Overview
The DRV411AIRGPR from Texas Instruments is a comprehensive sensor signal conditioning IC designed for closed-loop magnetic current sensors. This device integrates all necessary functions for sensor operation, including magnetic field probe (Hall sensor) excitation, signal conditioning, and compensation-coil driver amplification. It operates from a single supply voltage of 2.7 V to 5.5 V and is optimized for use with symmetric Hall elements such as the AKM HW-322 and HW-302. The DRV411 ensures high precision and accuracy by eliminating Hall sensor offset and drift, and it features a 250-mA H-bridge for driving the sensor compensation coil and a precision differential amplifier for output signal generation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Hall Sensor Excitation Voltage (VEX) | 0.6 | 0.8 | 0.95 | V |
| Hall Sensor Excitation Current (IEX) | 10 | mA | ||
| Excitation Switching Frequency (fspin) | 1 | MHz | ||
| Front-end Open-loop Flatband Gain (AOLFB) | 250 | V/V | ||
| Output Voltage Noise Density (en) | 170 | nV/√Hz | ||
| Compensation Coil Driver Peak Current | 210 | 250 | mA | |
| Voltage Reference Accuracy | 0.2% | % | ||
| Supply Voltage (VDD) | 2.7 | 5.5 | V | |
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- Optimized for symmetric Hall-elements, such as AKM HW-322 and HW-302.
- Spinning current Hall sensor excitation to eliminate offset and drift.
- Extended current measurement range due to 250-mA H-bridge drive capability.
- Precision differential amplifier with offset and drift of 100 µV (max), 2 µV/°C (max).
- Precision voltage reference with accuracy of 0.2% (max) and drift of 50 ppm/°C (max).
- Pin-selectable output voltage for 2.5 V, 1.65 V, and ratiometric mode.
- Overrange and error flags for monitoring.
- Thermally enhanced 4-mm × 4-mm QFN and TSSOP-20 PowerPAD packages.
Applications
- Closed-loop current-sensor modules.
- DC and AC current measurement.
Q & A
- What is the operating voltage range of the DRV411? The DRV411 operates from a single supply voltage of 2.7 V to 5.5 V.
- What type of Hall elements is the DRV411 optimized for? The DRV411 is optimized for symmetric InSb Hall elements, such as the AKM HW-322 and HW-302.
- What is the peak current capability of the compensation coil driver? The compensation coil driver has a peak current capability of 250 mA.
- What is the accuracy of the voltage reference in the DRV411? The voltage reference has an accuracy of 0.2% (max) and a drift of 50 ppm/°C (max).
- What are the available package options for the DRV411? The DRV411 is available in thermally enhanced 4-mm × 4-mm QFN and TSSOP-20 PowerPAD packages.
- What is the operating temperature range of the DRV411? The DRV411 operates over the extended industrial temperature range of –40°C to +125°C.
- How does the DRV411 handle Hall sensor offset and drift? The DRV411 eliminates Hall sensor offset and drift through spinning current Hall sensor excitation.
- What is the system bandwidth of the DRV411? The system bandwidth of the DRV411 is 200 kHz.
- Does the DRV411 have overrange and error indicators? Yes, the DRV411 includes overrange and error flags for monitoring.
- What is the quiescent current of the DRV411? The quiescent current of the DRV411 is 6 mA.
