DRV411 Sensor Signal Conditioning IC


TI's DRV411 is designed to condition InSb Hall elements for use in closed-loop current-sensor modules

Texas Instruments' DRV411 is designed to condition InSb Hall elements for use in closed-loop current-sensor modules. The DRV411 provides precision excitation circuitry for the Hall element, effectively eliminating the offset and offset-drift of the Hall element. This device also provides a 250 mA H-bridge for driving the sensor compensation coil, as well as a precision differential amplifier to generate the output signal. The 250 mA drive capability of the H-bridge roughly doubles the current measurement range compared to conventional single-ended drive methods.

The Hall sensor front-end circuit and the differential amplifier employ proprietary offset cancelling techniques. These techniques, along with a high-accuracy voltage reference, significantly improve the accuracy of the overall current-sensor module. The output-voltage is pin-selectable to support a 2.5 V output for use with a 5 V power supply, as well as 1.65 V for 3.3 V sensors.

For optimum heat dissipation, the DRV411 is available in thermally-enhanced 4 × 4 mm QFN and TSSOP-20 with PowerPAD packages. The DRV411 is specified for operation over the full extended industrial temperature range of –40°C to +125°C.

Features
  • Optimized for symmetric Hall elements
    (AKM HW-322, HW-302, or similar)
  • Spinning-current Hall sensor excitation
    • Elimination of Hall sensor offset and drift
    • Elimination of 1/f noise
  • Extended current-measurement range
    • H-bridge drive capability: 250 mA
  • Over-range and error flags
 
  • Precision difference amplifier:
    • Offset and drift: 100 µV (max), 2 µV/°C (max)
    • System bandwidth: 200 kHz
  • Precision reference
    • Accuracy: 0.2% (max)
    • Drift: 50 ppm/°C (max)
    • Pin-selectable for 2.5 V, 1.65 V, and ratiometric mode

DRV411 Sensor Signal Conditioning IC

Manufacturer Part Number Description Available Quantity Datasheets
DRV411AIPWP IC SENSOR SIGNAL COND 20HTSSOP 178

Evaluation Board

Manufacturer Part Number Description Available Quantity Datasheets
DRV411EVM EVAL BOARD FOR DRV411 1