High Accuracy Analog Speed Sensor IC with Integrated
Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS Valid at T
A
= 40
?/DIV>
C to 150
?/DIV>
C, T
J
d 165癈; over operational air gap range and V
CC
within
operating range, unless otherwise noted. Typical operating parameters: V
CC
= 12 V and T
A
= 25癈.
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
V
CC
Operating; T
J
< T
J(max)
4.0 26.5 V
Supply Current
I
CC
4.2 7.0 mA
Output Saturation Voltage
V
OUT(SAT)
I
SINK
= 20 mA
140 400 mV
Output Leakage Current
I
OFF
V
OUT
= 24 V, B
diff
= 0
5 糀
PROTECTION COMPONENT CHARACTERISTICS
Reverse Supply Current
I
RCC
V
CC
= 18 V
1 mA
Supply Zener Current
I
ZSupply
V
S
= 28 V
10 mA
Supply Zener Clamp Voltage
1
V
ZSupply
I
CC
= 10 mA, T
A
= 25癈
28 33 37 V
Output Zener Current
I
ZOutput
V
OUT
= 28 V
3 mA
Output Zener Clamp Voltage
V
ZOutput
I
OUT
= 3 mA, T
A
= 25癈
28 V
Output Short Circuit Current Limit
2
I
OUTS(lim)
50 mA
RESPONSE CHARACTERISTICS
Power-On State
POS t < t
Response
High V
Power-On Time
3,7
t
PO
V
CC
> V
CC(min)
4.5 9 ms
Settling Time
4,7
t
Settle
f
Bdiff
e 100 Hz
0 50 ms
Response Time
7
t
Response
Equal to t
PO
+ t
S
;
f
Bdiff
e 100 Hz
4.5 59 ms
Upper Corner Frequency
f
cu
3 dB, single pole
20 kHz
Lower Corner Frequency
f
cl
3 dB, single pole
20 Hz
OUTPUT CHARACTERISTICS
Output Rise Time
5
t
r
R
PU
= 1 k? C
OUT2
= 10 pF
200 ns
Output Fall Time
t
f
R
PU
= 1 k? I
SINK
= 20 mA, C
OUT2
= 10 pF
200 ns
MAGNETIC CHARACTERISTICS
Output Off Switchpoint
6,7
B
OP
B
diff
increasing, f
Bdiff
= 200 Hz, B
diff
= 50 Gp-p;
digital output signal switches low to high
11 0 11 G
Output On Switchpoint
6,7
B
RP
B
diff
decreasing, f
Bdiff
= 200 Hz, B
diff
= 50 Gp-p;
digital output signal switches high to low
11 0 11 G
Applied Magnetic Field
7,8
B
diff
Differential p-p magnetic eld
50 1250 G
1
I
CC
equivalent to I
CC(max)
+ 3 mA.
2
I
OUT
does not change state when I
OUT
> I
OUTS(lim)
, regardless of changes in the impinging magnetic eld.
3
Time required to initialize device.
4
Time required for the output switchpoints to be within speci cation.
5
Output Rise Time will be dominated by the RC time constant.
6
For other sinusoidal signal frequencies and magnetic elds, B
OP
= B
RP
= sin?B
diff
D 2) ?25%, where ?is the phase shift shown in the Characteristic
Data section.
7
See De nitions of Terms section.
8
Exceeding the maximum magnetic eld may result in compromised absolute accuracy.
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