In industrial-grade sensing applications, engineers care not only about sensitivity and measurement range but also about long-term stability under temperature fluctuations, electromagnetic interference, and continuous operation. The ADXL355BEZ from Analog Devices is a digital, three-axis accelerometer designed specifically for such demanding environments. Featuring low noise, high linearity, and excellent temperature stability, it delivers reliable acceleration measurements for structural monitoring, industrial vibration analysis, medical sensing, and high-end IoT systems.
Product Overview and Technical Value
The ADXL355BEZ is built on a capacitive MEMS sensing architecture and integrates a 20-bit sigma-delta (Σ-Δ) ADC along with a programmable digital filter to provide precise, digitalized acceleration output. With SPI and I²C interfaces, it connects directly to microcontrollers or embedded processors, simplifying system design and minimizing analog signal noise.
Compared with traditional analog-output accelerometers, the ADXL355BEZ offers several key advantages:
- Low noise performance: Typical noise density of 25 µg/√Hz enables detection of subtle vibrations.
- Excellent thermal stability: Zero-g bias temperature coefficient as low as ±0.15 mg/°C.
- Selectable measurement ranges:±2 g, ±4 g, or ±8 g options for flexible system design.
- High-resolution digital output:20-bit ADC combined with digital filtering for enhanced precision.
- Industrial reliability: Wide operating temperature range from −40 °C to +125 °C, suitable for harsh environments.
Key Technical Specifications
Measurement Axes | X, Y, Z (three-axis) |
Output Interface | SPI / I²C |
Measurement Range | ±2.048 g / ±4.096 g / ±8.192 g |
Noise Density | 25 µg/√Hz (typical) |
Output Data Rate | 3.9 Hz to 4 kHz |
Supply Voltage | 2.25 V to 3.6 V |
Power Consumption | ~200 µA in measurement mode |
Package | 14-CLCC (6 × 6 × 2.1 mm) |
Typical Application Areas
- Structural Health Monitoring: Suitable for bridges, tunnels, and high-rise structures to detect low-frequency vibrations and dynamic responses.
- Industrial Equipment Condition Monitoring: Mounted on motors, pumps, or compressors for vibration analysis, enabling predictive maintenance.
- Medical and Wearable Devices: Low noise and low power consumption support medical-grade applications such as posture tracking and tremor detection.
- Platform Stabilization and Attitude Control: Serves as a key element in IMUs for gimbals, UAVs, and optical systems requiring precise motion correction.
Design and Integration Guidelines
- Power Supply: Use a low-noise LDO regulator with 0.1 µF and 1 µF decoupling capacitors on VSUPPLY, V1P8ANA, and V1P8DIG pins.
- Interface Selection: SPI is recommended for high-speed sampling; I²C is suitable for low-power applications.
- PCB Layout: Place the sensor near the system’s center of gravity and away from high-frequency or heat-generating components.
- Filter Configuration: Adjust the digital low-pass filter according to the target bandwidth to prevent aliasing.
- Compatibility: Pin-compatible with the ADXL354 analog series, allowing seamless migration to a fully digital design.
The ADXL355BEZ combines high resolution, low noise, and excellent temperature stability to deliver a mature and reliable solution for precision three-axis acceleration measurement. Whether used for structural safety monitoring, industrial vibration analysis, or embedded IMU modules, it offers stable long-term performance and secure supply availability. For designers transitioning from analog sensors such as the ADXL354 to digital architectures, the ADXL355BEZ provides an ideal balance of performance, reliability, and design simplicity.
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