Analog Devices Inc. ADXL1005BCPZ

Overview

ADXL1005BCPZ from Analog Devices is a single-axis, in-plane MEMS accelerometer with analog output, ±100 g full-scale range, 75 μg/√Hz noise density, dc to 23 kHz linear frequency response, and 42 kHz resonant frequency-designed for high-fidelity bearing fault detection in industrial condition monitoring systems.

For engineers reviewing the ADXL1005BCPZ datasheet, ADXL1005BCPZ pinout, ADXL1005BCPZ application, or ADXL1005BCPZ equivalent, key selection criteria include ultralow noise performance at high bandwidth, ratiometric analog output stability over temperature, self-test and overrange detection functionality, and compatibility with wireless sensing platforms requiring low quiescent current (1.0 mA typical) and fast standby recovery (<50 μs).

Technical Context

The ADXL1005BCPZ employs a polysilicon surface-micromachined proof mass suspended by compliant springs, with differential capacitive sensing and phase-sensitive demodulation to convert mechanical acceleration into a ratiometric analog voltage. Its signal chain integrates electrostatic self-test actuation, overrange detection logic, and a low-impedance output amplifier capable of driving up to 22 nF capacitive loads with external series resistance.

It operates in two distinct modes: continuous measure mode (1.0 mA @ 5 V) and standby mode (225 μA @ 5 V), with sub-50 μs wake-up time. The internal 200 kHz clock enables precise timing control but introduces spurious tones requiring band-limiting filtering above 10 kHz to prevent aliasing in digitization.

Key Specifications

Pinout & Package

ADXL1005BCPZ is housed in a 32-lead, 5 mm × 5 mm × 1.8 mm LFCSP package with exposed thermal pad requiring solder connection to PCB ground plane for electrical integrity and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL1005BCPZ, ADXL1002BCPZ trades range and noise for cost efficiency in moderate-dynamic applications, while ADXL1003BCPZ extends overload capability without sacrificing noise or bandwidth-making ADXL1005BCPZ the optimal balance for bearing diagnostics where ±100 g and 75 μg/√Hz are simultaneously required.

Availability

ADXL1005BCPZ is available at Aetrix Electronics and suitable for condition monitoring, predictive maintenance, and acoustic emission sensing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADXL1005BCPZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADXL100x product line delivers ultralow-noise, wideband MEMS accelerometers optimized specifically for machine health diagnostics-emphasizing signal fidelity, temperature stability, and integrated self-test for unattended field deployment.

FAQ

What is the maximum measurable acceleration for ADXL1005BCPZ?

The ADXL1005BCPZ has a guaranteed full-scale range of ±100 g, meaning it accurately measures acceleration magnitudes up to 100 g in either direction along its sensitive x-axis. Mechanical shock survival is rated to 10,000 g per IEC 60068-2-27, but measurement linearity and specified noise performance apply only within the ±100 g range. Exceeding this causes clipping and invalidates the 75 μg/√Hz noise specification for ADXL1005BCPZ.

How does the ratiometric output of ADXL1005BCPZ affect system design?

The ADXL1005BCPZ output voltage scales directly with VDD: sensitivity is 20 mV/g × (VDD/5.0 V), and zero-g output is VDD/2. This means if the downstream ADC uses the same VDD as its reference voltage, supply-induced gain and offset errors cancel-eliminating need for precision regulators. For ADXL1005BCPZ, this ratiometric behavior simplifies power architecture and improves measurement consistency across varying supply conditions.

Can ADXL1005BCPZ be used beyond its 23 kHz 3 dB bandwidth?

Yes, ADXL1005BCPZ's output amplifier supports small-signal bandwidth up to 70 kHz, but usable measurement bandwidth is limited by sensor resonance at 42 kHz. Above 23 kHz, sensitivity increases due to peaking near resonance, introducing nonlinearity and requiring careful calibration. For reliable quantitative analysis, ADXL1005BCPZ is specified for linear operation dc to 23 kHz; operation beyond requires external anti-alias filtering and awareness of gain variation per Figure 4 in the ADXL1005BCPZ datasheet.

What is the purpose of the OR (Overrange) pin on ADXL1005BCPZ?

The OR pin on ADXL1005BCPZ is an open-drain or push-pull output that asserts instantly when sensed acceleration exceeds ±100 g. It is not latched-pulse duration matches overrange event duration-and serves as a hardware trigger for data capture, alarm generation, or system protection. Unlike the analog XOUT signal, OR provides deterministic timing for event-based response without signal conditioning, making it critical for ADXL1005BCPZ deployments in shock-prone industrial environments.

How does the self-test function work in ADXL1005BCPZ?

The ADXL1005BCPZ self-test applies electrostatic force to the proof mass via internal electrodes, inducing displacement equivalent to ~24.5 g acceleration (490 mV Δ at 5 V). Activated by driving ST pin high, it validates the entire signal path-including mechanical suspension, capacitive transduction, demodulation, and output amplification. Measured delta between normal and ST-active outputs must fall within 420–490 mV (ratiometric) per Table 1. This full-path check ensures ADXL1005BCPZ reliability in safety-critical or inaccessible installations.