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. Its small package facilitates integration with various target shapes and sizes. The IC features dual Hall-effect elements with 2.2 mm spacing and signal processing that responds to differential magnetic signals from ring-magnet poles. It incorporates sophisticated digital circuitry for offset reduction, gain calibration for air-gap-independent switch points, and true zero-speed operation. Signal optimization occurs at power-on and is maintained through running-mode calibration, providing immunity to environmental variations. The A1468 is ideal for speed, position, and timing applications, such as in speedometers, and is available in a 4-pin SIP (suffix K) package. The package is lead (Pb) free with 100% matte-tin leadframe plating.
Product Attributes
- Brand: Allegro MicroSystems
- Package Type: 4-pin SIP (suffix K)
- Lead Material: Lead (Pb) free
- Lead Plating: 100% matte-tin
- Certifications: Not explicitly mentioned, but lead-free designation implies compliance with relevant environmental standards.
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
| ELECTRICAL CHARACTERISTICS | ||||||
| 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 CHARACTERISTICS | ||||||
| Power-On State | POS | VOUT, connected as in Figure 6 | High | V | ||
| Power-On Time | tPO | VCC > VCC(min) | 2.3 | ms | ||
| TRANSIENT PROTECTION CHARACTERISTICS | ||||||
| Supply Zener Clamp Voltage | VZ(supply) | ICC = ICC(max) + 3 mA, TA = 25 C | 38 | V | ||
| Supply Zener Current | IZ(supply) | Vsupply = 38 V | ICC(max) + 3 mA | |||
| Reverse Supply Current | IRCC | VRCC = 18 V, TJ < TJ(max) | 1 | mA | ||
| Output Zener Clamp Voltage | VZ(output) | IOUT = 3 mA, TA = 25C | 28 | V | ||
| Output Zener Current | IZ(output) | VOUT = 28 V | 3 | mA | ||
| Output Current Limit | IOUT(lim) | 30 | 85 | mA | ||
| OUTPUT STAGE CHARACTERISTICS | ||||||
| Output Saturation Voltage | VOUT(sat) | IOUT(sink) = 20 mA | 220 | 400 | mV | |
| Output Leakage Current | IOFF | VOUT = 24 V, output off | 10 | A | ||
| Output Fall Time | tf | RPU = 1 k, VPU = 20 V, COUT = 10 pF | 2 | s | ||
| PERFORMANCE CHARACTERISTICS | ||||||
| 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 | ||
| Operate Point | BOP | See Figure 5 | 3 | 10 | G | |
| Release Point | BRP | See Figure 5 | 120 | mV | ||
| Release Point | BRP | See Figure 5 | 3 | 10 | G | |
| 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 | ||
| THERMAL CHARACTERISTICS | ||||||
| Package Thermal Resistance | RJA | On single-layer PCB with copper limited to solder pads | 177 | C/W | ||
2201180730_ALLEGRO-A1468LK-T_C1526855.pdf
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