Overview
The ADXL278, specifically the AD22286-REEL model, is a fourth-generation surface micromachined iMEMS® accelerometer produced by Analog Devices Inc. This device is designed to provide a complete, dual-axis acceleration measurement system on a single monolithic IC. It is particularly suited for automotive applications, including front and side impact airbag systems, due to its temperature stability and accuracy over the automotive temperature range.
The ADXL278 features a fully differential sensor structure and circuit path, which offers high resistance to EMI/RFI effects. It also includes a self-test feature that exercises all mechanical and electrical elements of the sensor with a digital signal applied to a single pin.
Key Specifications
| Parameter | Conditions | Min | Typ | Max |
|---|---|---|---|---|
| Output Full-Scale Range | IOUT ≤ ±100 µA | ±70 g (X-axis), ±35 g (Y-axis) | ||
| Nonlinearity | 0.2% | 2% | ||
| Package Alignment Error | 1° | |||
| Sensor-to-Sensor Alignment Error | 0.1° | |||
| Cross-Axis Sensitivity | -5% | +5% | ||
| Resonant Frequency | 24 kHz | |||
| Sensitivity (Ratiometric) | VDD = 5 V, 100 Hz | 25.65 mV/g (X-axis), 52.25 mV/g (Y-axis) | 27 mV/g (X-axis), 55 mV/g (Y-axis) | 28.35 mV/g (X-axis), 57.75 mV/g (Y-axis) |
| Operating Temperature | -40°C | +105°C | ||
| Supply Voltage | 3 V | 6 V | ||
| Package Type | 8-Lead Ceramic Leadless Chip Carrier (LCC) |
Key Features
- Fully differential sensor structure and circuit path for high resistance to EMI/RFI effects.
- Complete mechanical and electrical self-test on digital command.
- Output ratiometric to supply voltage.
- Sensitive axes in the plane of the chip.
- High linearity of full scale.
- Frequency response down to dc.
- Low noise and low power consumption.
- Tight sensitivity tolerance and 0 g offset capability.
- Largest available prefilter clipping headroom.
- 400 Hz, 2-pole Bessel filter.
- Single-supply operation.
- Compatible with Sn/Pb and Pb-free solder processes.
- Qualified for automotive applications.
Applications
- Front and side impact airbag systems in automotive applications.
- Other automotive safety systems.
- Industrial and consumer applications requiring precise acceleration measurement.
- Vibration monitoring and analysis.
- Navigation and orientation systems.
Q & A
- What is the ADXL278 accelerometer used for?
The ADXL278 is used for dual-axis acceleration measurement, particularly in automotive applications such as front and side impact airbag systems.
- What is the operating temperature range of the ADXL278?
The operating temperature range is from -40°C to +105°C.
- What is the package type of the AD22286-REEL?
The package type is an 8-Lead Ceramic Leadless Chip Carrier (LCC).
- Does the ADXL278 have a self-test feature?
Yes, it has a complete mechanical and electrical self-test feature that can be initiated with a digital signal.
- What is the sensitivity of the ADXL278?
The sensitivity is ratiometric to the supply voltage, with typical values of 27 mV/g for the X-axis and 55 mV/g for the Y-axis at 5 V supply.
- Is the ADXL278 resistant to EMI/RFI?
Yes, it features a fully differential sensor structure and circuit path, providing high resistance to EMI/RFI effects.
- What is the resonant frequency of the ADXL278?
The resonant frequency is 24 kHz.
- Can the ADXL278 be used in non-automotive applications?
Yes, it can be used in various industrial and consumer applications requiring precise acceleration measurement.
- Is the ADXL278 compatible with Pb-free solder processes?
Yes, it is compatible with both Sn/Pb and Pb-free solder processes.
- What is the bandwidth of the ADXL278?
The bandwidth is from 0.5 Hz to 2.5 kHz.
