DRV425 Datasheet, PDF (1/37 Pages) Texas Instruments – DRV425 Fluxgate Magnetic-Field Sensor

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DRV425 Fluxgate Magnetic-Field Sensor
DRV425
SBOS729 – OCTOBER 2015
1 Features
•1 High-Precision, Integrated Fluxgate Sensor:
– Offset: ±8 µT (Max)
– Offset Drift: ±5 nT/°C (Typ)
– Gain Error: 0.04% (Typ)
– Gain Drift: ±7 ppm/°C (Typ)
– Linearity: ±0.1%
– Noise: 1.5 nT/√Hz (Typ)
• Sensor Range: ±2 mT (Max)
– Range and Gain Adjustable with External
Resistor
• Selectable Bandwidth: 47 kHz or 32 kHz
• Precision Reference:
– Accuracy: 2% (max), Drift: 50 ppm/°C (max)
– Pin-Selectable Voltage: 2.5 V or 1.65 V
– Selectable Ratiometric Mode: VDD / 2
• Diagnostic Features: Overrange and Error Flags
• Supply Voltage Range: 3.0 V to 5.5 V
2 Applications
• Linear Position Sensing
• Current Sensing in Busbars
• Over-the-Trace Current Sensing
• General-Purpose Magnetic-Field Sensors
3 Description
The DRV425 is designed for single-axis magnetic
field-sensing applications and enables electrically-
isolated, high-sensitivity, and precise dc- and ac-field
measurements. The device provides the unique and
proprietary, integrated fluxgate sensor (IFG) with an
internal compensation coil to support a high-accuracy
sensing range of ±2 mT with a measurement
bandwidth of up to 47 kHz. The low offset, offset drift,
and noise of the sensor, combined with the precise
gain, low gain drift, and very low nonlinearity provided
by the internal compensation coil, result in unrivaled
magnetic field measurement precision. The output of
the DRV425 is an analog signal proportional to the
sensed magnetic field.
The DRV425 offers a complete set of features,
including an internal difference amplifier, on-chip
precision reference, and diagnostic functions to
minimize component count and system-level cost.
The DRV425 is available in a thermally-enhanced,
non-magnetic, thin WQFN package with a
PowerPAD™ for optimized heat dissipation, and is
specified for operation over the extended industrial
temperature range of –40°C to +125°C.
Device Information ⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DRV425
WQFN (20)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
COMP1
DRV425
COMP2
DRV2
Fluxgate
Sensor
and
Compensation
Coil
Differential
Driver
Integrator
Fluxgate Sensor Front-End
RSHUNT
DRV1 AINP
AINN
Shunt
Sense
Amplifier
VOUT
REFIN
ADC
Device Control and Diagnostic
Reference
REFOUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.