
Temperature (癈)
20    40    60    80   100   120   140   160   180
Maximum Power Dissipation, P
D(max)
(
R
?/DIV>
J
A
 =
 
1
7
7
 
?/DIV>
C
/
W
)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
De nitions of Terms
The following provide additional information about some of
the parameters cited in the Operating Characteristics table.
For additional information, visit the Allegro Web site at
www.allegromicro.com.
Applied Magnetic Field, B
diff
  The differential magnetic  ux
density which is calculated as the arithmetic difference of the
 ux densities observed by each of the two Hall elements.
Output Off Switchpoint (Operate Point), B
OP
  The value of
increasing differential magnetic  ux density at which the device
output switches from low to high. This value may be greater than
or less than 0 G.
Output On Switchpoint (Release Point), B
RP
  The value of
decreasing differential magnetic  ux density at which the device
output switches from high to low. This value may be greater
than or less than 0 G.
Power-On Time, t
PO
  The time needed by the device, after
power is applied, to initialize all circuitry necessary for proper
operation.
Settling Time, t
Settle
  The time required by the device, after t
PO
,
and after a valid magnetic signal has been applied, to provide
proper output transitions. Settling time is a function of magnetic
offset, offset polarity, signal phase, signal frequency, and signal
amplitude.
Response Time t
Response
 The total time required for generat-
ing zero-crossing output transitions after power-up (the sum of
power-on time and settling time).
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