Data Sheet

ADAF1080

Integrated 8 mT AMR Magnetic Field Sensor and Signal Conditioner

Rev. 0

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FEATURES

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Single-axis, high-precision, AMR magnetic field sensor

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Maximum magnetic field strength on the sense field axis for

linear operation up to ±8 mT

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Output noise (noise density magnetic field equivalent): 6

nT/√Hz

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>100 dB dynamic range

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Flip coil to calibrate electrical offset over life and temperature

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Temperature compensated output

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Integrated precision instrumentation amplifier

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Up to 2.2 MHz bandwidth at gain = 20

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Programmable chopping for precision measurements

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Synchronization features for wide bandwidth applications

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Ratiometric output capability to improve PSRR

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Programmable gain for 1.8 V to 5 V ADC range

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Analog output optimized to drive ADC

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Ease of use features

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Wide and user-selectable output common-mode voltage

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Integrated electrical offset cancellation

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Integrated diagnostics

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Temperature range: –40°C to +125°C

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Supply voltage range: 4.5 V to 5.5 V

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Available in a 20-Lead LFCSP with an exposed pad

APPLICATIONS

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Isolated and contactless current sensing

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Handheld current clamp meters

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Motor control current sense

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AC and DC power applications

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Precision magnetic field sensing applications

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Precision linear encoders

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Low-noise, precision magnetometers

PRODUCT HIGHLIGHTS

1. Contactless current measurement

2. Precise measurement of magnetic field strength in a single axis

3. Low-noise analog front end

4. Negligible hysteresis

5. High-bandwidth, wide-range magnetic field sensor

6. Electrical offset cancellation over life and temperature

FUNCTIONAL BLOCK DIAGRAM

Figure 1. Functional Block Diagram

GENERAL DESCRIPTION

The ADAF1080 is a single-axis, high-precision, magnetic-field sen-

sor with integrated signal conditioning. The device incorporates an

anisotropic magnetoresistive (AMR) sensor with an integrated sig-

nal-conditioning amplifier, electrical-offset cancellation capabilities,

integrated diagnostics, and an analog-to-digital converter (ADC)

driver for precise measurement of magnetic fields up to ±8 mT.

The ADAF1080 consists of two die within one package, an AMR

sensor, and an application-specific IC (ASIC). The ADAF1080 pro-

vides a precision amplified output signal that is proportional to the

magnetic field strength along the sensitive axis of the sensor. The

output voltage is ratiometric to the supply voltage with a common

mode of half the voltage set on the external VSET input pin.

The magnetic orientation of the sensor can be defined through

the use of an integrated flip coil that can be used for electrical-

offset cancellation in the presence of a constant magnetic field.

Diagnostics can be carried out through the use of an integrated

diagnostic coil, which can measure the gain of the system or detect

a magnetic saturation event.

The ADAF1080 is available in a 20-lead LFCSP with an exposed

pad.