ATS625LSGTN Allegro Microsystems Inc, ATS625LSGTN Datasheet - Page 13

• Manufacturer Part Number: ATS625LSGTN
• Description: IC SENSOR GEAR TOOTH 4-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS625LSGTN

• Sensing Range: 60% Trip, 40% Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 14mA
• Current - Output (max): 10mA
• Output Type: Digital, Open Collector
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ATS625LSG
AGC (Automatic Gain Control)
The AGC feature is implemented by a unique patented self-
calibrating circuitry. After each power-on, the device measures
the peak-to-peak magnetic signal. The gain of the circuit is then
Offset Adjustment
In addition to normalizing performance over varying AG, the
gain control circuitry also reduces the effect of chip, magnet,
and installation offsets. This is accomplished using two DACs
(D to A converters) that capture the peaks and valleys of the
Differential Electrical Signal versus Target Rotation
-1000
1000
-200
-400
-600
-800
800
600
400
200
0
Figure 7. Effect of AGC. The left panel shows the process signal, V
AGC. The result is a normalized V
0
at Various Air Gaps, Without AGC
3
6
Target Rotation (°)
9
0.25 mm
0.50 mm
1.00 mm
1.50 mm
2.00 mm
AG:
12
15
PROC
, which allows optimal performance by the rest of the circuits that reference this signal.
True Zero-Speed Low-Jitter High Accuracy
18
21
24
adjusted, keeping the internal signal amplitude constant over the
air gap range of the device, AG. This feature ensures that opera-
tional characteristics are isolated from the effects of changes in
AG. The effect of AGC is shown in figure 7.
Differential Electrical Signal versus Target Rotation
processed signal, V
old Comparator subcircuit, which controls device switching. If
induced offsets bias the absolute signal up or down, AGC and
the dynamic DAC behavior work to normalize and reduce the
impact of the offset on device performance.
PROC
-1000
1000
, without AGC. The right panel shows the effect with
-200
-400
-600
-800
800
600
400
200
0
0
at Various Air Gaps, With AGC
3
PROC
Gear Tooth Sensor IC
6
, and use it as a reference for the Thresh-
Target Rotation (°)
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
9
1.00 mm
1.50 mm
2.00 mm
AG:
0.25 mm
0.50 mm
12
15
18
21
24
13