Analog Devices Inc. ADXL1004BCPZ

Overview

ADXL1004BCPZ from Analog Devices is a single-axis, in-plane MEMS accelerometer with analog output, optimized for high-bandwidth vibration diagnostics in bearing fault detection. It delivers ±500 g full-scale range, 24 kHz 3 dB bandwidth, 125 µg/√Hz noise density, and operates from −40°C to +125°C in a 5 mm × 5 mm LFCSP package - enabling precision condition monitoring in industrial rotating equipment.

For engineers reviewing the ADXL1004BCPZ datasheet, ADXL1004BCPZ pinout, ADXL1004BCPZ application, or ADXL1004BCPZ equivalent, key selection criteria include its ultralow noise floor, ratiometric 4 mV/g sensitivity, fast <50 µs standby recovery, self-test capability, and overrange detection - all critical for embedded predictive maintenance systems requiring signal integrity beyond 10 kHz.

Technical Context

The ADXL1004BCPZ integrates a polysilicon surface-micromachined proof mass suspended by springs, with differential capacitors transducing acceleration into voltage via phase-sensitive demodulation. Its analog output is ratiometric to VDD (3.0 V to 5.25 V), ensuring consistent scaling across supply variations while maintaining 0 g offset at VDD/2.

It features two operating modes: continuous measurement mode (1.0 mA typical supply current) and standby mode (225 µA typical), with sub-50 µs wake-up latency. The internal 200 kHz clock couples spurious tones onto XOUT, requiring external filtering above 10 kHz - especially when targeting 24 kHz bandwidth or leveraging the 70 kHz small-signal amplifier bandwidth.

Key Specifications

Pinout & Package

ADXL1004BCPZ uses a 32-lead, 5 mm × 5 mm × 1.80 mm LFCSP package with exposed thermal pad (EPAD) requiring connection to ground for electrical stability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL1004BCPZ, ADXL1005BCPZ trades noise performance for extended bandwidth, while PCB 352C33 offers superior high-frequency fidelity but lacks integration, power efficiency, and ruggedized packaging - making ADXL1004BCPZ the optimal balance for autonomous industrial edge sensing.

Availability

ADXL1004BCPZ is available at Aetrix Electronics and suitable for condition monitoring, predictive maintenance, and acoustic emission sensing requiring stable component supply across automotive, industrial, and aerospace production programs.

Supply support for ADXL1004BCPZ 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, communications, and automotive markets since 1965.

The ADXL1004BCPZ belongs to Analog Devices' high-bandwidth MEMS accelerometer product line, designed specifically for machine health monitoring systems requiring ultralow noise, wide dynamic range, and robust operation in harsh thermal environments.

FAQ

What is the maximum usable bandwidth of ADXL1004BCPZ in practical applications?

The ADXL1004BCPZ has a specified 3 dB bandwidth of 24 kHz, but its usable bandwidth depends on application constraints. For accurate amplitude measurement, operation below 10 kHz avoids resonance-related nonlinearity. Above 10 kHz, external filtering and ≥220 kHz sampling are required to suppress aliasing from the 70 kHz amplifier bandwidth and 200 kHz internal clock spur. In bearing diagnostics, 15–22 kHz is commonly used to balance signal fidelity and noise rejection.

How does the ratiometric output of ADXL1004BCPZ affect system calibration?

The ADXL1004BCPZ output voltage and zero-g offset are both ratiometric to VDD, meaning sensitivity is 4 mV/g × (VDD/5.0 V) and 0 g output is VDD/2. When the downstream ADC uses the same VDD as its reference voltage, supply-induced gain and offset errors cancel - eliminating need for per-unit calibration. If separate references are used, regulator tolerance and drift directly impact measurement accuracy and require compensation.

Can ADXL1004BCPZ operate reliably at +125°C continuously?

Yes, ADXL1004BCPZ is fully specified and guaranteed for continuous operation from −40°C to +125°C. Its MEMS structure, signal conditioning circuitry, and LFCSP packaging are qualified for this range, with sensitivity stability within ±5% and noise performance maintained. Thermal design must ensure junction temperature stays within limits - proper EPAD grounding and PCB copper area are essential for heat dissipation at maximum ambient.

What is the purpose of the OR (Overrange) pin on ADXL1004BCPZ?

The OR pin on ADXL1004BCPZ is an open-drain output that asserts low during detected overrange events (>1000 g, or ~2× full-scale). It is not latched and pulses for ~200 µs per event, with periodic rechecking every ~500 µs during sustained overload. This allows host systems to log mechanical shock events or trigger protective shutdowns without interrupting normal measurement - and the internal clock disable protects the MEMS element during extreme excitation.

Does ADXL1004BCPZ require external components for basic operation?

For basic operation, ADXL1004BCPZ requires only a 1 µF ceramic decoupling capacitor on VDD and proper grounding of the EPAD. No external resistors or filters are needed if driving loads ≤100 pF and operating below 10 kHz. However, for capacitive loads ≥100 pF, an 8 kΩ series resistor is mandatory to maintain amplifier stability; for bandwidths >10 kHz, external RC filtering and high-speed ADC sampling (≥220 kHz) are required to manage aliasing and clock coupling.