Data Sheet
ADAF1080
Integrated 8 mT AMR Magnetic Field Sensor and Signal Conditioner
FEATURES
FUNCTIONAL BLOCK DIAGRAM
► Single-axis, high-precision, AMR magnetic field sensor
► Maximum magnetic field strength on the sense field axis for
linear operation up to ±8 mT
► Output noise (noise density magnetic field equivalent): 6
nT/√Hz
► >100 dB dynamic range
► Flip coil to calibrate electrical offset over life and temperature
► Temperature compensated output
► Integrated precision instrumentation amplifier
► Up to 2.2 MHz bandwidth at gain = 20
► Programmable chopping for precision measurements
► Synchronization features for wide bandwidth applications
► Ratiometric output capability to improve PSRR
► Programmable gain for 1.8 V to 5 V ADC range
► Analog output optimized to drive ADC
► Ease of use features
► Wide and user-selectable output common-mode voltage
► Integrated electrical offset cancellation
► Integrated diagnostics
► Temperature range: –40°C to +125°C
► Supply voltage range: 4.5 V to 5.5 V
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.
► Available in a 20-Lead LFCSP with an exposed pad
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.
APPLICATIONS
► Isolated and contactless current sensing
► Handheld current clamp meters
► Motor control current sense
► AC and DC power applications
► Precision magnetic field sensing applications
► Precision linear encoders
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.
► Low-noise, precision magnetometers
PRODUCT HIGHLIGHTS
The ADAF1080 is available in a 20-lead LFCSP with an exposed
pad.
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
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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