Analog Devices Inc. ADXL1002BCPZ-RL

Overview

ADXL1002BCPZ-RL from Analog Devices is a single-axis, high-frequency MEMS accelerometer with analog output, optimized for industrial condition monitoring. It delivers ±50 g full-scale range, 25 µg/√Hz noise density, 11 kHz 3 dB bandwidth, and operates from −40°C to +125°C in a 5 mm × 5 mm × 1.80 mm LFCSP package - enabling precise vibration measurement in bearing health and rotating equipment diagnostics.

For engineers reviewing the ADXL1002BCPZ-RL datasheet, ADXL1002BCPZ-RL pinout, ADXL1002BCPZ-RL application, or ADXL1002BCPZ-RL equivalent, key selection criteria include its ratiometric 40 mV/g sensitivity, <50 µs standby-to-measure recovery, overrange detection (OR) output, self-test (ST) capability, and compatibility with high-bandwidth signal chains up to 10 kHz.

Technical Context

The ADXL1002BCPZ-RL implements a polysilicon surface-micromachined proof mass suspended by springs, with differential capacitive sensing and phase-sensitive demodulation to produce a voltage output proportional to acceleration. Its mechanical resonant frequency is 21 kHz, and its small-signal amplifier bandwidth extends to 70 kHz - supporting accurate measurement beyond the 11 kHz 3 dB point when properly filtered.

It operates in two modes: continuous measurement mode (1.0 mA typical supply current) and standby mode (225 µA typical), with <50 µs wake-up time. The output is ratiometric to VDD (3.0 V to 5.25 V), and includes dedicated ST (self-test input), STANDBY (active-high control), and OR (open-drain overrange indicator) pins for embedded system integration.

Key Specifications

Pinout & Package

ADXL1002BCPZ-RL uses a 33-pin 5 mm × 5 mm × 1.80 mm LFCSP package with exposed EPAD (pin 33) requiring connection to ground for thermal and electrical performance. Pin functions are validated per Analog Devices Rev. A datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency MEMS accelerometer applications.

Compared with ADXL1001BCPZ-RL, the ADXL1002BCPZ-RL provides lower noise for fine-resolution spectral analysis, while compared with PCB 352C33, it enables simplified, dc-coupled, single-supply integration without external signal conditioning - reducing BOM count and layout complexity.

Availability

ADXL1002BCPZ-RL is available at Aetrix Electronics and suitable for condition monitoring, predictive maintenance, and test & measurement applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADXL1002BCPZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing, power management, and connectivity.

The ADXL100x product line was designed specifically for industrial machine health monitoring, delivering ultralow-noise, high-bandwidth MEMS accelerometers with integrated self-test and overrange detection to replace legacy piezoelectric sensors in embedded systems.

FAQ

What is the full-scale measurement range of the ADXL1002BCPZ-RL?

The ADXL1002BCPZ-RL has a full-scale measurement range of ±50 g. This range is factory-trimmed and stable over temperature (±5% sensitivity variation from −40°C to +125°C). It is optimized for high-frequency vibration monitoring where dynamic range must accommodate both steady-state operation and transient shocks without saturation - such as in electric motor stators or centrifugal pump impellers. The ADXL1002BCPZ-RL achieves this with 25 µg/√Hz noise density, ensuring resolution remains effective across the entire ±50 g span.

How does the ratiometric output of the ADXL1002BCPZ-RL affect system design?

Both the sensitivity (40 mV/g) and zero-g offset (VDD/2) of the ADXL1002BCPZ-RL scale proportionally with the supply voltage VDD (3.0 V to 5.25 V). This ratiometric behavior means that if the downstream ADC uses the same VDD as its reference voltage, supply-induced gain and offset errors cancel - significantly improving measurement accuracy without trimming. For example, at 4.5 V supply, sensitivity becomes 36 mV/g and zero-g output shifts to 2.25 V. Designers must ensure stable, well-decoupled VDD and avoid sharing noisy digital rails; the ADXL1002BCPZ-RL datasheet recommends a 1 µF ceramic capacitor at the VDD pin.

What is the purpose and behavior of the OR (Overrange) pin on the ADXL1002BCPZ-RL?

The OR pin on the ADXL1002BCPZ-RL is an open-drain output that asserts low when acceleration exceeds approximately ±100 g - twice the ±50 g full-scale range. It is not latched and responds within nanoseconds to overrange events. During detection, the internal 200 kHz clock is disabled for 200 µs to protect the MEMS element. If overrange persists, the OR pin pulses every ~500 µs. This pin enables real-time firmware intervention - for example, triggering high-sample-rate capture, logging context data, or initiating safe shutdown - without requiring continuous host polling of the analog output. Its behavior is fully documented in the ADXL1002BCPZ-RL datasheet Section "Overrange".

Can the ADXL1002BCPZ-RL operate from a 3.3 V supply, and how does that impact performance?

Yes, the ADXL1002BCPZ-RL operates from 3.0 V to 5.25 V, including standard 3.3 V supplies. At 3.3 V, sensitivity scales to ~26.4 mV/g (40 mV/g × 3.3/5.0), zero-g output becomes 1.65 V, and noise density remains 25 µg/√Hz. Quiescent current increases slightly to ~1.1 mA (typical), and standby current rises to ~250 µA. The 11 kHz 3 dB bandwidth and linearity (±0.1%) are unaffected. However, drive capability decreases: maximum resistive load drops to ~1.65 kΩ (at 3.3 V, 2 mA max), and capacitive load handling requires stricter adherence to the 8 kΩ series resistor rule for >100 pF. System-level SNR may improve due to reduced supply noise coupling.

What mechanical mounting considerations are critical for achieving specified bandwidth with the ADXL1002BCPZ-RL?

To achieve the ADXL1002BCPZ-RL's specified 11 kHz bandwidth, mechanical mounting must preserve signal fidelity up to 21 kHz (resonant frequency). Key requirements include: mounting the device near a rigid PCB mounting point (not over cutouts or flex zones), using multiple through-hole or screw-down anchors, selecting a thick (≥1.6 mm), low-resonance PCB, and avoiding adhesive-only attachment above 1–2 kHz. For frequencies >5 kHz, stud-mounting with 10–32 thread is strongly recommended. Magnetic mounts are unsuitable above ~500 Hz. Improper mounting introduces spurious resonances that distort spectra - the ADXL1002BCPZ-RL datasheet shows incorrect placement causing >20 dB error at 3 kHz. Evaluation boards EVAL-ADXL1002Z follow these guidelines.