Analog Devices Inc. ADAF1080 Magnetic-Field Sensors

Analog Devices ADAF1080 Magnetic-Field Sensors combine integrated signal conditioning with an AMR sensor and a signal-conditioning amplifier. The single-axis, high-precision magnetic-field sensors provide electrical-offset cancellation capabilities, integrated diagnostics, and an analog-to-digital converter (ADC) driver for precisely measuring magnetic fields up to ±8mT.

The ADI ADAF1080 sensor features two die within one package, an AMR sensor, and an application-specific IC (ASIC). The device has a precision amplified output signal 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 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 using an integrated diagnostic coil to measure the system’s gain or detect a magnetic saturation event.

The ADAF1080 is housed in a 20-lead LFCSP with an exposed pad.

Features

Single-axis, high-precision, AMR magnetic field sensor
- Maximum magnetic field strength on the sense field axis for linear operation up to ±8mT
- 6nT/√Hz output noise (noise density magnetic field equivalent)
- >100dB dynamic range
- Flip coil to calibrate electrical offset over life and temperature
- Temperature-compensated output
Integrated precision instrumentation amplifier
- Up to 2.2MHz bandwidth at gain = 20
- Programmable chopping for precision measurements
- Synchronization features for wide bandwidth applications
- Ratiometric output capability to improve PSRR
- Programmable gain for 1.8V to 5V ADC range
- Analog output optimized to drive ADC

Ease of use features
- Wide, user-selectable output common-mode voltage
- Integrated electrical offset cancellation
- Integrated diagnostics
Temperature range of -40°C to +125°C
4.5V to 5.5V supply voltage range
Available in a 20-Lead LFCSP with an exposed pad

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
Low-noise, precision magnetometers

Analog Devices Inc. ADAF1080 Magnetic-Field Sensors

Features

Applications

Block Diagram

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