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High Accuracy Analog Speed Sensor IC with Integrated
Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
11
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Target Selection
The zero-crossing switchpoints and AC-coupled operation of this
device make target selection important. For high-density target
geometries or small target features that produce a sinusoidal
magnetic signal, the high-pass  lter is capable of  ltering offsets
that may be induced in the  nal device output. If such offset is
present, and the target has larger features, then the high-pass
 lter may not be effective at higher speeds and an accuracy shift
may occur. These relationships are shown in  gure 2.
Power Supply Protection
The A1425 contains an on-chip voltage regulator and can oper-
ate over a wide supply voltage range. In applications that operate
the device from an unregulated power supply, transient protec-
tion must be added externally. For applications using a regulated
line, EMI/RFI protection may still be required. The circuit
shown in  gure 3 is the most basic con guration required for
proper device operation.
Applications Information
2
1
3
(Required)
4
V
OUT
0.1 uF
R
PU
VCC
A1425
Figure 3. Basic application circuit. A pull-up resistor, R
PU
, is required
with the output driver.
+B
+V
0
0
0
B
t
+B
Output Edge
Shift
+V
0
B
t
Valley
Large Feature (Tooth)
Figure 2. Large Feature Effects. (a) Large target feature but no device offset,
normal edge position. (b) Large target feature with negative device offset, shifted
(advanced) output edge position.
(a)
(b)
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