Product Overview
The A1468 is an optimized Hall-effect sensing IC designed for digital ring-magnet sensing and ferromagnetic target sensing in three-wire applications. It features dual Hall-effect elements with integrated signal processing for switching based on differential magnetic signals. The device offers user-friendly solutions with features like running-mode calibration for continuous optimization, automatic gain control (AGC) for air-gap independent switch points, and automatic offset adjustment (AOA) for signal processing optimization, ensuring true zero-speed operation. Its compact package is suitable for various target shapes and sizes, making it ideal for speed, position, and timing applications such as in speedometers.
Product Attributes
- Brand: Allegro MicroSystems
- Package Type: 4-pin SIP (suffix K)
- Lead Plating: 100% matte-tin leadframe plating
- Lead-Free: Yes
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | Operating, TJ 165C | 4 | 26.5 | V | |
| Undervoltage Lockout | VCC(uv) | VCC = 0 VCC(min) + 1 V and VCC(min) + 1 V 0 V | VCC(min) | V | ||
| Supply Current | ICC | VCC > VCC(min) | 3.0 | 5.0 | 7.5 | mA |
| Power-On Time | tPO | VCC > VCC(min) | 2.3 | ms | ||
| Operating Magnetic Signal Range | BDIFF | Peak-to-peak of differential signal; operation within specification | 20 | 1200 | G | |
| Operate Point | BOP | See Figure 5 | 120 | mV | ||
| Release Point | BRP | See Figure 5 | 120 | mV | ||
| Operating Frequency | fOP | 0 | 10 | kHz | ||
| Analog Signal Bandwidth | BW | Equivalent to f = 3 dB | 20 | kHz | ||
| Initial Calibration Cycle | ncal | Output rising edges before calibration is completed, 0 offset, fOP 200 Hz | 3 | edge | ||
| Output Duty Cycle Precision | DOUT | Using a pure sine magnetic signal, with fOP and BDIFF within specification | 15 | % | ||
| Output Period Precision | TOUT | Using pure sine magnetic signal with BDIFF = 50 Gpk-pk and fOP = 1 kHz | 0.3 | % | ||
| Allowable User-Induced Differential Offset | BDIFFEXT | Output switching only | 100 | G | ||
| Package Thermal Resistance | RJA | On single-layer PCB with copper limited to solder pads | 177 | C/W |
Package Dimensions (Figure 8):
4-Pin SIP (Suffix K)
- E1/E2 Hall Element Spacing: 2.2 mm
- Overall Dimensions: Refer to Figure 8 for detailed measurements.
Absolute Maximum Ratings:
| Characteristic | Symbol | Rating | Unit |
|---|---|---|---|
| Forward Supply Voltage | VCC | 38 | V |
| Reverse Supply Voltage | VRCC | 18 | V |
| Output Current | IOUT | 30 | mA |
| Reverse Output Current | IROUT | 50 | mA |
| Reverse Output Voltage | VROUT | 0.5 | V |
| Output Off Voltage | VOUT | 28 | V |
| Operating Ambient Temperature | TA | 40 to 150 | C |
| Maximum Junction Temperature | TJ(max) | 165 | C |
| Storage Temperature | Tstg | 65 to 170 | C |
Terminal List:
| Number | Name | Function |
|---|---|---|
| 1 | VCC | Supply voltage |
| 2 | VOUT | Output |
| 3 | TEST | Test pin, float |
| 4 | GND | Ground |
Selection Guide:
| Part Number | Package | Packing | Operating Ambient Temperature Range, TA (C) |
|---|---|---|---|
| A1468LK-T | 4-pin through hole SIP | Bulk, 500 pieces per bag | -40 to 150 |
2504101957_ALLEGRO-A1468LK-W-T_C5542455.pdf
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