DRV411

DRV411 www.ti.com SBOS693B – AUGUST 2013 – REVISED DECEMBER 2013 Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensors Check for Samples: DRV411 FEATURES 1 23 Optimized for Symmetric Hall-Elements (for example, 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 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 Overrange and Error Flags Supply: 2.7 V to 5.5 V Packages: 4-mm × 4-mm QFN and TSSOP-20 PowerPAD™ Temperature Range: –40°C to +125°C DESCRIPTION The 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 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 tech...